LTC3522_15 Datasheet, PDF (20/20 Pages) Linear Technology – Synchronous 400mA Buck-Boost and 200mA Buck Converters

LTC3522
TYPICAL APPLICATION
3V at 400mA and 1.8V at 200mA with Sequenced Start-Up
V_IN
2.4V TO 4.2V ₊
Li-Ion
V_OUT2
1.8V
200mA
499k
C1
6.8μF
C3
4.7μF
L1
8.2μH
12pF _137k
68.1k
PGOOD1
PWM
BURST
C1: TDK C3216X5R0J685M
C2, C3: TAIYO YUDEN JMK212BJ106MG
L1: COOPER BUSSMANN SD18-8R2
L2: COOPER BUSSMANN SD18-4R7
PV_IN1 PV_IN2
SW2
SW1A
L2
4.7μH
SW1B
LTC3522
FB2
V_OUT1
1M
FB1
499k
PGOOD1
SHDN2
PWM
PGOOD2
SHDN1
PGND1 GND1 PGND2
499k
3522 TA03A
V_OUT1
3V
C2 ^300mA
4.7μF ^{(400mA, VIN > 3V)}
ON
OFF
Sequenced Start-Up Waveforms
V_OUT2
1V/DIV
V_OUT1
2V/DIV
PGOOD2
5V/DIV
PGOOD1
5V/DIV
200μs/DIV
3522 TA03b
RELATED PARTS
PART NUMBER DESCRIPTION
COMMENTS
LTC3410/LTC3410B 300mA (I_OUT), 2.25MHz Synchronous Buck DC/DC Converter V_IN: 2.5V to 5.5V, V_OUT(RANGE) = 0.8V to V_IN, I_Q = 26μA, I_SD < 1μA,
SC70 Package
LTC3440
600mA (I_OUT), 2MHz Synchronous Buck-Boost
DC/DC Converter
V_IN: 2.5V to 5.5V, V_OUT(RANGE) = 2.5V to 5.5V, I_Q = 25μA, I_SD < 1μA,
MS, DFN Packages
LTC3441
600mA (I_OUT), 2MHz Synchronous Buck-Boost
DC/DC Converter
V_IN: 2.5V to 5.5V, V_OUT(RANGE) = 2.4V to 5.25V, I_Q = 25μA, I_SD < 1μA,
DFN Package
LTC3442
1.2A (I_OUT), 2MHz Synchronous Buck-Boost
DC/DC Converter
V_IN: 2.4V to 5.5V, V_OUT(RANGE) = 2.4V to 5.25V, I_Q = 35μA, I_SD < 1μA,
DFN Package
LTC3455
LTC3456
LTC3530
Dual DC/DC Converter with USB Power Manager and Li-Ion
Battery Charger
2-Cell Multi-Output DC/DC Converter with USB Power
Manager
600mA (I_OUT), 2MHz Synchronous Buck-Boost
DC/DC Converter
96% Efficiency, Seamless Transition Between Inputs, I_Q = 110μA,
I_SD < 2μA, QFN Package
92% Efficiency, Seamless Transition Between Inputs, I_Q = 180μA,
I_SD < 1μA, QFN Package
V_IN: 1.8V to 5.5V, V_OUT(RANGE) = 1.8V to 5.5V, I_Q = 40μA, I_SD < 1μA,
DFN, MSOP Packages
LTC3532
500mA (I_OUT), 2MHz Synchronous Buck-Boost
DC/DC Converter
V_IN: 2.4V to 5.5V, V_OUT(RANGE) = 2.4V to 5.25V, I_Q = 35μA, I_SD < 1μA,
DFN, MSOP Packages
LTC3544/LTC3544B 300mA, 200mA ×2, 100mA, 2.25MHz Quad Output
Synchronous Step-Down DC/DC Converter
V_IN: 2.25V to 5.5V, V_OUT(MIN) = 0.8V, I_Q = 70μA, I_SD < 1μA,
3mm × 3mm QFN Packages
3522fa
20 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
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LT 0807 REV A • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2007