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XCL205/XCL206/XCL207 Series
Inductor Built-in Step-Down "micro DC/DC" Converters
ETR2801-008
GreenOperation Compatible
GENERAL DESCRIPTION
The XCL205/XCL206/XCL207 series is a synchronous step-down micro DC/DC converter which integrates an inductor and a control IC in one tiny package (2.5mmx2.0mm, H=1.0mm). A stable power supply with an output current of 600mA is configured using only two capacitors connected externally. Operating voltage range is from 2.0V to 6.0V. Output voltage is internally set in a range from 0.8V to 4.0V in increments of 0.05V. The device is operated by 3.0MHz, and includes 0.42P-channel driver transistor and 0.52N-channel switching transistor. As for operation mode, the XCL205 series is PWM control, the XCL206 series is automatic PWM/PFM switching control and the XCL207 series can be manually switched between the PWM control mode and the automatic PWM/PFM switching control mode, allowing fast response, low ripple and high efficiency over the full range of loads (from light load to heavy load). During stand-by, the device is shutdown to reduce current consumption to as low as 1.0A or less. With the built-in UVLO (Under Voltage Lock Out) function, the internal driver transistor is forced OFF when input voltage becomes 1.4V or lower. XCL205B/XCL206B/XCL207B series provide short-time turn-on by the soft start function internally set in 0.25 ms (TYP). XCL205B(C) /XCL206 B(C) / XCL207B(C) integrate CL auto discharge function which enables the electric charge stored at the output capacitor CL to be discharged via the internal auto-discharge switch located between the LX and VSS pins. When the devices enter stand-by mode, output voltage quickly returns to the VSS level as a result of this function.
APPLICATIONS
Mobile phones, Smart phones Bluetooth Headsets WiMAX PDAs, MIDs, UMPCs Portable game consoles Digital cameras, Camcorders Electronic dictionaries
FEATURES
Ultra Small Input Voltage Output Voltage High Efficiency Output Current Oscillation Frequency Maximum Duty Cycle Capacitor CE Function : 2.5mmx2.0mm, H=1.0mm : 2.0V ~ 6.0V : 0.8V ~ 4.0V (+2.0%) : 90% (VIN=4.2V, VOUT=3.3V) : 600mA : 3.0MHz (+15%) : 100% : Low ESR Ceramic : Active High Soft-Start Circuit Built-In CL High Speed Auto Discharge :Current Limiter Circuit Built-In (Constant Current & Latching) : PWM (XCL205) PWM/PFM Auto (XCL206) PWM/PFM Manual (XCL207)
Protection Circuits Control Methods
* Performance depends on external components and wiring on the PCB.
TYPICAL APPLICATION CIRCUIT TYPICAL PERFORMANCE CHARACTERISTICS
XCL205/206/207 Series XCL205A333xx/XCL206A333xx/XCL207A333xx
100 80
VIN Vss CE/MODE L2 CIN 4.7F
XCL206/XCL207(PWM/PFM)
L1 LX CL 10F 600mA VOUT Vss
Efficency:EFFI(%)
60 40 20
VIN= 5.5V 5.0V 4.2V
XCL205/XCL207 (PWM) VOUT=3.3V
0
(TOP VIEW) * "L1 and LX", and "L2 and VOUT" is connected by wiring.
0.1
1
10
100
1000
Output Current:IOUT (mA)
1/26
XCL205/XCL206/XCL207 Series
PIN CONFIGURATION
L1 7 VIN 6 Vss 5 CE/MODE 4 8 L2 1 Lx 2 Vss 3 VOUT
* It should be connected the VSS pin (No. 2 and 5) to the GND pin. * If the dissipation pad needs to be connected to other pins, it should be connected to the GND pin. * Please refer to pattern layout page for the connecting to PCB.
(BOTTOM VIEW)
PIN ASSIGNMENT
PIN NUMBER
1 2,5 3 4 6 7 8
PIN NAME
Lx VSS VOUT CE / MODE VIN L1 L2
FUNCTION Switching Output Ground Output Voltage Chip Enable & Mode Switch Power Input
Inductor Electrodes
PRODUCT CLASSIFICATION
Ordering
Information
XCL205-(*1) Fixed PWM control XCL206-(*1) PWM / PFM automatic switching control XCL207-(*1) Manual Mode Selection Pin (Semi-custom) DESIGNATOR ITEM Functions selection (All CE active high) SYMBOL A B C 10 12 14 15 18 19 25 28 2L 30 33 3
AR-G
DESCRIPTION No CL auto discharge, Standard soft-start CL auto discharge, High speed soft-start CL auto discharge, Standard soft-start 1.0V 1.2V 1.4V 1.5V 1.8V 1.9V 2.5V 2.8V 2.85V 3.0V 3.3V 3.0MHz
CL-2025 (3,000Reel)
Output Voltage
(*2)
-(*1)
(*1) (*2)
Oscillation Frequency Package (Oder Unit)
The "-G" suffix indicates that the products are Halogen and Antimony free as well as being fully RoHS compliant. When other output voltages are needed, please contact your local Torex sales office for more information. Output voltage range is 0.8~4.0V.
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XCL205/XCL206/XCL207
Series
BLOCK DIAGRAM
XCL205A / XCL206A / XCL207A series
L2
Phase Compensation
Inductor
L1
Current Feedback Current Limit
VOUT
R2
CFB Error Amp. FB
Logic
PWM Comparator Synch Buffer Drive
R1
Lx
VIN
Vref with Soft Start, CE
VSHORT
PWM/PFM Selector
VSS
UVLO Cmp UVLO Ramp Wave Generator OSC
VSS
R3
R4
CE/MODE Control Logic
CE/MODE
NOTE: The XCL205 offers a fixed PWM control, a signal from CE/MODE Control Logic to PWM/PFM Selector is fixed to "L" level inside. The XCL206 control scheme is PWM/PFM automatic switching, a signal from CE/MODE Control Logic to PWM/PFM Selector is fixed to "H" level inside. The diodes placed inside are ESD protection diodes and parasitic diodes.
XCL205B / XCL206B / XCL207B / XCL205C / XCL206C / XCL207C series
L2
Phase Compensation
Inductor
L1
Current Feedback Current Limit
VOUT
R2
CFB Error Amp. FB
Logic
PWM Comparator Synch Buffer Drive
R1
Lx
VIN
Vref with Soft Start, CE
VSHORT
PWM/PFM Selector
VSS
UVLO Cmp Ramp Wave Generator OSC
CE/
VSS
UVLO
R3
R4
CE/MODE Control Logic
CE/MODE
NOTE: The XCL205 offers a fixed PWM control, a signal from CE/MODE Control Logic to PWM/PFM Selector is fixed to "L" level inside. The XCL206 control scheme is PWM/PFM automatic switching, a signal from CE/MODE Control Logic to PWM/PFM Selector is fixed to "H" level inside. The diodes placed inside are ESD protection diodes and parasitic diodes.
ABSOLUTE MAXIMUM RATINGS
Ta = 25
PARAMETER VIN Pin Voltage LX Pin Voltage VOUT Pin Voltage CE/MODE Pin Voltage LX Pin Current Power Dissipation Operating Temperature Range Storage Temperature Range
SYMBOL VIN VLX VOUT VCE ILX Pd Topr Tstg
RATINGS - 0.3 ~ 6.5 - 0.3 ~ VIN + 0.36.5 - 0.3 ~ 6.5 - 0.3 ~ 6.5 1500 1000*1 - 40 ~ + 85 - 40 ~ + 105
UNITS V V V V mA mW
*1: The power dissipation figure shown is PCB mounted (40mmx40mm, t=1.6mm, Glass Epoxy FR-4). Please refer to page 16 for details.
