LTC3441| Datasheet

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LTC3441 High Current Micropower Synchronous Buck-Boost DC/DC Converter

FEATURES

DESCRIPTIO

Regulated Output with Input Above, Below or Equal to the Output Single Inductor, No Schottky Diodes High Efficiency: Up to 95% 25A Quiescent Current in Burst Mode Operation Up to 1.2A Continuous Output Current from a Single Lithium-Ion True Output Disconnect in Shutdown 2.4V to 5.5V Input Range 2.4V to 5.25V Output Range 1MHz Fixed Frequency Operation Synchronizable Oscillator Selectable Burst Mode or Fixed Frequency Operation <1A Quiescent Current in Shutdown Small, Thermally Enhanced 12-Lead (4mm 3mm) DFN package

The LTC 3441 is a high efficiency, fixed frequency, buckboost DC/DC converter that operates efficiently from input voltages above, below or equal to the output voltage. The topology incorporated in the IC provides a continuous transfer function through all operating modes, making the product ideal for single lithium ion or multicell applications where the output voltage is within the battery voltage range. The device includes two 0.10 N-channel MOSFET switches and two 0.11 P-channel switches. External Schottky diodes are optional, and can be used for a moderate efficiency improvement. The operating frequency is internally set to 1MHz and can be synchronized up to 1.7MHz. Quiescent current is only 25A in Burst Mode operation, maximizing battery life in portable applications. Burst Mode operation is user controlled and can be enabled by driving the MODE/SYNC pin high. If the MODE/ SYNC pin is driven low or with a clock, then fixed frequency switching is enabled. Other features include a 1A shutdown, soft-start
control, thermal shutdown and current limit. The LTC3441 is available in a thermally enhanced 12-lead (4mm 3mm) DFN package.

APPLICATIO S

Handheld Computers Handheld Instruments MP3 Players Digital Cameras

LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst Mode is a registered trademark of Linear Technology Corporation.

TYPICAL APPLICATIO
L1 4.7H 4 9 2.5V TO 4.2V 5 8

Li-Ion to 3.3V at 1A Buck-Boost Converter
VOUT 3.3V 1A 340k EFFICIENCY (%)

100 95 90 85 80 75 70 65

VOUT = 3.3V

SW1 PVIN VIN

SW2

10

Li-Ion

* CIN 10F

VOUT 12 LTC3441 FB 1 11 VC SHDN/SS 7 2 MODE/SYNC GND 3 6 PGND PGND

15k 1.5nF 200k

COUT 22F

60 55 50 2.5 3 3.5 4 VIN (V) 4.5 5 5.5
3441 TA02

*1 = Burst Mode OPERATION 0 = FIXED FREQUENCY

CIN: TAIYO YUDEN JMK212BJ106MG COUT: TAIYO YUDEN JMK325BJ226MM L1: TOKO A916CY-4R7M

3441 TA01

U
Efficiency vs VIN
IOUT = 200mA IOUT = 1A
3441fa

U

U

1

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LTC3441 DATASHEET