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Preliminary
RT9267
High Efficiency, Low Quiescent, Triple Output DC-DC Converter
General Description
The RT9267 is a triple output DC-DC converter IC including two adaptive PWM controllers, one low dropout regulator, and one voltage detector. RT9267 is capable of delivering hundreds of mA output current and consumes only 40A quiescent current for the whole IC. The adaptive PWM controllers are configured for boost applications with built-in 2A NMOS for each channel. The proprietary adaptive PWM loop provides PWM operation for heavier output loading conditions and PFM for lighter loading, with seamless auto-transition. The 550kHz switching rate reduces the size of external passive components. The low dropout linear regulator (LDO) is designed with a built-in 300mA PMOS, providing 1mV/mA low dropout voltage with respect to variant output current values. The voltage detector provides the supervisory function with open collector pull-low output. All the 4 function units are adjustable, and each can be set with two resistors in divider connection. The reference voltage for each channel is set to 1.25V for the two adaptive PWM controllers, and 0.86V for the LDO and the voltage detector. The RT9267 is in TSSOP 16 pin package which fits spacelimited hand held devices well.
Features
Two Channels of Adaptive PWM Controllers One Channel of Low Dropout Regulator One Voltage Detector Low Start-Up Voltage 1.0V Low Quiescent Current 40A for the Whole IC High Switching Rate 550kHz Built-In 2A Switching NMOS Two Separated Chip Enable Control Pins 2% Accuracy for All Channels Minimized External Components Small TSSOP-16 Package RoHS Compliant and 100% Lead (Pb)-Free
Applications
PDA Portable Instrument Wireless Equipment DSC LCD Back Bias Circuit RF-Tags
Pin Configurations
(TOP VIEW)
LX1 EN1 GND EN2 NC LX2 NC GND 16 15 14 13 12 11 10 9 VDD FB1 LFB NC LDOO FB2 LBI LBO
Ordering Information
RT9267 Package Type C : TSSOP-16 Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commercial Standard)
2 3 4 5 6 7 8
TSSOP-16
Note : RichTek Pb-free and Green products are : RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020. Suitable for use in SnPb or Pb-free soldering processes. 100%matte tin (Sn) plating.
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RT9267
Typical Application Circuit
Preliminary
VIN (1.1V to 3.3V)
+
C1 1uF Chip Enable 2.5V
+
C10 100uF
16 VDD 2 4 12 CE1 CE2 LDOO RT9267 14 10 9 LFB LBI LBO LX2 NC NC NC GND 8 FB2 GND 3 11 R7 1.5M Q1 N MOS FB1 LX1 1 15 R5 1.6M R6 980k C4 100pF
L1 4.7uH
D1 3.3V
+
1N5819 L2 10uH
C6 100uF
C7 1uF
C2 10uF
R1 1.3M R2 680k
C3 100pF
D2 18V
+
1N5819
C8 100uF
C9 1uF
6
R3
5 7 R4 13
C5 0.1uF
R8 112k
Low Battery Warning Output (Poen Collector)
Functional Pin Description
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Pin Name LX1 EN1 GND EN2 NC LX2 NC GND LBO LBI FB2 LDOO NC LFB FB1 VDD
st st
Pin Function The Switching Pin for 1 PWM Converter Enable Pin for 1 PWM Converter and LDO. (Active High) Ground (Both Pin3 and Pin8 should be connected) Enable Pin for 2 Not Connected The Switching Pin for 2 Not Connected Ground (Both Pin3 and Pin8 should be connected) NMOS Open Drain Output of the Voltage Detector. This pin will internally pulled low when the voltage at LBI pin below 0.86V. Input Pin for Voltage Detector. The trip point is 0.86V. Feedback Input Pin for 2 Not Connected Feedback Pin for the LDO. Internal VREF for the error amplifier is 0.86V Feedback Input Pin for 1 PWM Converter. Internal VREF for the error amplifier is 1.25V Input Positive Power Pin of RT9267, and also the Voltage Input Pin for LDO.
st nd nd nd
PWM Converter and Voltage Detector. (Active High)
PWM Converter
PWM Converter. Internal VREF for the error amplifier is 1.25V.
Voltage Output Pin for the LDO.
