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NP-Channel Power MOSFET Built-in NMaximum Output Current : 500mA NOutput Voltage Range NOscillator Frequency NMaximum Duty Ratio NHigh Efficiency NSOP-8 Package : 1.5~6.0V : 300kHz : 100% : 95%
GElectronic Information Organizers GPalmtops GCellular and portable phones GPortable Audio Systems GVarious Multi-function Power Supplies
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The XC6376/77 series are step-down DC/DC converters with built-in Pchannel power MOSFETs. A highly efficient DC/DC converter with output currents of 500mA can be realised using only four peripherals - a coil, a diode and 2 capacitors. Output voltage can be internally set-up in 0.1V increments (2.5%) between 1.5V and 6.0V (VOUT type). Alternatively, output voltage can be set-up at will using a 1.0V internal reference voltage source and peripherals (FB type). It is possible to reduce the size of the peripherals used since the switching frequency is 300kHz. The PWM//PFM switchable XC6377 operates in PFM mode during light loads and is highly efficient from light loads to large output currents. Required values for soft start time can be regulated via the external capacitor and the stand-by function reduces supply current to less than 2.5A. U.V.L.O and protection are built-in. Input voltage range : 1.8V~10V Output voltage range : 1.5V~6.0V programmable in 0.1V steps (2.5%) Oscillator frequency : 300kHz (1.5%) : Custom products for 180, 500kHz Max. output current : 500mA (min.)VIN=3.6V, VOUT=3.0V High Efficiency : 95% (typ.) Stand-by capability : ISTB=2.5A (max.) Soft-start time set-up externally type U.V.L.O, Pch boost, VOUT reset functions available Internally set-up output voltage type (VOUT) Externally set-up output voltage type (FB) Pchannel Power MOSFET built-in Package : SOP-8
577
PIN NUMBER 1 2 3 4 5 6 7 8
PIN NAME VIN EXT/2 P_BST CE VOUT (FB) GND EXT/1 LX
FUNCTION Power supply input External drive pin 2 ("L" when Pch MOSFET ON) P-ch gate boost Chip enable Soft-start capacitor connection Output voltage monitor (FB=externally set-up type) Ground External drive pin 1 ("L" when P-ch MOSFET ON) P-ch power MOSFET switch
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GSelection Guide
578
GOrdering Information
XC6376 XC6376 Series
SYMBOL A B C D E F
PWM Control
VOUT/FB VOUT FB VOUT FB VOUT VOUT VOUT RESET FUNCTION NO NO YES YES =0) INTEGRAL CIRCUIT PROTECTION YES YES NO NO YES NO
Output voltage e.g. 3.0V output : ( =3, FB products (B,D types) : ( =1, =0) 3 5 2 S R L Oscillator frequency 300kHz Oscillator frequency 500kHz Oscillator frequency 180kHz Package SOP-8 Embossed Tape : Standard Feed : Reverse Feed
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XC6377 XC6377 Series
PWM/PFM switching control (same as XC6376 series)
GSOP-8
579
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12345 678
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XC6376, XC6377 Series A,C types (VOUT)
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XC6376, XC6377 Series B,D types (FB)
580
XC6376, XC6377 Series E,F types (VOUT, VOUT rest function)