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XCL205/XCL206/XCL207 Series
ELECTRICAL CHARACTERISTICS
XCL205A123AR/XCL206A123AR/XCL207A123AR, VOUT=1.2V, fOSC=3.0MHz, Ta=25
PARAMETER Output Voltage Operating Voltage Range Maximum Output Current UVLO Voltage Supply Current (XCL205) Supply Current (XCL206, XCL207) Stand-by Current Oscillation Frequency PFM Switching Current PFM Duty Limit
(*12) (*12)
SYMBOL VOUT VIN IOUTMAX VUVLO IDD ISTB fOSC IPFM DTYLIMIT_PFM DMAX DMIN EFFI RLH RLH RLL RLL ILeakH ILeakL ILIM VOUT/ (VOUTtopr) VCEH VCEL
(*13)
CONDITIONS When connected to external components, VIN=VCE=5.0V, IOUT=30mA VIN=VOUT(T)+2.0V, VCE=1.0V (*9) When connected to external components VCE=VIN,VOUT=0V, (*1, *11) Voltage which Lx pin holding "L" level VIN=VCE=5.0V, VOUT=VOUT(T)x1.1V VIN=5.0V, VCE=0V, VOUT=VOUT(T)x1.1V When connected to external components, VIN=VOUT(T)+2.0V,VCE=1.0V, IOUT=100mA When connected to external components, (*12) VIN=VOUT(T)+2.0V, VCE=VIN , IOUT=1mA VCE= VIN=(C-1) IOUT=1mA
(*12)
MIN. 1.176 2.0 600 1.00 2550 190 100 900 0.65 VSS VIN 0.25 - 0.1 - 0.1 0.5 1.0 0.450 -
TYP. 1.200 1.40 46 21 0 3000 260 200 82 0.35 0.42 0.45 0.52 0.01 0.01 1050 100 -
MAX. 1.224 6.0 1.78 65 35 1.0 3450 350 300 0 0.55 0.67 0.66 0.77 1.0 1.0 1350 VIN 0.25 VIN - 1.0
UNITS CIRCUIT V V mA V A A kHz mA % % % % A A mA ppm/ V V V
Maximum Duty Cycle Minimum Duty Cycle Efficiency Lx SW "H" ON Resistance 1 Lx SW "H" ON Resistance 2 Lx SW "L" ON Resistance 1 Lx SW "L" ON Resistance 2 (*5) Lx SW "H" Leak Current (*5) Lx SW "L" Leak Current (*10) Current Limit Output Voltage Temperature Characteristics CE "H" Voltage CE "L" Voltage PWM "H" Level Voltage
VIN=VCE=5.0V, VOUT=VOUT (T)x0.9V VIN=VCE=5.0V, VOUT=VOUT (T)x1.1V When connected to external components, VCE=VINVOUT (T)+1.2V, IOUT = 100mA (*3) VIN=VCE=5.0V, VOUT=0V, ILX=100mA (*3) VIN=VCE=3.6V, VOUT=0V, ILX=100mA (*4) VIN=VCE=5.0V (*4) VIN=VCE=3.6V, VIN=VOUT=5.0V, VCE=0V, LX=0V VIN=VOUT=5.0V, VCE=0V, LX= 5.0V (*8) VIN=VCE=5.0V, VOUT=VOUT (E)x0.9V IOUT =30mA -40Topr85 VOUT=0V, Applied voltage to VCE, (*11) Voltage changes Lx to "H" level VOUT=0V, Applied voltage to VCE, (*11) Voltage changes Lx to "L" level When connected to external components, (*6), IOUT=1mA Voltage which oscillation (*13) frequency becomes 2550kHzfOSC3450kHz When connected to external components, (*6) IOUT=1mA , Voltage which oscillation (*13) frequency becomes fOSC2550kHz VIN=VCE=5.0V, VOUT=0V VIN=5.0V, VCE=0V, VOUT=0V When connected to external components, VCE=0VVIN , IOUT=1mA VIN=VCE=5.0V, VOUT=0.8xVOUT(T) (*7) Short Lx at 1 resistance Sweeping VOUT, VIN=VCE=5.0V, Short Lx at 1 resistance, VOUT voltage which Lx becomes "L" level within 1ms Test frequency=1MHz T=40
VPWMH
PWM "L" Level Voltage CE "H" Current CE "L" Current Soft Start Time Latch Time Short Protection Threshold Voltage
(*13)
VPWML ICEH ICEL tSS tLAT VSHORT L IDC
0.9 0.600 1.5 1000
0.1 0.1 2.5 20 0.750 -
V A A ms ms V H mA

Inductance Value Allowed Inductor Current
4/26
Test conditions: Unless otherwise stated, VIN=5.0V, VOUT (T)=Nominal Voltage NOTE: *1: Including hysteresis operating voltage range. *2: EFFI = { ( output voltagexoutput current ) / ( input voltagexinput current) }x100 *3: ON resistance ()= (VIN - Lx pin measurement voltage) / 100mA *4: Design value *5: When temperature is high, a current of approximately 10A (maximum) may leak. *6: The CE/MODE pin of the XCL207 series works also as an external switching pin of PWM control and PWM/PFM control. When the IC is in the operation, control is switched to the automatic PWM/PFM switching mode when the CE/MODE pin voltage is equal to or greater than VIN minus 0.3V, and to the PWM mode when the CE/MODE pin voltage is equal to or lower than VIN minus 1.0V and equal to or greater than VCEH. *7: Time until it short-circuits VOUT with GND via 1of resistor from an operational state and is set to Lx=0V from current limit pulse generating. *8: When VIN is less than 2.4V, limit current may not be reached because voltage falls caused by ON resistance. *9: When the difference between the input and the output is small, some cycles may be skipped completely before current maximizes. If current is further pulled from this state, output voltage will decrease because of P-ch driver ON resistance. *10: Current limit denotes the level of detection at peak of coil current. *11: "H"=VIN~VIN-1.2V, "L"=+0.1V~-0.1V *12: IPFM and DTYLIMIT_PFM are defined only for the XCL206 and XCL207 series which have PFM control function. (Not for the XCL 205 series) *13: VPWMH and VPWML are defined only for the XCL207 series. (They are not used in the XCL205/and XCL206 series)
XCL205/XCL206/XCL207
Series
ELECTRICAL CHARACTERISTICS (Continued)
XCL205A183AR/XCL206A183AR/XCL207A183AR, VOUT=1.8V, fOSC=3.0MHz, Ta=25
PARAMETER Output Voltage Operating Voltage Range Maximum Output Current UVLO Voltage Supply Current (XCL205) Supply Current (XCL206, XCL207) Stand-by Current Oscillation Frequency PFM Switching Current PFM Duty Limit
(*12) (*12)
SYMBOL VOUT VIN IOUTMAX VUVLO IDD ISTB fOSC IPFM DTYLIMIT_PFM DMAX DMIN EFFI RLH RLH RLL RLL ILeakH ILeakL ILIM VOUT/ (VOUTtopr) VCEH VCEL
CONDITIONS When connected to external components, VIN=VCE=5.0V, IOUT=30mA VIN=VOUT(E)+2.0V, VCE=1.0V (*9) When connected to external components VCE=VIN,VOUT=0V, (*1, *11) Voltage which Lx pin holding "L" level VIN=VCE=5.0V, VOUT=VOUT(T)x1.1V VIN=5.0V, VCE=0V, VOUT=VOUT(T)x1.1V When connected to external components, VIN=VOUT(T)+2.0V,VCE=1.0V, IOUT=100mA When connected to external components, (*12) VIN=VOUT(T)+2.0V, VCE=VIN , IOUT=1mA VCE= VIN=(C-1) IOUT=1mA
(*12)
MIN. 1.764 2.0 600 1.00 2550 170 100 900 0.65 VSS
TYP. 1.800 1.40 46 21 0 3000 220 200 85 0.35 0.42 0.45 0.52 0.01 0.01 1050 100 -
MAX. 1.836 6.0 1.78 65 35 1.0 3450 270 300 0 0.55 0.67 0.66 0.77 1.0 1.0 1350 VIN 0.25
UNITS CIRCUIT V V mA V A A kHz mA % % % % A A mA ppm/ V V
Maximum Duty Cycle Minimum Duty Cycle Efficiency Lx SW "H" ON Resistance 1 Lx SW "H" ON Resistance 2 Lx SW "L" ON Resistance 1 Lx SW "L" ON Resistance 2 (*5) Lx SW "H" Leak Current (*5) Lx SW "L" Leak Current (*10) Current Limit Output Voltage Temperature Characteristics CE "H" Voltage CE "L" Voltage
VIN=VCE=5.0V, VOUT=VOUT (T)x0.9V VIN=VCE=5.0V, VOUT=VOUT (T)x1.1V When connected to external components, VCE=VINVOUT (T)+1.2V, IOUT = 100mA (*3) VIN=VCE=5.0V, VOUT=0V, ILX=100mA (*3) VIN=VCE=3.6V, VOUT=0V, ILX=100mA (*4) VIN=VCE=5.0V (*4) VIN=VCE=3.6V, VIN=VOUT=5.0V, VCE=0V, LX=0V VIN=VOUT=5.0V, VCE=0V, LX= 5.0V (*8) VIN=VCE=5.0V, VOUT=VOUT (E)x0.9V IOUT =30mA -40Topr85 VOUT=0V, Applied voltage to VCE, (*11) Voltage changes Lx to "H" level VOUT=0V, Applied voltage to VCE, (*11) Voltage changes Lx to "L" level When connected to external components, (*6), Voltage which oscillation IOUT=1mA (*13) frequency becomes 2550kHzfOSC3450kHz When connected to external components, (*6) IOUT=1mA , Voltage which oscillation (*13) frequency becomes fOSC2550kHz VIN=VCE=5.0V, VOUT=0V VIN=5.0V, VCE=0V, VOUT=0V When connected to external components, VCE=0VVIN , IOUT=1mA VIN=VCE=5.0V, VOUT=0.8xVOUT(T) (*7) Short Lx at 1 resistance Sweeping VOUT, VIN=VCE=5.0V, Short Lx at 1 resistance, VOUT voltage which Lx becomes "L" level within 1ms Test frequency =1MHz T=40