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DS9267-08 March 2007
Preliminary Function Block Diagram
VDD VDD Q2 P MOS LDO O LFB FB1 1.25V VDD R2 Shut Down EN1 Q3 N MOS
Over Temp. Detector
RT9267
1st PWM and LDO controlled with CE1 + 0.86V
1st PWM converter
+ Loop Control Circuit Q1 N MOS R1
LX1
2nd PWM and Voltage Detector controlled with CE2 LBI LBO Q2 N MOS + 0.86V
2nd PWM converter
FB2 1.25V VDD R2 Shut Down EN2 Q3 N MOS
Over Temp. Detector
LX2 Q1 N MOS R1
+ Loop Control Circuit
GND
Absolute Maximum Ratings
Supply Voltage ------------------------------------------------------------------------------------------------------ -0.3V to 7V LX Pin Switch Voltage --------------------------------------------------------------------------------------------- -0.3V to (VDD + 0.8V) LDO Output Voltage ----------------------------------------------------------------------------------------------- -0.3V to (VDD + 0.3V) Other I/O Pin Voltages -------------------------------------------------------------------------------------------- -0.3V to (VDD + 0.3V) LX Pin Switch Current --------------------------------------------------------------------------------------------- 2.5A EXT Pin Driver Current --------------------------------------------------------------------------------------------- 30mA LBO Current --------------------------------------------------------------------------------------------------------- 30mA Power Dissipation, PD @ TA = 25C TSSOP-16 ------------------------------------------------------------------------------------------------------------ 600mW Operating Junction Temperature -------------------------------------------------------------------------------- 150C Storage Temperature Range ------------------------------------------------------------------------------------- -65C to +150C
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RT9267
Electrical Characteristics
Preliminary
(VIN = 5V, CIN = COUT = 1F, TA = 25C, unless otherwise specified)
Parameter Section for Adaptive PWM Converters Start-Up Voltage Operating VDD Range Feedback Reference Voltage Switching Rate Maximum Duty LX ON Resistance Current Limit Setting No Load Current (VIN) Switch-off Current (VDD) Line Regulation Load Regulation Section for LDO LDO PMOS ON Resistance LDO Drop Out Voltage
Symbol
Test Conditions
Min
Typ
Max
Units
VST VDD VREF FS DMAX
IL = 1mA Start-up to IDD > 250A Close Loop, VDD = 3.3V VDD = 3.3V VDD = 3.3V VDD = 3.3V
-0.8 1.225 ---------
0.98 -1.25 550 92 0.25 2 47 17 10 0.25
1.05 6.5
*
V V V kHz % A A A mV/V mV/mA mV V V
1.275 ---------
ILIMIT INO LOAD VLINE VLOAD
VDD = 3.3V VIN = 1.5V, VOUT = 3.3V
ISWITCH OFF VIN = 6V VIN = 1.5 ~ 2.5V, IL = 1mA VIN = 2.5V, IL = 1 ~ 100mA
VDD = 3.3V VDROP VDD = 3.3V, IL = 100mA Close Loop, VDD = 3.3V
--0.843
1 100 0.86
1.5 -0.877
Feedback Reference Voltage for LDO VREF Section for Voltage Detector LBO ON Resistance LBI Pin Trip Point Section for Whole Chip Property Operating VDD Range Shutdown Current (VIN) EN Pin Trip Level Temperature Stability for FB, LFB, LBI TS Thermal Shutdown TSD VDD IOFF
VDD = 3.3V VDD = 3.3V Start-up to IDD1 > 250A EN1 = EN2 = 0, VIN = 4.5V VDD = 3.3V Guaranteed by Design
-0.843
40 0.86
-0.877
0.8 -0.4 ---
-0.1 1.0 40 165
6 1 1.4 ---
V A V ppm/C C
* Note. The EN pin shall be tied to VDD pin and inhibit to act the ON/OFF state whenever the VDD pin voltage may reach to 5.5V or above, in case that VDD pin is conducted from VIN.
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DS9267-08 March 2007
Preliminary Typical Operating Characteristics
Feedback Voltage vs. Temperature
1.262
RT9267
LX Pin On Resistance vs. VDD Pin Voltage
4.5
LX Pin On Resistance ()
2nd PWM
1.260
4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0
Feedback Voltage (V)
LX1 Pin LX2 Pin
1.258 1.256 1.254 1.252
1st PWM
VDD = 3.3V
1.250 -40 -20 0 20 40 60 80
TA = 25C
0 1 2 3 4 5 6
Temperature (C)
VDD Pin Voltage (V)
Switching Frequency vs. VDD Pin Voltage
1000
Switching Frequency vs. Temperature
580
Switching Frequency(kHz) A
Switching Frequency(KHz) .