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Ta=25: PARAMETER VIN Pin Voltage VOUT Pin Voltage (FB Pin Voltage) LX Pin Voltage P_BST Pin Voltage Other Pin Voltage LX Pin Current EXT/1,2 Pin Current Continuous Total Power Dissipation Operating Ambient Temperature Storage Temperature SYMBOL VIN VOUT (VFB) VLX P_BST V~ ILX IEXT/1,2 Pd Topr Tstg RATINGS -0.3 ~ 12 -0.3 ~ 12 (-0.3 ~ VIN +0.3) VIN -12 ~ VIN +0.3 VIN -12 ~ VIN +0.3 -0.3 ~ VIN +0.3 700 50 300 -30 ~ +80 -40 ~ +125 UNITS V V V V V mA mA mW : :
581
XC6376A333SR, XC6377A333SR
PARAMETER Output Voltage Output Voltage2 Maximum Input Voltage Maximum Output Current Input Current Supply Current (oscillation stopped) Stand-by Current Lx SW ON Resistance SYMBOL VOUT1 VOUT2 VIN IOUTMAX IIN IDD ISTB RSWON ILXL FOSC MAXDTY PFMDTY EFFI VUVLO Tss TPRO VCEH VCEL
(VOUT=3.3V, FOSC=300kHz) CONDITIONS External components connected, VIN=output programmed voltage x 1.2, IOUT=132mA External components connected, VIN=output programmed voltage x 1.6, (when VIN 3.0V, VIN =3.0V) External components connected, VIN=output programmed voltage x 1.2, External components connected, VIN=VOUT x 1.05, No load. XC6376 XC6377 MIN TYP
Ta=25: MAX UNITS V V V mA 1.480 2.190 55 26 1.5 0.64 86 39 2.5 0.85 2.0 255 100 15 300 345 mA A A A A kHz % % % 1.8 10.0 5.0 16.0 8.0 V msec msec V 0.20 35 47 V
3.218 3.300 3.383 VOUT1 -0.5% 10 600 VOUT1 +1.5%
Only CSS connected, VIN = output programmed voltage x 1.2, VOUT= VIN, VLX=VIN Same as IDD. CE=0V Same as IDD except VOUT=output programmed voltage x0.9, VLX=VIN-0.2V, pull down LX to 10, CE=VIN Same as ISTB except VLX=0V External components connected, measuring of EXT/1 waveform, VIN=VOUT1 +0.3V, IOUT=20mA External components connected, No load. Same as VOUT 1 Only CSS connected, VIN = output programmed voltage x 0.9, CE= VIN, LX OFF voltage when VIN drops. 0.9 6.0 Only CSS connected, VIN = output programmed voltage x 1.2, Time taken for CE to become "L" when VOUT changes to 0V Only CSS connected, VIN = output programmed voltage x 1.2, VOUT=0V, Apply voltage to CE and measure EXT/1,2 "L" Only CSS connected, VIN = output programmed voltage x 1.2, VOUT=0V, Apply voltage to CE and measure EXT/1,2 "H" Only CSS connected, VIN = output programmed voltage x 1.2, CE=0V, VOUT=VIN, EXT/1,2 pull down to 200, VEXT/1,2=VIN - 0.4V Only CSS connected, VIN = output programmed voltage x 1.2, CE=VIN, VOUT=output programmed voltage x 0.9, EXT/1,2 pull up to 200, VEXT/1,2=0.4V 3.0 0.65
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Lx Leak Current Oscillator Frequency (Note1) Maximum Duty Ratio PFM Duty Ratio (Note2) Efficiency (Note3) Minimum Operating Voltage (UVLO Voltage) Soft-Start Time Circuit Protect Integration Time CE "High" Voltage CE "Low" Voltage
25 95
35
EXT/1,2 "H" ON Resistance
REXTBH
EXT/1,2 "L" ON Resistance
REXTBL
29
37
Note 1: Refers to the oscillation frequency during PWM control. Note 2: Applies to the XC6377 series only (duty ratio when control changes to PFM) Note 3: EFFI = { [(output voltage) x (output current)] / [(input voltage) x (input current)]} x100
XC6376E, XC6376F, XC6377E, XC6377F
The following parameter is to be added:
PARAMETER VOUT Sink Current
SYMBOL IVOUTL
CONDITIONS Same as ISTB, VOUT=1.0V
MIN 1.45
TYP
MAX UNITS mA
XC6376C, XC6376F, XC6377C, XC6377F
The following parameter is to be excluded: Circuit Protect Integration Time (TPRO)
582
XC6376A503SR, XC6377A503SR
