LTC3444_15 Datasheet, PDF (20/20 Pages) Linear Technology – Micropower Synchronous Buck-Boost DC/DC Converter for WCDMA Applications

LTC3444
TYPICAL APPLICATIO
Externally Compensated WCDMA Application. Singe Cell,
3.1V to 4.2V Input, 0.8V to 4.2V at 400mA Output.
3.3μH
L1
3.1V TO 4.2V
C_IN
+ ^4.7μF
Li-Ion
LTC3444
SW1
SW2
V_IN
SHDN
V_OUT
FB
GND
V_C
R4
47.5k
C1
10pF
R5
C2
47.5k _220pF
C3
10pF
R1
340k
V_OUT
0.8V TO 4.2V
C_OUT
4.7μF
R3
R2
205k
267k
V_CONTROL
DAC
3444 TA03
C_IN = MURATA:GRM31CR61C475K
C_OUT = MURATA:GRM31CR61C475K
L1 = COOPER BUSSMAN SD12-3R3
RELATED PARTS
PART NUMBER
LTC3403
LTC3408
LTC3440
LTC3441
LTC3442
LTC3443
DESCRIPTION
1.5MHz, 600mA, Synchronous Step-Down Regulator
with Bypass Transistor
1.5MHz, 600mA, Synchronous Step-Down Regulator
with Bypass Transistor
Up to 2MHz, 600μA, Synchronous Buck-Boost
DC/DC Converter
1MHz, 1.2A, Synchronous Buck-Boost
DC/DC Converter
Up to 2MHz, 1.2A, Synchronous Buck-Boost
DC/DC Converter
600MHz, 1.2A Synchronous Buck-Boost
DC/DC Converter
20 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
COMMENTS
96% Efficiency, V_IN: 2.5V to 5V, V_OUT: 0.3V to 3.5V,
I_SD <1μA, (3mm × 3mm) DFN Package
96% Efficiency, V_IN: 2.5V to 5V, V_OUT: 0.3V to 3.5V,
I_SD <1μA, (3mm × 3mm) DFN Package
95% Efficiency, V_IN: 2.5V to 5.5V, V_OUT(MIN) = 2.5V,
I_SD <1μA, I_Q = 25μA, 10-Lead MS Package
95% Efficiency, V_IN: 2.5V to 5.5V V_OUT(MIN) = 2.5V,
I_SD <1μA, I_Q = 25μA, 12-Lead (4mm × 3mm) DFN Package
95% Efficiency, V_IN: 2.5V to 5.5V, V_OUT(MIN) = 2.5V,
I_SD <1μA, I_Q = 25μA, 12-Lead (4mm × 3mm) DFN Package
95% Efficiency, V_IN: 2.5V to 5.5V, V_OUT(MIN) = 2.5V,
I_SD <1μA, I_Q = 25μA, 12-Lead (4mm × 3mm) DFN Package
3444fb
LT 0507 REV B • PRINTED IN THE USA
© LINEAR TECHNOLOGY CORPORATION 2005