LTC3547B
16
3547bfb
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 0807 REV B • PRINTED IN USA
TYPICAL APPLICATIO
U
RELATED PARTS
VIN
RUN2 RUN1
LTC3547B
VFB2
SW2 SW1
VFB1
CF2, 10pF CF1, 10pF
GND
VIN
2.5V TO 5.5V
VOUT2
1.8V AT 300mA
VOUT1
2.5V AT 300mA
3547b TA02
R3
280k
R1
280k
R4
562k
L2
4.7μH
L1
4.7μH
R2
887k
COUT2
4.7μF
C1
4.7μF
COUT1
4.7μF
C1, COUT1, COUT2: TAIYO YUDEN JMK316BJ475ML
L1, L2: MURATA LQH32CN4R7M33
PART NUMBER DESCRIPTION COMMENTS
LTC1877 600mA (IOUT), 550kHz, Synchronous Step-Down
DC/DC Converter
95% Effi ciency, VIN: 2.7V to 10V, VOUT = 0.8V, IQ = 10μA,
ISD <1μA, MS8 Package
LTC1878 600mA (IOUT), 550kHz, Synchronous Step-Down
DC/DC Converter
95% Effi ciency, VIN: 2.7V to 6V, VOUT = 0.8V, IQ = 10μA, ISD <1μA,
MS8 Package
LTC1879 1.2A (IOUT), 550kHz, Synchronous Step-Down DC/DC
Converter
95% Effi ciency, VIN: 2.7V to 10V, VOUT = 0.8V, IQ = 15μA,
ISD <1μA, TSSOP-16 Package
LTC3403 600mA (IOUT), 1.5MHz, Synchronous Step-Down
DC/DC Converter with Bypass Transistor
96% Effi ciency, VIN: 2.5V to 5.5V, VOUT = Dynamically Adjustable,
IQ = 20μA, ISD <1μA, DFN Package
LTC3404 600mA (IOUT), 1.4MHz, Synchronous Step-Down
DC/DC Converter
95% Effi ciency, VIN: 2.7V to 6V, VOUT = 0.8V, IQ = 10μA,
ISD <1μA, MS8 Package
LTC3405/LTC3405A 300mA (IOUT), 1.5MHz, Synchronous Step-Down
DC/DC Converter
96% Effi ciency, VIN: 2.5V to 5.5V, VOUT = 0.8V, IQ = 20μA,
ISD <1μA, ThinSOT™ Package
LTC3406 600mA (IOUT), 1.5MHz, Synchronous Step-Down
DC/DC Converter
96% Effi ciency, VIN: 2.5V to 5.5V, VOUT = 0.6V, IQ = 20μA,
ISD <1μA, ThinSOT Package
LTC3409 600mA (IOUT), 1.5MHz/2.25MHz, Synchronous
Step-Down DC/DC Converter
95% Effi ciency, VIN: 1.6V to 5.5V, VOUT = 0.613V, IQ = 65μA,
DD8 Package
LTC3410 300mA (IOUT), 2.25MHz, Synchronous Step-Down
DC/DC Converter
96% Effi ciency, VIN: 2.5V to 5.5V, VOUT(MIN) = 0.8V, IQ = 26μA,
ISD <1μA, SC70 Package
LTC3411 1.25A (IOUT), 4MHz, Synchronous Step-Down
DC/DC Converter
95% Effi ciency, VIN: 2.5V to 5.5V, VOUT = 0.8V, IQ = 60μA,
ISD <1μA, MS Package
LTC3412 2.5A (IOUT), 4MHz, Synchronous Step-Down
DC/DC Converter
95% Effi ciency, VIN: 2.5V to 5.5V, VOUT = 0.8V, IQ = 60μA,
ISD <1μA, TSSOP-16E Package
LTC3440 600mA (IOUT), 2MHz, Synchronous Buck-Boost
DC/DC Converter
95% Effi ciency, VIN: 2.5V to 5.5V, VOUT = 2.5V, IQ = 25μA,
ISD <1μA, MS Package
LTC3547 Dual 300mA (IOUT), 2.25MHz, Synchronous
Step-Down DC/DC Converter
96% Effi ciency, VIN: 2.5V to 5.5V, VOUT = 0.6V, IQ = 40μA,
ISD <1μA, DFN Package
ThinSOT is a trademark of Linear Technology Corporation
Dual 300mA Buck Converter with Pulse Skip Mode
VIN
RUN2 RUN1
LTC3547B-1
VFB2
SW2 SW1
VFB1
GND
VIN
2.5V TO 5.5V
VOUT2
1.2V AT 300mA
VOUT1
1.8V AT 300mA
3547b TA03
L2
4.7μH
L1
4.7μH
COUT2
4.7μF
C1
4.7μF
COUT1
4.7μF
C1, COUT1, COUT2: TAIYO YUDEN JMK316BJ475ML
L1, L2: MURATA LQH32CN4R7M33
1.8V/1.2V Dual 300mA Buck Converter with Pulse Skip Mode