20
LTC3444
3444fb
© LINEAR TECHNOLOGY CORPORATION 2005
LT 0507 REV B • PRINTED IN THE USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
PART NUMBER DESCRIPTION COMMENTS
LTC3403 1.5MHz, 600mA, Synchronous Step-Down Regulator 96% Efficiency, V
IN
: 2.5V to 5V, V
OUT
: 0.3V to 3.5V,
with Bypass Transistor I
SD
<1μA, (3mm × 3mm) DFN Package
LTC3408 1.5MHz, 600mA, Synchronous Step-Down Regulator 96% Efficiency, V
IN
: 2.5V to 5V, V
OUT
: 0.3V to 3.5V,
with Bypass Transistor I
SD
<1μA, (3mm × 3mm) DFN Package
LTC3440 Up to 2MHz, 600μA, Synchronous Buck-Boost 95% Efficiency, V
IN
: 2.5V to 5.5V, V
OUT(MIN)
= 2.5V,
DC/DC Converter I
SD
<1μA, I
Q
= 25μA, 10-Lead MS Package
LTC3441 1MHz, 1.2A, Synchronous Buck-Boost 95% Efficiency, V
IN
: 2.5V to 5.5V V
OUT(MIN)
= 2.5V,
DC/DC Converter I
SD
<1μA, I
Q
= 25μA, 12-Lead (4mm × 3mm) DFN Package
LTC3442 Up to 2MHz, 1.2A, Synchronous Buck-Boost 95% Efficiency, V
IN
: 2.5V to 5.5V, V
OUT(MIN)
= 2.5V,
DC/DC Converter I
SD
<1μA, I
Q
= 25μA, 12-Lead (4mm × 3mm) DFN Package
LTC3443 600MHz, 1.2A Synchronous Buck-Boost 95% Efficiency, V
IN
: 2.5V to 5.5V, V
OUT(MIN)
= 2.5V,
DC/DC Converter I
SD
<1μA, I
Q
= 25μA, 12-Lead (4mm × 3mm) DFN Package
RELATED PARTS
Externally Compensated WCDMA Application. Singe Cell,
3.1V to 4.2V Input, 0.8V to 4.2V at 400mA Output.
LTC3444
V
CONTROL
3.1V TO 4.2V
SW2
R4
47.5k
C
OUT
4.7μF
3.3μH
L1
C
IN
4.7μF
V
OUT
0.8V TO 4.2V
R3
205k
R2
267k
R1
340k
R5
47.5k
C2
220
pF
C3
10
pF
C1
10
pF
V
OUT
FB
V
C
SW1
V
IN
SHDN
GND
DAC
+
Li-Ion
3444 TA03
C
IN
=
C
OUT
=
L1 =
MURATA:GRM31CR61C475K
MURATA:GRM31CR61C475K
COOPER BUSSMAN SD12-3R3
U
TYPICAL APPLICATIO