PWM "H" Level Voltage
(*13)
VPWMH
-
-
VIN - 1.0
V
PWM "L" Level Voltage CE "H" Current CE "L" Current Soft Start Time Latch Time Short Protection Threshold Voltage
(*13)
VPWML ICEH ICEL tSS tLAT VSHORT L IDC
VIN 0.25 - 0.1 - 0.1 0.5 1.0 0.675 -
0.9 0.900 1.5 1000
0.1 0.1 2.5 20 1.125 -
V A A ms ms V H mA

Inductance Value Allowed Inductor Current
Test conditions: Unless otherwise stated, VIN=5.0V, VOUT (T)=Nominal Voltage NOTE: *1: Including hysteresis operating voltage range. *2: EFFI = { ( output voltagexoutput current ) / ( input voltagexinput current) }x100 *3: ON resistance ()= (VIN - Lx pin measurement voltage) / 100mA *4: Design value *5: When temperature is high, a current of approximately 10A (maximum) may leak. *6: The CE/MODE pin of the XCL207 series works also as an external switching pin of PWM control and PWM/PFM control. When the IC is in the operation, control is switched to the automatic PWM/PFM switching mode when the CE/MODE pin voltage is equal to or greater than VIN minus 0.3V, and to the PWM mode when the CE/MODE pin voltage is equal to or lower than VIN minus 1.0V and equal to or greater than VCEH. *7: Time until it short-circuits VOUT with GND via 1of resistor from an operational state and is set to Lx=0V from current limit pulse generating. *8: When VIN is less than 2.4V, limit current may not be reached because voltage falls caused by ON resistance. *9: When the difference between the input and the output is small, some cycles may be skipped completely before current maximizes. If current is further pulled from this state, output voltage will decrease because of P-ch driver ON resistance. *10: Current limit denotes the level of detection at peak of coil current. *11: "H"=VIN~VIN-1.2V, "L"=+0.1V~-0.1V *12: IPFM and DTYLIMIT_PFM are defined only for the XCL206 and XCL207 series which have PFM control function. (Not for the XCL 205 series) *13: VPWMH and VPWML are defined only for the XCL207 series. (They are not used in the XCL205/and XCL206 series)
5/26
XCL205/XCL206/XCL207 Series
ELECTRICAL CHARACTERISTICS (Continued)
XCL205B123AR/XCL206B123AR/ XCL207B123AR, VOUT=1.2V, fOSC=3.0MHz, Ta=25
PARAMETER Output Voltage Operating Voltage Range Maximum Output Current UVLO Voltage Supply Current (XCL205) Supply Current (XCL206, XCL207) Stand-by Current Oscillation Frequency PFM Switching Current PFM Duty Limit
(*12) (*12)
SYMBOL VOUT VIN IOUTMAX VUVLO IDD ISTB fOSC IPFM DTYLIMIT_PFM DMAX DMIN EFFI RLH RLH RLL RLL ILeakH ILIM VOUT/ (VOUTtopr) VCEH VCEL
(*13)
CONDITIONS When connected to external components, VIN=VCE=5.0V, IOUT=30mA VIN=VOUT(T)+2.0V, VCE=1.0V (*9) When connected to external components VCE=VIN,VOUT=0V, (*1, *11) Voltage which Lx pin holding "L" level VIN=VCE=5.0V, VOUT=VOUT(T)x1.1V VIN=5.0V, VCE=0V, VOUT=VOUT(T)x1.1V When connected to external components, VIN =VOUT(T)+2.0V,VCE=1.0V, IOUT=100mA When connected to external components, (*12) VIN =VOUT(T)+2.0V, VCE = VIN , IOUT=1mA VCE=VIN=(C-1) IOUT=1mA
(*12)
MIN. 1.176 2.0 600 1.00 2550 190 100 900 0.65 VSS VIN 0.25 - 0.1 - 0.1 1.0 0.450 200 -
TYP. 1.200 1.40 46 21 0 3000 260 200 82 0.35 0.42 0.45 0.52 0.01 1050 100 0.25 0.600 300 1.5 1000
MAX. 1.224 6.0 1.78 65 35 1.0 3450 350 300 0 0.55 0.67 0.66 0.77 1.0 1350 VIN 0.25 VIN - 1.0 0.1 0.1 0.40 20 0.750 450 -
UNITS CIRCUIT V V mA V A A kHz mA % % % % A mA ppm/ V V V V A A ms ms V H mA
Maximum Duty Cycle Minimum Duty Cycle Efficiency Lx SW "H" ON Resistance 1 Lx SW "H" ON Resistance 2 Lx SW "L" ON Resistance 1 Lx SW "L" ON Resistance 2 (*5) Lx SW "H" Leak Current (*10) Current Limit Output Voltage Temperature Characteristics CE "H" Voltage CE "L" Voltage PWM "H" Level Voltage PWM "L" Level Voltage CE "H" Current CE "L" Current Soft Start Time Latch Time Short Protection Threshold Voltage CL Discharge Inductance Value Allowed Inductor Current
VIN=VCE=5.0V, VOUT=VOUT (T)x0.9V VIN=VCE=5.0V, VOUT=VOUT (T)x1.1V When connected to external components, VCE=VINVOUT (T)+1.2V, IOUT=100mA (*3) VIN=VCE=5.0V, VOUT=0V, ILX=100mA (*3) VIN=VCE=3.6V, VOUT=0V, ILX=100mA (*4) VIN=VCE=5.0V (*4) VIN=VCE = 3.6V VIN=VOUT=5.0V, VCE =0V, LX=0V (*8) VIN=VCE=5.0V, VOUT=VOUT (T)x0.9V IOUT =30mA -40Topr85 VOUT=0V, Applied voltage to VCE, (*11) Voltage changes Lx to "H" level VOUT=0V, Applied voltage to VCE, (*11) Voltage changes Lx to "L" level When connected to external components, (*6), IOUT=1mA Voltage which oscillation (*13) frequency becomes 2550kHzfOSC3450kHz When connected to external components, (*6) IOUT=1mA , Voltage which oscillation (*13) frequency becomes fOSC2550kHz VIN=VCE=5.0V, VOUT=0V VIN=5.0V, VCE=0V, VOUT=0V When connected to external components, VCE=0VVIN , IOUT=1mA VIN=VCE=5.0V, VOUT=0.8xVOUT(T) (*7) Short Lx at 1 resistance Sweeping VOUT, VIN=VCE=5.0V, Short Lx at 1 resistance, VOUT voltage which Lx becomes "L" level within 1ms VIN=5.0V, LX=5.0V, VCE=0V, VOUT=Open Test frequency =1MHz T=40
VPWMH VPWML ICEH ICEL tSS tLAT VSHORT RDCHG L IDC
(*13)
Test conditions: Unless otherwise stated, VIN=5.0V, VOUT (T) =Nominal Voltage NOTE: *1: Including hysteresis operating voltage range. *2: EFFI = { ( output voltagexoutput current ) / ( input voltagexinput current) }x100 *3: ON resistance ()= (VIN - Lx pin measurement voltage) / 100mA *4: Design value *5: When temperature is high, a current of approximately 10A (maximum) may leak. *6: The CE/MODE pin of the XCL207 series works also as an external switching pin of PWM control and PWM/PFM control. When the IC is in the operation, control is switched to the automatic PWM/PFM switching mode when the CE/MODE pin voltage is equal to or greater than VIN minus 0.3V, and to the PWM mode when the CE/MODE pin voltage is equal to or lower than VIN minus 1.0V and equal to or greater than VCEH. *7: Time until it short-circuits VOUT with GND via 1of resistor from an operational state and is set to Lx=0V from current limit pulse generating. *8: When VIN is less than 2.4V, limit current may not be reached because voltage falls caused by ON resistance. *9: When the difference between the input and the output is small, some cycles may be skipped completely before current maximizes. If current is further pulled from this state, output voltage will decrease because of P-ch driver ON resistance. *10: Current limit denotes the level of detection at peak of coil current. *11: "H"=VIN~VIN-1.2V, "L"=+0.1V~-0.1V *12: IPFM and DTYLIMIT_PFM are defined only for the XCL206 and XCL207 series which have PFM control function. (Not for the XCL 205 series) *13: VPWMH and VPWML are defined only for the XCL207 series. (They are not used in the XCL205/and XCL206 series)
6/26
XCL205/XCL206/XCL207
Series
ELECTRICAL CHARACTERISTICS (Continued)
XCL205 B183AR/XCL206 B183AR/ XCL207B183AR, VOUT=1.8V, fOSC=3.0MHz, Ta=25
PARAMETER Output Voltage Operating Voltage Range Maximum Output Current UVLO Voltage Supply Current (XCL205) Supply Current (XCL206, XCL207) Stand-by Current Oscillation Frequency PFM Switching Current PFM Duty Limit
(*12) (*12)
SYMBOL VOUT VIN IOUTMAX VUVLO IDD ISTB fOSC IPFM DTYLIMIT_PFM DMAX DMIN EFFI RLH RLH RLL RLL ILeakH ILIM VOUT / (VOUTtopr) VCEH VCEL
(*13)
