LTC3561A
20
3561afa
For more information www.linear.com/LTC3561A
LINEAR TECHNOLOGY CORPORATION 2008
LT 0514 REV A • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com/LTC3561A
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
LTC3406/LTC3406B 600mA (I
OUT
), 1.5MHz Synchronous Step-Down DC/DC Converters 96% Efficiency, V
IN
: 2.5V to 5.5V, V
OUT(MIN)
= 0.6V,
I
Q
= 20µA, I
SD
< 1µA, ThinSOT
™
LTC3407/LTC3407-2
LTC3407-3/LTC3407-4
LTC3407A/LTC3407A-2
Dual 600mA/800mA (I
OUT
), 1.5MHz/2.25MHz Synchronous
Step-Down DC/DC Converters
95% Efficiency, V
IN
: 2.5V to 5.5V, V
OUT(MIN)
= 0.6V,
I
Q
= 40µA, I
SD
< 1µA, MS10E, DFN
LTC3410/LTC3410B 300mA (I
OUT
), 2.25MHz Synchronous Step-Down DC/DC
Converters
95% Efficiency, V
IN
: 2.5V to 5.5V, V
OUT(MIN)
= 0.8V,
I
Q
= 26µA, I
SD
< 1µA, SC70
LTC3411A 1.25A (I
OUT
), 4MHz Synchronous Step-Down DC/DC Converter 96% Efficiency, V
IN
: 2.6V to 5.5V, V
OUT(MIN)
= 0.8V,
I
Q
= 60µA, I
SD
< 1µA, MS10, 3mm × 3mm DFN
LTC3412A 2.5A (I
OUT
), 4MHz Synchronous Step-Down DC/DC Converter 96% Efficiency, V
IN
: 2.6V to 5.5V, V
OUT(MIN)
= 0.8V,
I
Q
= 62µA, I
SD
< 1µA, TSSOP16E, 4mm × 4mm QFN
LTC3531/LTC3531-3
LTC3531-3.3
200mA (I
OUT
), 1.5MHz Synchronous Buck-Boost DC/DC Converters 95% Efficiency, V
IN
: 1.8V to 5.5V, V
OUT(MIN)
= 2V to 5V,
I
Q
= 16µA, I
SD
< 1µA, ThinSOT, DFN
LTC3532 500mA (I
OUT
), 2MHz Synchronous Buck-Boost DC/DC Converter 95% Efficiency, V
IN
: 2.4V to 5.5V, V
OUT(MIN)
= 2.4V to 5.25V,
I
Q
= 35µA, I
SD
< 1µA, MS10, DFN
LTC3542 500mA (I
OUT
), 2.25MHz Synchronous Step-Down DC/DC Converter 95% Efficiency, V
IN
: 2.5V to 5.5V, V
OUT(MIN)
= 0.6V,
I
Q
= 26µA, I
SD
< 1µA, 2mm × 2mm DFN
LTC3544 Quad 300mA + 2× 200mA + 100mA, 2.25MHz Synchronous
Step-Down DC/DC Converter
95% Efficiency, V
IN
: 2.5V to 5.5V, V
OUT(MIN)
= 0.8V,
I
Q
= 70µA, I
SD
< 1µA, 3mm × 3mm QFN
LTC3547/LTC3547B Dual 300mA, 2.25MHz Synchronous Step-Down DC/DC Converters 96% Efficiency, V
IN
: 2.5V to 5.5V, V
OUT(MIN)
= 0.6V,
I
Q
= 40µA, I
SD
< 1µA, 2mm × 3mm DFN
LTC3548/LTC3548-1
LTC3548-2
Dual 400mA/800mA, (I
OUT
), 2.25MHz Synchronous Step-Down DC/
DC Converters
95% Efficiency, V
IN
: 2.5V to 5.5V, V
OUT(MIN)
= 0.6V,
I
Q
= 40µA, I
SD
< 1µA, MS10E, DFN
LTC3560 800mA (I
OUT
), 2.25MHz Synchronous Step-Down DC/DC Converter 95% Efficiency, V
IN
: 2.5V to 5.5V, V
OUT(MIN)
= 0.6V,
I
Q
= 16µA, I
SD
< 1µA, ThinSOT
TYPICAL APPLICATIONS
1mm Height, 2MHz, Li-Ion to 1.8V Converter
Efficiency vs Output Current
PV
IN
LTC3561A
SW
SV
IN
V
FB
I
TH
SHDN/R
T
L1
0.9µH
V
OUT
1.8V
AT 1A
IN
2.5V
TO 4.2V
SGND PGND
C4 22pF
R4
178k
R3
16.9k
R1
200k
R2
249k
3561A TA04a
C3
470pF
C2
10µF
×2
C1
10µF
C1, C2: TAIYO YUDEN JMK107BJ106MA
L1: FDK MIPW3226DORGM
OUTPUT CURRENT (mA)
30
EFFICIENCY (%)
90
20
10
80
50
70
60
40
1 100 1000 10000
3561A TA04b
0
10
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 30mA TO 1A
V
OUT
100mV/DIV
AC COUPLED
I
L
1A/DIV
3561A TA04c
40µs/DIV
I
LOAD
1A/DIV
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 200mA TO 1A
3561A TA04d
40µs/DIV
V
OUT
100mV/DIV
AC COUPLED
I
L
1A/DIV
I
LOAD
1A/DIV
