LTC3548
16
3548fc
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2005
LT 0709 REV C • PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATION
PART NUMBER DESCRIPTION COMMENTS
LTC1878 600mA (I
OUT
), 550kHz,
Synchronous Step-Down DC/DC Converter
95% Effi ciency, V
IN
: 2.7V to 6V, V
OUT(MIN)
= 0.8V, I
Q
= 10μA,
I
SD
< 1μA, MSOP-8 Package
LT1940 Dual Output 1.4A (I
OUT)
, Constant 1.1MHz,
High Effi ciency Step-Down DC/DC Converter
V
IN
: 3V to 25V, V
OUT(MIN)
= 1.2V, I
Q
= 2.5mA, I
SD
= < 1μA,
TSSOP-16E Package
LTC3252 Dual 250mA (I
OUT
), 1MHz, Spread Spectrum
Inductorless Step-Down DC/DC Converter
88% Effi ciency, V
IN
: 2.7V to 5.5V, V
OUT(MIN)
= 0.9V to 1.6V,
I
Q
= 60μA, I
SD
< 1μA, DFN-12 Package
LTC3405/LTC3405A 300mA (I
OUT
), 1.5MHz,
Synchronous Step-Down DC/DC Converters
96% Effi ciency, V
IN
: 2.5V to 5.5V, V
OUT(MIN)
= 0.8V, I
Q
= 20μA,
I
SD
< 1μA, ThinSOT Package
LTC3406/LTC3406B 600mA (I
OUT
), 1.5MHz,
Synchronous Step-Down DC/DC Converters
96% Effi ciency, V
IN
: 2.5V to 5.5V, V
OUT(MIN)
= 0.6V, I
Q
= 20μA,
I
SD
< 1μA, ThinSOT Package
LT3407/LT3407-2 600mA/1.5MHz, 800mA/2.25MHz
Dual Synchronous Step-Down DC/DC Converter
96% Effi ciency, V
IN
: 2.5V to 5.5V, V
OUT(MIN)
= 0.6V, I
Q
= 40μA,
I
SD
< 1μA, MSE, DFN Package
LTC3411 1.25A (I
OUT
), 4MHz,
Synchronous Step Down DC/DC Converter
95% Effi ciency, V
IN
: 2.5V to 5.5V, V
OUT(MIN)
= 0.8V, I
Q
= 60μA,
I
SD
< 1μA, MSOP-10 Package
LTC3412 2.5A (I
OUT
), 4MHz,
Synchronous Step Down DC/DC Converter
95% Effi ciency, V
IN
: 2.5V to 5.5V, V
OUT(MIN)
= 0.8V, I
Q
= 60μA,
I
SD
< 1μA, TSSOP-16E Package
LTC3414 4A (I
OUT
), 4MHz,
Synchronous Step Down DC/DC Converter
95% Effi ciency, V
IN
: 2.25V to 5.5V, V
OUT(MIN)
= 0.8V, I
Q
= 64μA,
I
SD
< 1μA, TSSOP-28E Package
LTC3440 600mA (I
OUT
), 2MHz,
Synchronous Buck-Boost DC/DC Converter
95% Effi ciency, V
IN
: 2.5V to 5.5V, V
OUT(MIN)
= 2.5V, I
Q
= 25μA,
I
SD
< 1μA, MSOP-10 Package
LOAD CURRENT (mA)
1
EFFICIENCY (%)
90
80
70
60
50
40
30
10 100 1000
3548 TA05
V
OUT
= 3.3V
Burst Mode OPERATION
NO LOAD ON OTHER CHANNEL
4.2V
2.8V
3.6V
LOAD CURRENT (mA)
1
EFFICIENCY (%)
100
95
90
85
80
75
70
65
60
10 100 1000
3548 TA06
V
OUT
= 1.8V
Burst Mode OPERATION
NO LOAD ON OTHER CHANNEL
4.2V
2.8V
3.6V
Effi ciency vs Load Current
Effi ciency vs Load Current
RUN2 V
IN
V
IN
= 2.8V
TO 4.2V
V
OUT2
= 3.3V
AT 100mA
V
OUT1
= 1.8V
AT 800mA
RUN1
POR
SW1
V
FB1
GND
V
FB2
SW2
MODE/SYNC
LTC3548
C1
10μF
R5
100k
POWER-ON
RESET
C4, 33pF
C5, 22pF
L1
2.2μH
L2
15μH
R4
887k
R2
604k
R1
301k
R3
196k
C3
4.7μF
C6
22μF
C2
10μF
3548 TA04
+
M1
D1
C1, C2: TAIYO YUDEN JMK316BJ106ML
C3: MURATA GRM21BR60J475KA11B
C6: KEMET C1206C226K9PAC
D1: PHILIPS PMEG2010
L1: MURATA LQH32CN2R2M33
L2: TOKO A914BYW-150M (D52LC SERIES)
M1: SILICONIX Si2302DS
2mm Height Lithium-Ion Single Inductor Buck-Boost Regulator and a Buck Regulator