CONDITIONS When connected to external components, VIN=VCE=5.0V, IOUT=30mA VIN=VOUT(E)+2.0V, VCE=1.0V (*9) When connected to external components VCE=VIN,VOUT=0V, (*1, *11) Voltage which Lx pin holding "L" level VIN=VCE=5.0V, VOUT=VOUT(T)x1.1V VIN=5.0V, VCE=0V, VOUT=VOUT(T)x1.1V When connected to external components, VIN =VOUT(T)+2.0V,VCE=1.0V, IOUT=100mA When connected to external components, (*12) VIN =VOUT(T)+2.0V, VCE = VIN , IOUT=1mA VCE=VIN=(C-1) IOUT=1mA
(*12)
MIN. 1.764 2.0 600 1.00 2550 170 100 900 0.65 VSS VIN 0.25 - 0.1 - 0.1 1.0 0.675 200 -
TYP. 1.800 1.40 46 21 0 3000 220 200 85 0.35 0.42 0.45 0.52 0.01 1050 100 0.32 0.900 300 1.5 1000
MAX. 1.836 6.0 1.78 65 35 1.0 3450 270 300 0 0.55 0.67 0.66 0.77 1.0 1350 VIN 0.25 VIN - 1.0 0.1 0.1 0.50 20 1.125 450 -
UNITS CIRCUIT V V mA V A A kHz mA % % % % A mA ppm/ V V V V A A ms ms V H mA
Maximum Duty Cycle Minimum Duty Cycle Efficiency Lx SW "H" ON Resistance 1 Lx SW "H" ON Resistance 2 Lx SW "L" ON Resistance 1 Lx SW "L" ON Resistance 2 (*5) Lx SW "H" Leak Current (*10) Current Limit Output Voltage Temperature Characteristics CE "H" Voltage CE "L" Voltage PWM "H" Level Voltage PWM "L" Level Voltage CE "H" Current CE "L" Current Soft Start Time Latch Time Short Protection Threshold Voltage CL Discharge Inductance Value Allowed Inductor Current
VIN=VCE=5.0V, VOUT=VOUT (T)x0.9V VIN=VCE=5.0V, VOUT=VOUT (T)x1.1V When connected to external components, VCE=VINVOUT (T)+1.2V, IOUT=100mA (*3) VIN=VCE=5.0V, VOUT=0V, ILX=100mA (*3) VIN=VCE=3.6V, VOUT=0V, ILX=100mA (*4) VIN=VCE=5.0V (*4) VIN=VCE = 3.6V VIN=VOUT=5.0V, VCE =0V, LX=0V (*8) VIN=VCE=5.0V, VOUT=VOUT (T)x0.9V IOUT =30mA -40Topr85 VOUT=0V, Applied voltage to VCE, (*11) Voltage changes Lx to "H" level VOUT=0V, Applied voltage to VCE, (*11) Voltage changes Lx to "L" level When connected to external components, (*6), IOUT=1mA Voltage which oscillation (*13) frequency becomes 2550kHzfOSC3450kHz When connected to external components, (*6) IOUT=1mA , Voltage which oscillation (*13) frequency becomes fOSC2550kHz VIN=VCE=5.0V, VOUT=0V VIN=5.0V, VCE=0V, VOUT=0V When connected to external components, VCE=0VVIN , IOUT=1mA VIN=VCE=5.0V, VOUT=0.8xVOUT(T) (*7) Short Lx at 1 resistance Sweeping VOUT, VIN=VCE=5.0V, Short Lx at 1 resistance, VOUT voltage which Lx becomes "L" level within 1ms VIN=5.0V, LX=5.0V, VCE=0V, VOUT=Open Test frequency =1MHz T=40
VPWMH VPWML ICEH ICEL tSS tLAT VSHORT RDCHG L IDC
(*13)
Test conditions: Unless otherwise stated, VIN=5.0V, VOUT (T) = Nominal Voltage NOTE: *1: Including hysteresis operating voltage range. *2: EFFI = { ( output voltagexoutput current ) / ( input voltagexinput current) }x100 *3: ON resistance ()= (VIN - Lx pin measurement voltage) / 100mA *4: Design value *5: When temperature is high, a current of approximately 10A (maximum) may leak. *6: The CE/MODE pin of the XCL207 series works also as an external switching pin of PWM control and PWM/PFM control. When the IC is in the operation, control is switched to the automatic PWM/PFM switching mode when the CE/MODE pin voltage is equal to or greater than VIN minus 0.3V, and to the PWM mode when the CE/MODE pin voltage is equal to or lower than VIN minus 1.0V and equal to or greater than VCEH. *7: Time until it short-circuits VOUT with GND via 1of resistor from an operational state and is set to Lx=0V from current limit pulse generating. *8: When VIN is less than 2.4V, limit current may not be reached because voltage falls caused by ON resistance. *9: When the difference between the input and the output is small, some cycles may be skipped completely before current maximizes. If current is further pulled from this state, output voltage will decrease because of P-ch driver ON resistance. *10: Current limit denotes the level of detection at peak of coil current. *11: "H"=VIN~VIN-1.2V, "L"=+0.1V~-0.1V *12: IPFM and DTYLIMIT_PFM are defined only for the XCL206 and XCL207 series which have PFM control function. (Not for the XCL 205 series) *13: VPWMH and VPWML are defined only for the XCL207 series. (They are not used in the XCL205/and XCL206 series)
7/26
XCL205/XCL206/XCL207 Series
ELECTRICAL CHARACTERISTICS (Continued)
XCL205C123AR/XCL206C123AR/ XCL207C123AR, VOUT=1.2V, fOSC=3.0MHz, Ta=25
PARAMETER Output Voltage Operating Voltage Range Maximum Output Current UVLO Voltage Supply Current (XCL205) Supply Current (XCL206, XCL207) Stand-by Current Oscillation Frequency PFM Switching Current PFM Duty Limit
(*12) (*12)
SYMBOL VOUT VIN IOUTMAX VUVLO IDD ISTB fOSC IPFM DTYLIMIT_PFM MAXDTY MINDTY EFFI RLH RLH RLL RLL ILeakH ILIM VOUT/ (VOUTtopr) VCEH VCEL
(*13)
CONDITIONS When connected to external components, VIN = VCE =5.0V, IOUT =30mA VIN=VOUT(E)+2.0V, VCE=1.0V (*9) When connected to external components VCE=VIN,VOUT=0V, (*1, *11) Voltage which Lx pin holding "L" level VIN =VCE=5.0V, VOUT= VOUT(T)x1.1V VIN =5.0V, VCE=0V, VOUT= VOUT(T)x1.1V When connected to external components, VIN =VOUT(T)+2.0V,VCE=1.0V, IOUT=100mA When connected to external components, VIN =VOUT(T)+2.0V, VCE = VIN , IOUT=1mA VCE= VIN =(C-1) IOUT=1mA VIN = VCE =5.0V, VOUT = VOUT (T)x0.9V VIN = VCE =5.0V, VOUT = VOUT (T)x1.1V When connected to external components, VCE = VIN VOUT (T)+1.2V, IOUT = 100mA (*3) VIN = VCE = 5.0V, VOUT = 0V,ILX = 100mA (*3) VIN = VCE = 3.6V, VOUT = 0V,ILX = 100mA (*4) VIN = VCE = 5.0V (*4) VIN = VCE = 3.6V VIN= VOUT =5.0V, VCE =0V, LX=0V (*8) VIN = VCE= 5.0V, VOUT = VOUT (T)x0.9V IOUT =30mA -40Topr85 VOUT=0V, Applied voltage to VCE, (*11) Voltage changes Lx to "H" level VOUT=0V, Applied voltage to VCE, (*11) Voltage changes Lx to "L" level When connected to external components, (*6), IOUT=1mA Voltage which oscillation (*13) frequency becomes 2550kHzfOSC3450kHz When connected to external components, (*6) IOUT=1mA , Voltage which oscillation (*13) frequency becomes fOSC2550kHz VIN = VCE =5.0V, VOUT = 0V VIN =5.0V, VCE = 0V, VOUT = 0V When connected to external components, VCE=0VVIN , IOUT=1mA VIN=VCE=5.0V, VOUT=0.8xVOUT(T) (*7) Short Lx at 1 resistance Sweeping VOUT, VIN=VCE=5.0V, Short Lx at 1 resistance, VOUT voltage which Lx becomes "L" level within 1ms VIN = 5.0V LX = 5.0V VCE = 0V VOUT = open Test frequency=1MHz T=40
MIN. 1.176 2.0 600 1.00 2550 190 100 900 0.65 VSS VIN 0.25 - 0.1 - 0.1 0.5 1.0 0.450 200 -
TYP. 1.200 1.40 46 21 0 3000 260 200 82 0.35 0.42 0.45 0.52 0.01 1050 100 0.9 0.600 300 1.5 1000
MAX. 1.224 6.0 1.78 65 35 1.0 3450 350 300 0 0.55 0.67 0.66 0.77 1.0 1350 6.0 0.25 VIN - 1.0 0.1 0.1 2.5 20 0.750 450 -
UNITS CIRCUIT V V mA V A A kHz mA % % % % A mA ppm/ V V V V A A ms ms V H mA
Maximum Duty Cycle Minimum Duty Cycle Efficiency Lx SW "H" ON Resistance 1 Lx SW "H" ON Resistance 2 Lx SW "L" ON Resistance 1 Lx SW "L" ON Resistance 2 (*5) Lx SW "H" Leak Current (*10) Current Limit Output Voltage Temperature Characteristics CE "H" Voltage CE "L" Voltage PWM "H" Level Voltage PWM "H" Level Voltage CE "H" Current CE "L" Current Soft Start Time Latch Time Short Protection Threshold Voltage CL Discharge Inductance Value Allowed Inductor Current
VPWMH VPWML ICEH ICEL tSS tLAT VSHORT RDCHG L IDC
(*13)
-