PARAMETER Output Voltage Output Voltage2 Maximum Input Voltage Maximum Output Current Input Current Supply Current (oscillation stopped) Stand-by Current Lx SW ON Resistance Lx Leak Current Oscillator Frequency (Note1) Maximum Duty Ratio PFM Duty Ratio (Note2) Efficiency (Note3) Minimum Operating Voltage (UVLO Voltage) Soft-Start Time Circuit Protect Integration Time CE "High" Voltage CE "Low" Voltage SYMBOL VOUT1 VOUT2 VIN IOUTMAX IIN IDD ISTB RSWON ILXL FOSC MAXDTY PFMDTY EFFI VUVLO Tss TPRO VCEH VCEL
(VOUT=5.0V, FOSC=300kHz) CONDITIONS External components connected, VIN=output programmed voltage x 1.2, IOUT=200mA External components connected, VIN=output programmed voltage x 1.6, (when VIN 3.0V, VIN =3.0V) MIN TYP
Ta=25: MAX UNITS V V V mA 2.540 3.740 71 26 1.5 0.44 110 39 2.5 0.58 2.0 255 100 15 300 345 mA A A A A kHz % % % 1.8 10.0 5.0 16.0 8.0 V msec msec V 0.20 24 32 V
4.875 5.000 5.125 VOUT1 -0.5% 10 VOUT1 +1.5%
External components connected, VIN=output programmed voltage x 1.2, External components connected, VIN=VOUT x 1.05, No load. XC6376 XC6377
600
Only CSS connected, VIN = output programmed voltage x 1.2, VOUT= VIN, VLX=VIN Same as IDD. CE=0V Same as IDD except VOUT=output programmed voltage x0.9, VLX=VIN-0.2V, pull down LX to 10, CE=VIN Same as ISTB except VLX=0V External components connected, measuring of EXT/1 waveform, VIN=VOUT1 +0.3V, IOUT=20mA External components connected, No load. Same as VOUT 1 Only CSS connected, VIN = output programmed voltage x 0.9, CE= VIN, LX OFF voltage when VIN drops. 0.9 6.0 Only CSS connected, VIN = output programmed voltage x 1.2, Time taken for CE to become "L" when VOUT changes to 0V Only CSS connected, VIN = output programmed voltage x 1.2, VOUT=0V, Apply voltage to CE and measure EXT/1,2 "L" Only CSS connected, VIN = output programmed voltage x 1.2, VOUT=0V, Apply voltage to CE and measure EXT/1,2 "H" Only CSS connected, VIN = output programmed voltage x 1.2, CE=0V, VOUT=VIN, EXT/1,2 pull down to 200, VEXT/1,2=VIN - 0.4V Only CSS connected, VIN = output programmed voltage x 1.2, CE=VIN, VOUT=output programmed voltage x 0.9, EXT/1,2 pull up to 200, VEXT/1,2=0.4V 3.0 0.65
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25 95
35
EXT/1,2 "H" ON Resistance
REXTBH
EXT/1,2 "L" ON Resistance
REXTBL
20
26
Note 1: Refers to the oscillation frequency during PWM control. Note 2: Applies to the XC6377 series only (duty ratio when control changes to PFM) Note 3: EFFI = { [(output voltage) x (output current)] / [(input voltage) x (input current)]} x100
XC6376E, XC6376F, XC6377E, XC6377F
The following parameter is to be added:
PARAMETER VOUT Sink Current
SYMBOL IVOUTL
CONDITIONS Same as ISTB, VOUT=1.0V
MIN 1.85
TYP
MAX UNITS mA
XC6376C, XC6376F, XC6377C, XC6377F
The following parameter is to be excluded: Circuit Protect Integration Time (TPRO)
583
XC6376B103SR, XC6377B103SR
PARAMETER Output Voltage Output Voltage2 Maximum Input Voltage Maximum Output Current Input Current Supply Current (oscillation stopped) Stand-by Current Lx SW ON Resistance Lx Leak Current SYMBOL VOUT1 VOUT2 VIN IOUTMAX IIN IDD ISTB RSWON ILXL FOSC MAXDTY PFMDTY EFFI VUVLO Tss TPRO VCEH VCEL
(VOUT=3.0V(when programmed), FOSC=300kHz) CONDITIONS External components connected, VIN=3.6V, IOUT=120mA External components connected, VIN=4.8V MIN TYP
Ta=25: MAX UNITS V V V 1.320 1.950 52 26 1.5 0.69 82 39 2.5 0.94 2.0 300 345 mA mA A A A A kHz % % % 1.8 10.0 5.0 16.0 8.0 V msec msec V 0.20 38 52 V
2.940 3.000 3.060 VOUT1 -0.5% 10 500 XC6376 XC6377 VOUT1 +1.5%
