LTC3520 Datasheet, PDF (24/24 Pages) Linear Technology – Synchronous 1A Buck-Boost and 600mA Buck Converters

LTC3520
TYPICAL APPLICATION
V_IN
2.2V TO 4.2V
Li-Ion to 3.3V at 500mA and 1.8V at 600mA
with Low Battery Detection
V_OUT
1.8V
600mA
Li-Ion
255k
C2
22µF
200k
PWM
BURST
C1, C2, C3: TAIYO YUDEN CERAMIC
JMK212BJ226MG-T
L1: TDK RLF7030T-4R7M3R4 4.7µH
L2: TDK RLF7030T-3R3M4R 3.3µH
ON
OFF
C1
22µF
L2
3.3µH
27pF
3.3nF
54.9k
301k
PV_IN1 PV_IN2 PV_IN3 SV_IN SW1A
SW1B
SW2
V_OUT1
V_C1
FB2
SS2
R_T
PWM1
PWM2
LTC3520
FB1
SS1
A_IN
A_OUT
L1
4.7µH
470pF
56pF
15k 10k
3.3nF
BAT_LOW
1M
309k
SD3
SD2
SD1
PGND1 SGND PGND2
LOW BATTERY OUTPUT
(ACTIVE LOW)
THRESHOLD = 2.3V
3520 TA04
V_OUT
3.3V
C3
22µF
500mA
1A FOR
V_IN ≥
3V
V_IN
750k
392k
RELATED PARTS
PART NUMBER
LTC3410/
LTC3410B
LTC3440
LTC3441
DESCRIPTION
COMMENTS
300mA (I_OUT), 2.25MHz Synchronous Buck V_IN: 2.5V to 5.5V, V_OUT(RANGE): 0.8V to V_IN, I_Q = 26µA, I_SD < 1µA, SC70 Packages
DC/DC Converter
600mA (I_OUT), 2MHz Synchronous Buck- V_IN: 2.5V to 5.5V, V_OUT(RANGE): 2.5V to 5.5V, I_Q = 25µA, I_SD < 1µA, MS and DFN Packages
Boost DC/DC Converter
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 = 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
LTC3443
600kHz, 1.2A, Synchronous Buck-Boost
DC/DC Converter
95% Efficiency, V_IN: 2.4V to 5.5V, V_OUT(RANGE): 2.4V to 5.25V, I_Q = 25µA, I_SD < 1µA, DFN
Package
LTC3444
1.5MHz, 400mA, Synchronous Buck-Boost V_IN: 2.75V to 5.5V, V_OUT(RANGE): 0.5V to 5V, I_SD < 1µA, DFN Package
DC/DC Converter
LTC3455
Dual DC/DC Converter with USB Power
Manager and Li-Ion Battery Charger
96% Efficiency, Seamless Transition Between Inputs, I_Q = 110µA, I_SD < 2µA, QFN Package
LTC3456
Two Cell Multi-Output DC/DC Converter
with USB Power Manager
92% Efficiency, Seamless Transition Between Inputs, I_Q = 180µA, I_SD < 1µA, QFN Package
LTC3522
LTC3530
400mA (I_OUT) Synchronous Buck-Boost
and 200mA Buck DC/DC Converters
600mA (I_OUT), 2MHz Synchronous Buck-
Boost DC/DC Converter
V_IN: 2.4V to 5.5V, Buck-Boost V_OUT(RANGE): 2.2V to 5.25V, Buck V_OUT(RANGE): 0.6V to V_IN,
I_Q = 25µA, 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 and
MSOP Packages
LTC3532
500mA (I_OUT), 2MHz Synchronous Buck- V_IN: 2.4V to 5.5V, V_OUT(RANGE): 2.4V to 5.25V, I_Q = 35µA, I_SD < 1µA, DFN and
Boost DC/DC Converter
MSOP Packages
LTC3548
400mA/800mA, 2.25MHz Dual
95% Efficiency, V_IN: 2.5V to 5.5V, V_OUT(MIN) = 0.6V, I_Q = 40µA, I_SD < 1µA, DFN and
Synchronous Step-Down DC/DC Converter MSOP Packages
3520f
24 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
LT 0807 • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2007