Test conditions: Unless otherwise stated, VIN=5.0V, VOUT (T) = Nominal Voltage NOTE: *1: Including hysteresis operating voltage range. *2: EFFI = { ( output voltagexoutput current ) / ( input voltagexinput current) }x100 *3: ON resistance ()= (VIN - Lx pin measurement voltage) / 100mA *4: Design value *5: When temperature is high, a current of approximately 10A (maximum) may leak. *6: The CE/MODE pin of the XCL207 series works also as an external switching pin of PWM control and PWM/PFM control. When the IC is in the operation, control is switched to the automatic PWM/PFM switching mode when the CE/MODE pin voltage is equal to or greater than VIN minus 0.3V, and to the PWM mode when the CE/MODE pin voltage is equal to or lower than VIN minus 1.0V and equal to or greater than VCEH. *7: Time until it short-circuits VOUT with GND via 1of resistor from an operational state and is set to Lx=0V from current limit pulse generating. *8: When VIN is less than 2.4V, limit current may not be reached because voltage falls caused by ON resistance. *9: When the difference between the input and the output is small, some cycles may be skipped completely before current maximizes. If current is further pulled from this state, output voltage will decrease because of P-ch driver ON resistance. *10: Current limit denotes the level of detection at peak of coil current. *11: "H"=VIN~VIN-1.2V, "L"=+0.1V~-0.1V *12: IPFM and DTYLIMIT_PFM are defined only for the XCL206 and XCL207 series which have PFM control function. (Not for the XCL 205 series) *13: VPWMH and VPWML are defined only for the XCL207 series. (They are not used in the XCL205/and XCL206 series)
8/26
XCL205/XCL206/XCL207
Series
ELECTRICAL CHARACTERISTICS (Continued)
XCL205C183AR/XCL206C183AR/ XCL207C183AR, VOUT=1.8V, fOSC=3.0MHz, Ta=25
PARAMETER Output Voltage Operating Voltage Range Maximum Output Current UVLO Voltage Supply Current (XCL205) Supply Current (XCL206, XCL207) Stand-by Current Oscillation Frequency PFM Switching Current PFM Duty Limit
(*12) (*12)
SYMBOL VOUT VIN IOUTMAX VUVLO IDD ISTB fOSC IPFM DTYLIMIT_PFM MAXDTY MINDTY EFFI RLH RLH RLL RLL ILeakH ILIM VOUT/ (VOUTtopr) VCEH VCEL
(*13)
CONDITIONS When connected to external components, VIN = VCE =5.0V, IOUT =30mA VIN=VOUT(E)+2.0V, VCE=1.0V (*9) When connected to external components VCE=VIN,VOUT=0V, (*1, *11) Voltage which Lx pin holding "L" level VIN =VCE=5.0V, VOUT= VOUT(T)x1.1V VIN =5.0V, VCE=0V, VOUT= VOUT(T)x1.1V When connected to external components, VIN =VOUT(T)+2.0V,VCE=1.0V, IOUT=100mA When connected to external components, VIN =VOUT(T)+2.0V, VCE = VIN , IOUT=1mA VCE= VIN =(C-1) IOUT=1mA VIN = VCE =5.0V, VOUT = VOUT (T)x0.9V VIN = VCE =5.0V, VOUT = VOUT (T)x1.1V When connected to external components, VCE = VIN VOUT (T)+1.2V, IOUT = 100mA (*3) VIN = VCE = 5.0V, VOUT = 0V,ILX = 100mA (*3) VIN = VCE = 3.6V, VOUT = 0V,ILX = 100mA (*4) VIN = VCE = 5.0V (*4) VIN = VCE = 3.6V VIN= VOUT =5.0V, VCE =0V, LX=0V (*8) VIN = VCE= 5.0V, VOUT = VOUT (T)x0.9V IOUT =30mA -40Topr85 VOUT=0V, Applied voltage to VCE, (*11) Voltage changes Lx to "H" level VOUT=0V, Applied voltage to VCE, (*11) Voltage changes Lx to "L" level When connected to external components, (*6), IOUT=1mA Voltage which oscillation (*13) frequency becomes 2550kHzfOSC3450kHz When connected to external components, (*6) IOUT=1mA , Voltage which oscillation (*13) frequency becomes fOSC2550kHz VIN = VCE =5.0V, VOUT = 0V VIN =5.0V, VCE = 0V, VOUT = 0V When connected to external components, VCE=0VVIN , IOUT=1mA VIN=VCE=5.0V, VOUT=0.8xVOUT(T) (*7) Short Lx at 1 resistance Sweeping VOUT, VIN=VCE=5.0V, Short Lx at 1 resistance, VOUT voltage which Lx becomes "L" level within 1ms VIN = 5.0V LX = 5.0V VCE = 0V VOUT = open Test frequency=1MHz T=40
MIN. 1.764 2.0 600 1.00 2550 170 100 900 0.65 VSS VIN 0.25 - 0.1 - 0.1 0.5 1.0 0.675 200 -
TYP. 1.800 1.40 46 21 0 3000 220 200 85 0.35 0.42 0.45 0.52 0.01 1050 100 0.9 0.900 300 1.5 1000
MAX. 1.836 6.0 1.78 65 35 1.0 3450 270 300 0 0.55 0.67 0.66 0.77 1.0 1350 6.0 0.25 VIN - 1.0 0.1 0.1 2.5 20 1.125 450 -
UNITS CIRCUIT V V mA V A A kHz mA % % % % A mA ppm/ V V V V A A ms ms V H mA
Maximum Duty Cycle Minimum Duty Cycle Efficiency Lx SW "H" ON Resistance 1 Lx SW "H" ON Resistance 2 Lx SW "L" ON Resistance 1 Lx SW "L" ON Resistance 2 (*5) Lx SW "H" Leak Current (*10) Current Limit Output Voltage Temperature Characteristics CE "H" Voltage CE "L" Voltage PWM "H" Level Voltage PWM "H" Level Voltage CE "H" Current CE "L" Current Soft Start Time Latch Time Short Protection Threshold Voltage CL Discharge Inductance Value Allowed Inductor Current
VPWMH VPWML ICEH ICEL tSS tLAT VSHORT RDCHG L IDC
(*13)
-
Test conditions: Unless otherwise stated, VIN=5.0V, VOUT (T) = Nominal Voltage NOTE: *1: Including hysteresis operating voltage range. *2: EFFI = { ( output voltagexoutput current ) / ( input voltagexinput current) }x100 *3: ON resistance ()= (VIN - Lx pin measurement voltage) / 100mA *4: Design value *5: When temperature is high, a current of approximately 10A (maximum) may leak. *6: The CE/MODE pin of the XCL207 series works also as an external switching pin of PWM control and PWM/PFM control. When the IC is in the operation, control is switched to the automatic PWM/PFM switching mode when the CE/MODE pin voltage is equal to or greater than VIN minus 0.3V, and to the PWM mode when the CE/MODE pin voltage is equal to or lower than VIN minus 1.0V and equal to or greater than VCEH. *7: Time until it short-circuits VOUT with GND via 1of resistor from an operational state and is set to Lx=0V from current limit pulse generating. *8: When VIN is less than 2.4V, limit current may not be reached because voltage falls caused by ON resistance. *9: When the difference between the input and the output is small, some cycles may be skipped completely before current maximizes. If current is further pulled from this state, output voltage will decrease because of P-ch driver ON resistance. *10: Current limit denotes the level of detection at peak of coil current. *11: "H"=VIN~VIN-1.2V, "L"=+0.1V~-0.1V *12: IPFM and DTYLIMIT_PFM are defined only for the XCL206 and XCL207 series which have PFM control function. (Not for the XCL 205 series) *13: VPWMH and VPWML are defined only for the XCL207 series. (They are not used in the XCL205/and XCL206 series)
9/26
XCL205/XCL206/XCL207 Series
ELECTRICAL CHARACTERISTICS (Continued)
PFM Switching Current (IPFM) by Nominal Output Voltage (XCL206/XCL207 Series)
NOMINAL OUTPUT VOLTAGE 0.8V VOUT(T) 1.2V 1.2V VOUT(T) 1.8V 1.8V VOUT(T) 4.0V MIN. 190mA 180mA 170mA TYP. 260mA 240mA 220mA MAX. 350mA 300mA 270mA
Input Voltage (VIN) for PFM Duty Limit (XCL206/XCL207 Series)
fOSC VIN Voltage (C-1) Minimum voltage (C-1) is 2.0V. 3.0MHz VOUT(T)+1.0V
Soft-Start Time, Nominal Output VoltageXCL205B/XCL206B/XCL207B Series
SERIES XCL205B/ XCL206B/XCL207B fOSC 3.0MHz NOMINAL OUTPUT VOLTAGE 0.8VVOUT(T)<1.8V 1.8VVOUT(T) 4.0V MIN. TYP. 0.25ms 0.32ms MAX. 0.40ms 0.50ms
TYPICAL APPLICATION CIRCUIT
XCL205/XCL206/XCL207 Series
L1 Lx Vss CL V OUT CE/MODE L2 V IN Vss
CIN
External Components
CIN : 10V/4.7F (Ceramic) CL : 6.3V/10F (Ceramic) NOTE The Inductor can be used only for this DC/DC converter. Please do not use this inductor for the other reasons. Please use B, X5R, and X7R grades in temperature characteristics for CIN and CL capacitors. These grade ceramic capacitors minimize capacitance-loss as a function of voltage stress.
