LTC3520
24
3520fa
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2007
LT 0609 REV A • PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATION
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 Packages
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 and DFN Packages
LTC3441 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% Effi ciency, 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
DC/DC Converter
V
IN
: 2.75V to 5.5V, V
OUT(RANGE)
: 0.5V to 5V, I
SD
< 1μA, DFN Package
LTC3455 Dual DC/DC Converter with USB Power
Manager and Li-Ion Battery Charger
96% Effi ciency, 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% Effi ciency, Seamless Transition Between Inputs, I
Q
= 180μA, I
SD
< 1μA, QFN Package
LTC3522 400mA (I
OUT
) Synchronous Buck-Boost
and 200mA Buck DC/DC Converters
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
LTC3530 600mA (I
OUT
), 2MHz Synchronous Buck-
Boost DC/DC Converter
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-
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 and
MSOP Packages
LTC3548 400mA/800mA, 2.25MHz Dual
Synchronous Step-Down DC/DC Converter
95% Effi ciency, V
IN
: 2.5V to 5.5V, V
OUT(MIN)
= 0.6V, I
Q
= 40μA, I
SD
< 1μA, DFN and
MSOP Packages
3520 TA04
SW1A
SW1B
V
OUT1
A
OUT
A
IN
V
C1
FB1
SS1
SV
IN
PV
IN3
PV
IN2
PV
IN1
PGND2SGNDPGND1
SW2
FB2
SS2
R
T
PWM1
PWM2
SD3
SD2
SD1
C3
22μF
1M
750k
309k
15k
470pF
10k
56pF
LTC3520
V
OUT
3.3V
500mA
1A FOR V
IN
≥ 3V
V
OUT
1.8V
600mA
V
IN
2.2V TO 4.2V
V
IN
LOW BATTERY OUTPUT
(ACTIVE LOW)
THRESHOLD = 2.3V
C1, C2, C3: TAIYO YUDEN CERAMIC
JMK212BJ226MG-T
L1: TDK RLF7030T-4R7M3R4 4.7μH
L2: TDK RLF7030T-3R3M4R 3.3μH
C2
22μF
3.3nF
3.3nF
54.9k
255k
200k
301k
C1
22μF
Li-Ion
L2
3.3μH
L1
4.7μH
392k
BAT_LOW
27pF
PWM
BURST
ON
OFF
Li-Ion to 3.3V at 500mA and 1.8V at 600mA
with Low Battery Detection