External components connected, VIN=3.6V External components connected, VIN=VOUT x 1.05, No load. Only CSS connected, VIN = 3.6V FB= 1.2V, VLX=VIN Same as IDD. CE=0V Only CSS connected, VIN=3.6V, CE=VIN, LX pull down to 10 VLX=VIN - 0.2V, FB=0.9V Same as ISTB except VLX=0V
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Oscillator Frequency (Note1) Maximum Duty Ratio PFM Duty Ratio (Note2) Efficiency (Note3) Minimum Operating Voltage (UVLO Voltage) Soft-Start Time Circuit Protect Integration Time CE "High" Voltage CE "Low" Voltage
External components connected, measuring of EXT/1 waveform, 255 VIN=VOUT1 +0.3V, IOUT=20mA External components connected, No load. Same as VOUT 1 Only CSS connected. CE= VIN, FB=0.9V, LX OFF voltage when VIN drops. 0.9 6.0 Only CSS connected, VIN = 3.6V Time taken for CE to become "L" when VOUT changes to 0V Only CSS connected, VIN = 3.6V, FB=0V, Apply voltage to CE and measure EXT/1,2 "L" Only CSS connected, VIN = 3.6V, FB=0V, Apply voltage to CE and measure EXT/1,2 "H" Only CSS connected, CE=0V, VIN=3.6V, FB=1.2V, EXT/1,2 pull down to 200, VEXT/1,2=VIN - 0.4V Only CSS connected, CE=VIN, VIN=3.6V, FB=0.9V, EXT/1,2 pull up to 200, VEXT/1,2=0.4V 3.0 0.65 100 15
25 95
35
EXT/1,2 "H" ON Resistance
REXTBH
EXT/1,2 "L" ON Resistance
REXTBL
31
41
Peripherals: RFB1=400k, RFB2=200k, CFB=100pF Note 1: Refers to the oscillation frequency during PWM control. Note 2: Applies to the XC6377 series only (duty ratio when control changes to PFM) Note 3: EFFI = { [(output voltage) x (output current)] / [(input voltage) x (input current)]} x100
XC6376D, XC6376D
The following parameter is to be excluded: Circuit Protect Integration Time (TPRO)
584
1. Output Voltage Internally Set-up Type (VOUT)
External Components :
L : 22H (Sumida CR54, FOSC=300kHz) 47H (Sumida CR75, FOSC=180kHz) 10H (Sumida CR54, FOSC=500kHz) SD1 : MA2Q735 (Schottky Diode, Matsushita) CL : 10V 47F (Tantalum capacitor, Nichicon MCE) CSS : 4700pF (Ceramic capacitor, FOSC=300kHz, 180kHz) 0.01F (Ceramic capacitor, FOSC=500kHz) CIN : 16V 10F (Tantalum capacitor, Nichicon MCE) Note : Please increase capacitance value (CIN) when necessary
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2. Output Voltage Externally Set-up Type (FB)
External Components :
L : 22H (Sumida CR54, FOSC=300kHz) 47H (Sumida CR75, FOSC=180kHz) 10H (Sumida CR54, FOSC=500kHz) : MA2Q735 (Schottky Diode, Matsushita) : 10V 47F (Tantalum capacitor, Nichicon MCE) : 4700pF (Ceramic capacitor, FOSC=300kHz, 180kHz) 0.01F (Ceramic capacitor, FOSC=500kHz) : 16V 10F (Tantalum capacitor, Nichicon MCE) : Please set-up so that RFB1 / RFB2 = VOUT - 1 (VOUT = set-up output voltage) and ensure that RFB1 + RFB2 2M. N.B. In actual operation please set-up so that the FB pin will be equal to 1.0V : Please set-up so that { f = 1 / (2 x CFB x RFB1)} will be in the range of 1 ~ 20kHz (5kHz normal ) e.g. If VOUT = 3.0V then RFB1 = 400k, FFB2 = 200k, CFB = 100pF
SD1 CL CSS CIN RFB CFB
Note : Please increase capacitance value (CIN) when necessary
585
GNotes 1. Maximum Output Current IOUTMAX