10/26
XCL205/XCL206/XCL207
Series
OPERATIONAL DESCRIPTION
The XCL205/XCL/206/XCL207 series consists of a reference voltage source, ramp wave circuit, error amplifier, PWM comparator, phase compensation circuit, output voltage adjustment resistors, P-channel MOSFET driver transistor, N-channel MOSFET switching transistor for the synchronous switch, current limiter circuit, UVLO circuit with control IC, and an inductor. (See the block diagram above.) Using the error amplifier, the voltage of the internal voltage reference source is compared with the feedback voltage from the VOUT pin through split resistors, R1 and R2. Phase compensation is performed on the resulting error amplifier output, to input a signal to the PWM comparator to determine the turn-on time during PWM operation. The PWM comparator compares, in terms of voltage level, the signal from the error amplifier with the ramp wave from the ramp wave circuit, and delivers the resulting output to the buffer driver circuit to cause the Lx pin to output a switching duty cycle. This process is continuously performed to ensure stable output voltage. The current feedback circuit monitors the P-channel MOS driver transistor current for each switching operation, and modulates the error amplifier output signal to provide multiple feedback signals. This enables a stable feedback loop even when a low ESR capacitor such as a ceramic capacitor is used ensuring stable output voltage.
The reference voltage source provides the reference voltage to ensure stable output voltage of the DC/DC converter. The ramp wave circuit determines switching frequency. The frequency is fixed internally 3.0MHz. Clock pulses generated in this circuit are used to produce ramp waveforms needed for PWM operation, and to synchronize all the internal circuits. The error amplifier is designed to monitor output voltage. The amplifier compares the reference voltage with the feedback voltage divided by the internal split resistors, R1 and R2. When a feed back voltage is lower than the reference voltage, the output voltage of the error amplifier is increased. The gain and frequency characteristics of the error amplifier output are fixed internally to deliver an optimized signal to the mixer. The current limiter circuit of the XCL205/XCL206/XCL207 series monitors the current flowing through the P-channel MOS driver transistor connected to the Lx pin, and features a combination of the current limit mode and the operation suspension mode. When the driver current is greater than a specific level, the current limit function operates to turn off the pulses from the Lx pin at any given timing. When the driver transistor is turned off, the limiter circuit is then released from the current limit detection state. At the next pulse, the driver transistor is turned on. However, the transistor is immediately turned off in the case of an over current state. When the over current state is eliminated, the IC resumes its normal operation. The IC waits for the over current state to end by repeating the steps through . If an over current state continues for a few milliseconds and the above three steps are repeatedly performed, the IC performs the function of latching the OFF state of the driver transistor, and goes into operation suspension state. Once the IC is in suspension state, operations can be resumed by either turning the IC off via the CE/MODE pin, or by restoring power to the VIN pin. The suspension state does not mean a complete shutdown, but a state in which pulse output is suspended; therefore, the internal circuitry remains in operation. The current limit of the XCL205/XCL206/XCL207 series can be set at 1050mA at typical. Depending on the state of the PC Board, latch time may become longer and latch operation may not work. In order to avoid the effect of noise, an input capacitor is placed as close to the IC as possible.
Limit < # ms Limit > # ms
Current Limit LEVEL I Lx 0mA Vss
V OUT Lx
V CE
Restart
V IN
11/26
XCL205/XCL206/XCL207 Series
OPERATIONAL DESCRIPTION (Continued)

The short-circuit protection circuit monitors the internal R1 and R2 divider voltage from the VOUT pin (refer to FB point in the block diagram shown in the previous page). In case where output is accidentally shorted to the Ground and when the FB point voltage decreases less than half of the reference voltage (Vref) and a current more than the ILIM flows to the driver transistor, the short-circuit protection quickly operates to turn off and to latch the driver transistor. In the latch state, the operation can be resumed by either turning the IC off and on via the CE/MODE pin, or by restoring power supply to the VIN pin. When sharp load transient happens, a voltage drop at the VOUT is propagated to the FB point through CFB, as a result, short circuit protection may operate in the voltage higher than 1/2 VOUT voltage. When the VIN pin voltage becomes 1.4V or lower, the P-channel output driver transistor is forced OFF to prevent false pulse output caused by unstable operation of the internal circuitry. When the VIN pin voltage becomes 1.8V or higher, switching operation takes place. By releasing the UVLO function, the IC performs the soft start function to initiate output startup operation. The soft start function operates even when the VIN pin voltage falls momentarily below the UVLO operating voltage. The UVLO circuit does not cause a complete shutdown of the IC, but causes pulse output to be suspended; therefore, the internal circuitry remains in operation. In PFM control operation, until coil current reaches to a specified level (IPFM), the IC keeps the P-ch MOSFET on. In this case, on-time (tON) that the P-ch MOSFET is kept on can be given by the following formula. tON = LxIPFM / (VINVOUT) IPFM In the PFM control operation, the PFM Duty Limit (DTYLIMIT_PFM) is set to 200% (TYP.). Therefore, under the condition that the duty increases (e.g. the condition that the step-down ratio is small), it's possible for P-ch MOSFET to be turned off even when coil IPFM current doesn't reach to IPFM.
Maximum IPFM Limit
tON
Lx IPFM ILx 0mA
Lx
fOSC
IPFM ILx 0mA
IPFM
IPFM
12/26
XCL205/XCL206/XCL207
Series
OPERATIONAL DESCRIPTION (Continued)
CL High Speed Discharge The XCL205B(C)/ XCL206B(C)/ XCL207B(C) series can quickly discharge the electric charge at the output capacitor (CL) when a low signal to the CE pin which enables a whole IC circuit put into OFF state, is inputted via the N-channel transistor located between the LX pin and the VSS pin. When the IC is disabled, electric charge at the output capacitor (CL) is quickly discharged so that it may avoid application malfunction. Discharge time of the output capacitor (CL) is set by the CL auto-discharge resistance (R) and the output capacitor (CL). By setting time constant of a CL auto-discharge resistance value [R] and an output capacitor value (CL) as (=C x R), discharge time of the output voltage after discharge via the N channel transistor is calculated by the following formula. V = VOUT(T) x e -t/ or t=ln (VOUT(T) / V) V : Output voltage after discharge VOUT(T) : Output voltage t: Discharge time, : C x R C= Capacitance of Output capacitor (CL) R= CL auto-discharge resistance
Output Voltage Discharge Characteristics
RDCHG=300(TYP.)
100
CL=10uF CL=20uF CL=50uF
Output Voltage (Relative Value) 100 = Setting Voltage Value
80
60
40
20
0 0 20 40 60 80 100 Discharge Time (ms)
13/26
XCL205/XCL206/XCL207 Series
OPERATIONAL DESCRIPTION (Continued)
The operation of the XCL205/XCL206/ XCL207 series will enter into the shut down mode when a low level signal is input to the CE/MODE pin. During the shutdown mode, the current consumption of the IC becomes 0A (TYP.), with a state of high impedance at the Lx pin and VOUT pin. The IC starts its operation by inputting a high level signal to the CE/MODE pin. The input to the CE/MODE pin is a CMOS input and the sink current is 0A (TYP.).
XCL205/XCL206 series - Examples of how to use CE/MODE pin
V DD V IN V DD V IN
(A) SW_CE SELECTED STATUS Stand-by Operation
R1 CE/MODE
SW_CE CE/MODE
ON OFF (B)
SW_CE
R2
SW_CE
< IC inside >
SELECTED STATUS Operation Stand-by
< IC inside >
ON OFF
A
B
XCL207 series - Examples of how to use CE/MODE pin
V DD V IN V DD V IN
(A) SW_CE SW_PWM/PFM SELECTED STATUS PWM/PFM ON OFF * ON OFF Automatic Switching Control PWM Control Stand-by
SW_PWM/PFM
SW_CE
RM1
CE/MODE
RM1
CE/MODE
RM2
RM2 < IC inside >
SW_PWM/PFM
SW_CE < IC inside >
OFF (B)
A
B SW_CE SW_PWM/PFM * ON OFF
SELECTED STATUS Stand-by PWM Control PWM/PFM Automatic Switching Control
Intermediate voltage can be generated by RM1 and RM2. Please set the value of each R1, R2, RM1, RM2 from few hundreds k to few hundreds M. For switches, CPU open-drain I/O port and transistor can be used.
