LTC3531/

LTC3531-3.3/LTC3531-3

1

3531fb

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO

INPUT VOLTAGE (V)

1.5

80

90

5.5

3531 TA01b

70

60

2.5

3.5

4.5

2

3

4

5

100

75

85

65

95

BOOST

MODE

4SW

MODE

BUCK

MODE

buck-boost DC/DC converters that operate from input

voltages above, below or equal to the output voltage. The

topology incorporated in the ICs provides a continuous

transfer through all operating modes, making the product

ideal for single cell Li-Ion and multicell alkaline or nickel

applications. The converters operate in Burst Mode, mini-

mizing solution footprint and component count as well as

providing high conversion efficiency over a wide range of

load currents.

The devices include two 0.5Ω N-channel MOSFET switches

and two P-channel switches (0.5Ω, 0.8Ω). Quiescent

current is typically 16μA, making the parts ideal for bat-

tery power applications. Other features include a <1μA

shutdown current, current limiting, thermal shutdown

and output disconnect. The parts are offered in a 6-pin

3mm DFN package for fixed and adjustable versions.

200mA Buck-Boost

Synchronous DC/DC

Converters

■

Regulated Output with Input Above, Below or Equal

to the Output

■

Single Inductor

■

Up to 90% Efficiency

■

■

■

■

■

■

■

Ultra Low Quiescent Current: 16μA, Shutdown

Current <1μA

■

Only 3 External Components Required

(Fixed Voltage Versions)

■

Short-Circuit Protection

■

Output Disconnect in Shutdown

■

Available in 6-Pin ThinSOT and 3mm × 3mm DFN

Packages

■

Handheld Instruments

■

MP3 Players

■

Handheld computers

■

PDA/GPS

SW1

SW2

SHDN

GND

LTC3531-3.3

2.2

μF

10

μF

ON OFF

Li-Ion

10

μH

3.1V TO

4.2V

3.3V

160mA

3531 TA01a

+

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

Burst Mode is a registered trademark of Linear Technology Corporation.

ThinSOT is a trademark of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

Protected by U.S. Patents including 6166527.