The maximum output current of a step-down DC/DC converter can be calculated from the values of the switching transistor's ON resistance (RSWON), the DC resistance of the coil (DCR) and the wiring resistance between the input and output pins (RETC). IOUTMAX=(VIN - VOUT) / (RSWON + DCR + RETC) The coil's DCR value will be 0.18(max.) with the CR54 22H (catalog value). If output current should exceed the above calculated value for IOUTMAX a condition of maximum duty will exist. Please use coils and Schottky diodes that have an ample output current (IOUT) margin over the stated approved currents and check the coil's current frequency in actual operation.
2. Board Wiring
Peripherals should be located as close as possible to the IC and should be connected with low impedance traces. Note that high current levels flow through the VIN - IC - coil - VOUT line. Make the ground pattern as large as possible and connect capacitor CL between the ground pin and the VOUT pin with a low impedance.
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3. Integral Circuit Protection
Should the output voltage drop as a result of overload, the IC will operate in a maximum duty state. If the TPRO time (5 msec typ.) is exceeded the CE pin will be reset to ground level and the soft-start routine will resume. If the overload condition continues then the following steps will be repeated. Circuit protection activates - CE pin reset - soft-start routine resumes - circuit protection activates -etc. As stated, when the current drawn exceeds the maximum output current (IOUTMAX) as calculated above, maximum duty will exist. When the input/output voltage differential is minimal even a comparatively small output current will trigger the protection circuit so please be careful. For those customers who require the P-channel power MOSFET to be enabled at any time and the protect circuit to not operate during low VIN periods, versions of the series without protection are also available (XC6376C, D, F types and XC6377C, D, F types) Note : Integral circuit protection performs the basic function of informing external components of the existence of a continuous state of overload in connection with temporary drops in the level of VOUT (CE). Therefore, should output short to ground level and a state of overload continue, ample circuit protection cannot be provided. In such cases, as there is the possibility that the IC and/or the peripherals may be damaged, it is recommended that output be switched off via the CE pin.
4. Soft-start, Chip Enable Circuits (CE Pin)
In order to charge the soft-start capacitor (CSS) at the CE pin, a fixed current of about 1A has been internally set-up. Therefore, when using the CE function (stand-by operations) please be aware of the possibilites of leak current from the transistor's open collector (or open drain) connection. We recommend that a capacitor of at least 100pF be connected. Although the IC will still function with CSS omitted and the CE pin connected to the VIN pin, there exists the possibility that large overshoot input voltages and/or rush currents will occur when the power is switched on which may cause instability. The same problem may also arise if the CE pin is driven from a CMOS output , so it is recommended that the CE pin be driven from an open collector (or open drain). Should the CE pin be driven from a CMOS output however, a resistor should be fitted between the CE pin and the output and a soft-start capacitor (CSS) should be connected. Measuring operational stability is also necessary. Note : Even if the CE function is not being used, a soft-start capacitor (CSS) of more than 100pF should still be connected.