ON OFF OFF
14/26
XCL205/XCL206/XCL207
Series
OPERATIONAL DESCRIPTION (Continued)
The XCL205/XCL206/XCL207 series (A series and C series) provide 0.9ms (TYP). The XCL205B/XCL206B/XCL207B series provide 0.32ms (TYP) however, when VOUT is less than 1.8V, provide 0.25ms (TYP.). Soft start time is defined as the time to reach 90% of the output nominal voltage when the CE pin is turned on.
tSS
VCEH 0V VOUT
90% of setting voltage
0V
FUNCTION CHART
CE/MODE VOLTAGE LEVEL H Level
(*1)
OPERATIONAL STATES XCL205 Synchronous PWM Fixed Control XCL206 Synchronous PWM/PFM Automatic Switching Stand-by XCL207 Synchronous PWM/PFM Automatic Switching Synchronous PWM Fixed Control Stand-by
M Level L Level
(*2)
Stand-by
(*2)
Note on CE/MODE pin voltage level range (*1) H level: 0.65V < H level < 6V (for XCL205/XCL206) H level: VIN - 0.25V < H level < VIN (for XCL207) (*2) M level: 0.65V < M level < VIN - 1.0V (for XCL207) (*3) L level: 0V < L level < 0.25V
15/26
XCL205/XCL206/XCL207 Series
NOTE ON USE
1. The XCL205/XCL206/XCL207 series is designed for use with ceramic output capacitors. If, however, the potential difference is too large between the input voltage and the output voltage, a ceramic capacitor may fail to absorb the resulting high switching energy and oscillation could occur on the output. If the input-output potential difference is large, connect an electrolytic capacitor in parallel to compensate for insufficient capacitance. 2. Spike noise and ripple voltage arise in a switching regulator as with a DC/DC converter. These are greatly influenced by external component selection, such as the coil inductance, capacitance values, and board layout of external components. Once the design has been completed, verification with actual components should be done. 3. Depending on the input-output voltage differential, or load current, some pulses may be skipped, and the ripple voltage may increase. 4. When the difference between VIN and VOUT is large in PWM control, very narrow pulses will be outputted, and there is the possibility that some cycles may be skipped completely. 5. When the difference between VIN and VOUT is small, and the load current is heavy, very wide pulses will be outputted and there is the possibility that some cycles may be skipped completely. 6. With the IC, the peak current of the coil is controlled by the current limit circuit. Since the peak current increases when dropout voltage or load current is high, current limit starts operation, and this can lead to instability. When peak current becomes high, please adjust the coil inductance value and fully check the circuit operation. In addition, please calculate the peak current according to the following formula: Ipk = (VIN - VOUT) x OnDuty / (2 x L x fOSC) + IOUT L: Coil Inductance Value fOSC: Oscillation Frequency 7. When the peak current which exceeds limit current flows within the specified time, the built-in P-ch driver transistor turns off. During the time until it detects limit current and before the built-in transistor can be turned off, the current for limit current flows; therefore, care must be taken when selecting the rating for the external components such as a coil. 8. When VIN is less than 2.4V, limit current may not be reached because voltage falls caused by ON resistance. 9. Depending on the state of the PC Board, latch time may become longer and latch operation may not work. In order to avoid the effect of noise, the board should be laid out so that input capacitors are placed as close to the IC as possible. 10. Use of the IC at voltages below the recommended voltage range may lead to instability. 11. This IC should be used within the stated absolute maximum ratings in order to prevent damage to the device. 12. When the IC is used in high temperature, output voltage may increase up to input voltage level at no load because of the leak current of the driver transistor. 13. The current limit is set to 1350mA (MAX.) at typical. However, the current of 1350mA or more may flow. In case that the current limit functions while the VOUT pin is shorted to the GND pin, when P-ch MOSFET is ON, the potential difference for input voltage will occur at both ends of a coil. For this, the time rate of coil current becomes large. By contrast, when N-ch MOSFET is ON, there is almost no potential difference at both ends of the coil since the VOUT pin is shorted to the GND pin. Consequently, the time rate of coil current becomes quite small. According to the repetition of this operation, and the delay time of the circuit, coil current will be converged on a certain current value, exceeding the amount of current, which is supposed to be limited originally. Even in this case, however, after the over current state continues for several ms, the circuit will be latched. A coil should be used within the stated absolute maximum rating in order to prevent damage to the device. Current flows into P-ch MOSFET to reach the current limit (ILIM). The current of ILIM or more flows since the delay time of the circuit occurs during from the detection of the current limit to OFF of P-ch MOSFET. Because of no potential difference at both ends of the coil, the time rate of coil current becomes quite small. Lx oscillates very narrow pulses by the current limit for several ms. The circuit is latched, stopping its operation.
Duty Lx Limit > # ms
ILIM
ILx
16/26
XCL205/XCL206/XCL207
Series
NOTE ON USE (Continued)
14. In order to stabilize VIN voltage level and oscillation frequency, we recommend that a by-pass capacitor (CIN) be connected as close as possible to the VIN & VSS pins. 15. High step-down ratio and very light load may lead an intermittent oscillation when PWM mode. 16. Please use within the power dissipation range below. Please also note that the power dissipation may changed by test conditions, the power dissipation figure shown is PCB mounted.
1.2 Maximum Power Disspation Pd (W) 1.0 0.8 0.6 0.4 0.2 0.0 0 25 50 75 100
Operating TemperatureTa ()
the power loss of micro DC/DC according to the following formula: power loss = VOUTxIOUTx((100/EFFI) - 1) VOUTOutput Voltage (V) IOUT Output Current (A) EFFIConversion Efficiency (%)
40.0
(W)
Measurement Condition (Reference data) Condition: Mount on a board Ambient: Natural convection Soldering: Board: Lead (Pb) free 2 Dimensions 40 x 40 mm (1600 mm in one side) Copper (Cu) traces occupy 50% of the board area In top and back faces Package heat-sink is tied to the copper traces Glass Epoxy (FR-4) 1.6mm 4 x 0.8 Diameter
28.9
Material: Thickness: Through-hole:
28.9
2.54
.
1.4
Evaluation Board (Unit: mm)
17/26
2.5
40.0
.
XCL205/XCL206/XCL207 Series
NOTE ON USE (Continued)
Instructions of pattern layouts
1. In order to stabilize VIN voltage level, we recommend that a by-pass capacitor (CIN) be connected as close as possible to the VIN (No.6) & VSS (No.5) pins. 2. Please mount each external component as close to the IC as possible. 3. Wire external components as close to the IC as possible and use thick, short connecting traces to reduce the circuit impedance. 4. Make sure that the PCB GND traces are as thick as possible, as variations in ground potential caused by high ground currents at the time of switching may result in instability of the IC. 5. This series' internal driver transistors bring on heat because of the output current and ON resistance of driver transistors. 6. Please connect Lx (No.1) pin and L1 (No.7) pin by wiring on the PCB. 7. Please connect VOUT (No.3) pin and L2 (No.8) pin by wiring on the PCB.