900 800 700 600 500 400 300 200 100 0 0 1 2 3 4 5 6
560 540 520 500 480
1st PWM
2nd PWM
1st PWM
2nd PWM
FB1 = FB2 = GND TA = 25C
VDD = 3.3V
460 -40 -20 0 20 40 60 80
VDD Pin Voltage(V)
Temperature (C)
Total Input Current (IIN) vs. Input Voltage
1600 1400
Efficiency vs. Output Current
95
VIN = 3.2V
90
VIN = 2.8V
Input Current (uA)
1200 1000 800 600 400 200 0 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2
Efficiency (%)
85
VIN = 1.8V
80
VIN = 2.0V
75
VOUT1 = 3.3V, VOUT2 = 18V @ No Load ( Refer to Typical Application Circuit )
70 1
VOUT = 3.3V TA = 25C
10
VIN = 2.4V
100
1000
Input Voltage (V)
DS9267-08 March 2007
Output Current (mA)
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RT9267
LX & Output Ripple
6
Preliminary
LX & Output Ripple
6 4 2 0
LX (V)
2 0
Output Ripple (mV)
Output Ripple (mV)
LX (V)
4
200 0 -200
200 0 -200 0 1 2 3 VIN = 1.8V, VOUT = 3.3V @ 200mA 4 5 6 7 8 9
VIN = 1.8V, VOUT = 3.3V @ 10mA 0 5 10 15 20 25 30 35 40 45 50
10
Time (s)
Time (s)
LX & Output Ripple
6 6 4 2 0 4 2 0
LX & Output Ripple
LX (V)
LX (V)
Output Ripple (mV)
200 0 -200 VIN = 2.0V, VOUT = 3.3V @ 10mA 0 5 10 15 20 25 30 35 40 45
Output Ripple (mV)
200 0 -200 0 1 2 3
VIN = 2.0V, VOUT = 3.3V @ 300mA 4 5 6 7 8 9 10
50
Time (s)
Time (s)
LX & Output Ripple
6 6
LX & Output Ripple
4 2 0
LX (V)
2 0
LX (V)
4
Output Ripple (mV)
Output Ripple (mV)
200 0 -200
200 0 -200 VIN = 2.4V, VOUT = 3.3V @ 550mA 0 2.5 5.0 7.5 10 12.5 15
VIN = 2.4V, VOUT = 3.3V @ 10mA 0 10 20 30 40 50 60 70 80 90 100
17.5 20 22.5 25
Time (s) www.richtek.com 6
Time (s) DS9267-08 March 2007
Preliminary
RT9267
LX & Output Ripple
6 4 2 0
LX & Output Ripple
6 4 2 0
LX (V)
Output Ripple (mV)
Output Ripple (mV)
200 0 -200 0 25 50 VIN = 2.8V, VOUT = 3.3V @ 10mA
LX (V)
200 0 -200 0 VIN = 2.8V, VOUT = 3.3V @ 300mA 2.5 5.0 7.5 10 12.5 15
75 100 125 150 175 200 225 250
17.5 20 22.5 25
Time (s)
Time (s)
LX & Output Ripple
6 6 4 2 0 4 2 0
LX & Output Ripple
LX (V)
Output Ripple (mV)
200 0 -200 VIN= 3.2V, VOUT = 3.3V @ 10mA 0 50 100 150 200 250 300 350 400 450 500
Output Ripple (mV)
LX (V)
200 0 -200 0
VIN = 3.2V, VOUT = 3.3V @ 300mA 2.5 5.0 7.5 10 12.5 15 17.5 20 22.5 25
Time (s)
Time (s)
Transient Response
Output Transient Output Transient Voltage (mV)
100 50 0 VIN = 2V, VOUT = 3.3V IOUT = 10mA to 300mA
Transient Response
Voltage (mV)
300 200 100 0 VIN = 3V, VOUT = 3.3V IOUT = 10mA to 300mA
150
Output Current (mA)
Output Current (mA)
400 200 0
400 200 0
Time (250s/Div) DS9267-08 March 2007
Time (250s/Div) www.richtek.com 7
RT9267
LDO Transient Response
Output Transient
Preliminary
LDO Transient Response
Output Transient
400
400
Voltage (mV)
200 0 -200
VIN = 2V, VOUT = 2.5V IOUT = 10mA to 100mA
Voltage (mV)
200 0 -200
VIN = 3V, VOUT = 2.5V IOUT = 10mA to 100mA
Output Current (mA)
100 50 0
Output Current (mA)
100 50 0
0
2.5 5.0 7.5
10 12.5 15 17.5 20 22.5 25
0
2.5 5.0 7.5
10 12.5 15
17.5 20 22.5 25
Time (ms)
Time (ms)
LDO Dropout Voltage vs. Output Current
350 300 250 200 150 100 50 0 0 50 100 150 200 250 300
LDO Dropout Voltage (mV)
Output current (mA)
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Preliminary Outline Dimension
D L
RT9267
E
E1
e
A A1 b
A2
Symbol A A1 A2 b D e E E1 L
Dimensions In Millimeters Min 1.000 0.050 0.800 0.190 4.900 0.650 6.200 4.300 0.450 6.600 4.500 0.750 Max 1.200 0.150 1.050 0.300 5.100
Dimensions In Inches Min 0.039 0.002 0.031 0.007 0.193 0.026 0.244 0.169 0.018 0.260 0.177 0.030 Max 0.047 0.006 0.041 0.012 0.201
16-Lead TSSOP Plastic Package
Richtek Technology Corporation
Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611
Richtek Technology Corporation
Taipei Office (Marketing) 8F, No. 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek.com
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