5. P-Channel Boost Circuit
Attaching a capacitor (CBST) and a diode (SD2) as displayed in the figure right, allows the gate voltage of an internal P-ch power MOSFET to be driven to a negative voltage value. Since LX SW ON resistance (RSWON) becomes smaller, the efficiency at high output currents can be improved. On the other hand, efficiency during light loads will drop due to losses as a result of CBST's charging and discharging. CBST : 2200pF (ceramic capacitor) SD2 : MA729 (Schottky diode, Matsushita) Note : The voltage between VIN and P-BST should not exceed 10V (absolute max. 12V). With higher VIN values, take such countermeasures as clamping or using a 9V Zener diode.
586
6. EXT / 1, EXT / 2 Pins
As the EXT / 1 and EXT / 2 pins are provided, external transistor drives and various application circuits can be handled. EXT / 1 follows the same timing pattern as a P-channel power MOSFET ("L" in the ON mode) whereas EXT / 2 functions in a 100 nsec blank clock timing pattern (N.B. EXT / 2 changes from "H to L" 100 nsec before EXT /1 but 100 nsec after EXT / 1 with "L to H" changes.) e.g. The drawing of large output currents can be handled by connecting an external, low ON resistance, P-ch power MOSFET. In such cases we also recommend that the FET gate be connected to EXT / 1, the source to VIN and the drain to Lx in line with the typical application circuit examples provided. The EXT /1 pin can be driven to a gate capacitance of up to 1000pF.
7. U. V. L. O Circuit
Below the minimum operating voltage (VUVLO) operations shut down and, along with the P-ch power MOSFET being set to OFF, Ext /1 and EXT /2 will be "H" . (If using an external transistor, the transistor will be set to OFF.)
8. VOUT Reset Function
A function that pulls VOUT to ground during stand-by (CE "L") is available (XC6376E). Note that this function is not available with externally set-up output voltage types (FB).
9. Capacitor CIN
Sudden current changes at ground or power supply that are common to step-down DC/DC converters during switching may cause the IC's operations to become unstable depending upon the degree to which the IC's power supply voltage changes, which in turn is affected by the wiring's impedance level. It is therefore recommended that a power supply ripple rejection use capacitor (CIN) be connected between the IC's VIN and GND pins.
5
587
(1) OUTPUT VOLTAGE vs. OUTPUT CURRENT
5
Note: CIN = 47F (Tantalum)
588
(2) EFFICIENCY vs. OUTPUT CURRENT
5
Note: CIN = 47F (Tantalum)
589
(3) OUTPUT VOLTAGE vs. AMBIENT TEMPERATURE
(4) SUPPLY CURRENT vs. AMBIENT TEMPERATURE
5
(5) STAND-BY CURRENT vs. AMBIENT TEMPERATURE
(6) LX SWITCH ON RESISTANCE vs. AMBIENT TEMPERATURE
(7) OSCILLATION FREQUENCY vs. AMBIENT TEMPERATURE
(8) PFM DUTY RATIO vs. AMBIENT TEMPERATURE
590
(9) EFFICIENCY vs. AMBIENT TEMPERATURE
(10) MINIMUM OPERATING VOLTAGE vs. AMBIENT TEMPERATURE
(11) SOFT START TIME vs. AMBIENT TEMPERATURE
(12) CE "L" VOLTAGE vs. AMBIENT TEMPERATURE
5
(13) CE "H" VOLTAGE vs. AMBIENT TEMPERATURE
591
(14) LOAD TRANSIENT RESPONSE
5
592
1. Large Current Output Circuit (P-channel power MOSFET external)
External Components : L SD1 CL CSS CIN Tr :22H(Sumida CR54,FOSC = 300kHz) :U2FWJ44N(Diode, Toshiba) :10V 47F+47F(Tantalum capacitor, Nichicon MCE) :4700pF(Ceramic capacitor) :16V 47F(Tantalum capacitor, Nichicon MCE) or 0.1F (Ceramic capacitor) :XP162A11C0RR or XP132A1275SR (Torex)
5
Note:In order to reduce impedance we recommend use of a capacitor (CIN) with a large capacitance value or a ceramic capacitor with a low ESR value. Please insert a by-pass capacitor of more than 0.1F between pin Numbers 1 and 3.
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