VOUT CL
GND
VOUT
GND
LX CE CE IC CIN GND VIN GND VIN LX
FRONT
BACK (Flip Horizontal)
VOUT CL
GND
LX
CE
IC CIN
GND
VIN
FRONT (PCB mounted)
18/26
XCL205/XCL206/XCL207
Series
TEST CIRCUITS
< Circuit No.1 >
Wave Form Measure Point L1 VIN CE/ MODE VSS Lx
< Circuit No.2 >
A
CIN
A
CL
VIN CE/ MODE VSS
L1 Lx
VOUT L2
V
1F
VOUT L2
External Components CIN : 4.7F(ceramic) CL : 10F(ceramic)
< Circuit No.3 >
Wave Form Measure Point
< Circuit No.4 >
L1 VIN CE/ MODE VSS Lx
Rpulldown 200
VIN CE/ MODE VSS
L1 Lx
1F
VOUT L2
1F
VOUT L2
V
100mA
ON resistance = (VIN-VLx)/100mA
< Circuit No.5 >
L1 VIN
1F ICEH
ILeakH
< Circuit No.6 >
L1
Wave Form Measure Point
Lx
A
ILeakL 1F
VIN CE/ MODE VSS
Lx
A
ICEL
CE/ MODE VSS
VOUT L2
VOUT L2
V
ILIM
< Circuit No.7 >
L1 VIN CE/ MODE VSS Lx
Ilat Wave Form Measure Point
< Circuit No.8 >
L1 VIN CE/ MODE VSS Lx
ILx
A
1F
VOUT L2
Rpulldown 1
1uF
VOUT L2
< Circuit No.9 >
L1
< Circuit No.10 >
VIN CE/ MODE VSS Lx
Wave Form Measure Point L
A
CIN
A
CIN
L1 VIN CE/ MODE VSS Lx
VOUT L2
VOUT L2
CL
V
*External Components External Components L L 1.5H : : 1.5uH() CINCIN 4.7F(ceramic) : : 4.7F(ceramic) CL CL 10F(ceramic) : : 10F(ceramic)
19/26
XCL205/XCL206/XCL207 Series
TYPICAL PERFORMANCE CHARACTERISTICS
(1) Efficiency vs. Output Current XCL205A183AR/XCL206A183AR/XCL207A183AR (2) Output Voltage vs. Output Current XCL205A183AR/XCL206A183AR/XCL207A183AR
100 80 Efficency:EFFI(%) 60 40 20 0 0.1
XCL206/XCL207(PWM/PFM) Output Voltage:VOUT(V)
2.1 2.0 1.9 1.8 1.7 1.6 1.5 XCL/206/XCL207 (PWM/PFM) VIN4.2V,3.6V,2.4V
2.4V 3.6V VIN= 4.2V
XCL205/XCL207 (PWM)
XCL205/XCL207 (PWM)
1
10
100
1000
0.1
1
10
100
1000
Output Current:IOUT (mA)
(3) Ripple Voltage vs. Output Current XCL205A183AR/XCL206A183AR/XCL207A183AR
Output Current:IOUT (mA)
(4) Oscillation Frequency vs. Ambient Temperature XCL205A183AR/XCL206A183AR/XCL207A183AR
100 80 60 40 20 0 0.1 1 10 100 1000 Output Current:IOUT (mA)
(5) Supply Current vs. Ambient Temperature XCL206A183AR/XCL207A183AR
3.5 Oscillation Frequency : fosc(MHz) 3.4 3.3 3.2 3.1 3.0 2.9 2.8 2.7 2.6 2.5 -50 -25 0 25 50 75 100 Ambient Temperature: Ta ()
(6) Output Voltage vs. Ambient Temperature XCL205A183AR/XCL206A183AR/XCL207A183AR
Ripple Voltage:Vr(mV)
XCL205/XCL207 (PWM) VIN4.2V,3.6V,2.4V
XCL206/XCL207 (PWM/PFM) VIN4.2V 3.6V 2.4V
VIN=3.6V
40 35 Supply Current : IDD (A) 30 25 20 15 10 5 0 -50 2.0V 4.0V VIN=6.0V Output Voltage : VOUT (V)
2.1 2.0 1.9 VIN=3.6V 1.8 1.7 1.6 1.5 -25 0 25 50 75 100 -50 -25 0 25 50 75 100 Ambient Temperature: Ta () Ambient Temperature: Ta ()
20/26
XCL205/XCL206/XCL207
Series
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(7) UVLO Voltage vs. Ambient Temperature XCL205A183AR/XCL206A183AR/XCL207A183AR (8) CE "H" Voltage vs. Ambient Temperature XCL205A183AR/XCL206A183AR/XCL207A183AR
1.8 CE=VIN CE "H" Voltage : VCEH (V) UVLO Voltage : UVLO (V) 1.5 1.2 0.9 0.6 0.3 0.0 -50 -25 0 25 50 75 100 Ambient Temperature: Ta ( )
(9) CE "L" Voltage vs. Ambient Temperature XCL205A183AR/XCL206A183AR/XCL207A183AR
1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 -50 -25 0 25 50 75 100 Ambient Temperature: Ta ()
(10) Soft Start Time vs. Ambient Temperature XCL205A183AR/XCL206A183AR/XCL207A183AR
VIN=5.0V 3.6V
2.4V
1.0 0.9 CE "L" Voltage : VCEL (V) 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 -50 -25 0 25 50 75 100 Ambient Temperature: Ta ( )
(11) "Pch / Nch" Driver on Resistance vs. Input Voltage XCL205A183AR/XCL206A183AR/XCL207A183AR
5.0 Soft Start Time : tss (ms) 4.0 3.0 2.0 VIN=3.6V 1.0 0.0 -50 -25 0 25 50 75 100 Ambient Temperature: Ta ()
(12) Rise Wave Form XCL205B333AR/XCL206B333AR/XCL207B333AR
0.8 VIN=5.0V 3.6V
2.4V
Lx SW ON Resistance:RLxH,RLxL ()
1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 0 1 2 3 4 5 6 Input Voltage : VIN (V) Pch on Resistance
1ch 2ch
Nch on Resistance
XCL206B333 VIN=5.0V IOUT=1.0mA
VOUT
CE:0.0V1.0V
1ch:1V/div 2ch:1V/div
Time: 100s /div Time:100s/div
21/26
XCL205/XCL206/XCL207 Series
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(13) Soft-Start Time vs. Ambient Temperature XCL205B333AR/XCL206B333AR/XCL207B333AR (14) CL Discharge Resistance vs. Ambient Temperature XCL205B333AR/XCL206B333AR/XCL207B333AR
500
600
CL Discharge Resistance: ()
XCL207B333
Soft Start Time : tss (s)
400 300 200 100 0 -50
VIN=5.0V IOUT=1.0mA
500 400 300 200 100 -50 VIN=6.0V 2.0V
4.0V
-25
0
25
50
75
100
-25
0
25
50
75
100
Ambient Temperature: Ta ()
(15) Load Transient Response MODEPWM/PFM Automatic Switching Control XCL206A183AR/XCL207A183AR
VIN=3.6V,VOUT=1.8V
Ambient Temperature: Ta ( )
XCL206A183AR/XCL207A183AR
VIN=3.6V,VOUT=1.8V
IOUT=1mA 100mA
IOUT=1mA 300mA
1ch
1ch
VOUT 2ch
VOUT 2ch
1ch:100mA/div 2ch:50mV/div
1ch:100mA/div 2ch:50mV/div
Time:100s/div Time: 100s /div
Time:100s/div Time: 100s /div
XCL206A183AR/XCL207A183AR
VIN=3.6V,VOUT=1.8V
XCL206A183AR/XCL207A183AR
VIN=3.6V,VOUT=1.8V
IOUT=100mA 1mA
IOUT=300mA 1mA
1ch
1ch
2ch VOUT
2ch VOUT
1ch:100mA/div 2ch:50mV/div
1ch:100mA/div 2ch:50mV/div
Time:100s/div Time: 100s /div
Time:100s/div Time: 100s /div
22/26
XCL205/XCL206/XCL207
Series
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(15) Load Transient Response (Continued) MODEPWM Control XCL205A183AR/XCL207A183AR
VIN=3.6V,VOUT=1.8V
XCL205A183AR/XCL207A183AR
VIN=3.6V,VOUT=1.8V
IOUT=1mA 100mA
IOUT=1mA 300mA
1ch
1ch
2ch
2ch
1ch:100mA/div 2ch:50mV/div
1ch:100mA/div 2ch:50mV/div
Time:100s/div Time: 100s /div
Time:100s/div Time: 100s /div
XCL205A183AR/XCL207A183AR
VIN=3.6V,VOUT=1.8V
XCL205A183AR/XCL207A183AR
VIN=3.6V,VOUT=1.8V 1ch
IOUT=100mA 1mA 1ch
IOUT=300mA 1mA
2ch
2ch
1ch:100mA/div 2ch:50mV/div
1ch:100mA/div 2ch:50mV/div
Time:100s/div Time: 100s /div
Time:100s/div Time: 100s /div
23/26
XCL205/XCL206/XCL207 Series
PACKAGING INFORMATION
CL-2025
External Lead
Reference Pattern Layout
Reference Metal Mask Design
24/26
XCL205/XCL206/XCL207
Series
MARKING RULE
CL-2025
represents products series MARK PRODUCT SERIES 4 C K 5 D L 6 E M XCL205A*****-G XCL205B*****-G XCL205C*****-G XCL206A*****-G XCL206B*****-G XCL206C*****-G XCL207A*****-G XCL207B*****-G XCL207C*****-G
1
6 5 4

2 3
represents type of DC/DC converters OUTPUT VOLTAGE (V) 0.x 1.x 2.x 3.x 4.x MARK OCSILLATION FREQUENCY=3.0MHz (XCL20****3**-G) F H K L M
represents the decimal part of output voltage OUTPUT VOLTAGE (V) MARK PRODUCT SERIES X.0 X.05 X.1 X.15 X.2 X.25 X.3 X.35 X.4 X.45 X.5 X.55 X.6 X.65 X.7 X.75 X.8 X.85 X.9 X.95 0 A 1 B 2 C 3 D 4 E 5 F 6 H 7 K 8 L 9 M XCL20***0***-G XCL20***A***-G XCL20***1***-G XCL20***B***-G XCL20***2***-G XCL20***C***-G XCL20***3***-G XCL20***D***-G XCL20***4***-G XCL20***E***-G XCL20***5***-G XCL20***F***-G XCL20***6***-G XCL20***H***-G XCL20***7***-G XCL20***K***-G XCL20***8***-G XCL20***L***-G XCL20***9***-G XCL20***M***-G
, represents production lot number 01090A0Z119ZA1A9AAZ9ZAZZ in order. (G, I, J, O, Q, W excluded) Note: No character inversion used.
25/26
XCL205/XCL206/XCL207 Series
1. The products and product specifications contained herein are subject to change without notice to improve performance characteristics. Consult us, or our representatives before use, to confirm that the information in this datasheet is up to date. 2. We assume no responsibility for any infringement of patents, patent rights, or other rights arising from the use of any information and circuitry in this datasheet. 3. Please ensure suitable shipping controls (including fail-safe designs and aging protection) are in force for equipment employing products listed in this datasheet. 4. The products in this datasheet are not developed, designed, or approved for use with such equipment whose failure of malfunction can be reasonably expected to directly endanger the life of, or cause significant injury to, the user. (e.g. Atomic energy; aerospace; transport; combustion and associated safety equipment thereof.) 5. Please use the products listed in this datasheet within the specified ranges. Should you wish to use the products under conditions exceeding the specifications, please consult us or our representatives. 6. We assume no responsibility for damage or loss due to abnormal use. 7. All rights reserved. No part of this datasheet may be copied or reproduced without the prior permission of TOREX SEMICONDUCTOR LTD.
26/26

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