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LTC3427

3427fa

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Wireless Handsets

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MP3 Players

2-Cell Alkaline to 3.3V Synchronous Boost Converter

500mA, 1.25MHz

Synchronous Step-Up

DC/DC Converter in

2mm

× 2mm DFN Package

µA)

× 2mm × 2mm) DFN Package

2.4V to 3.3V Efficiency

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO

The LTC

frequency, step-up DC/DC converter with true output

disconnect in a 6-lead 2mm

× 2mm DFN package. Requir-

ing minimal external components, the LTC3427 operates

from an input voltage as low as 1.8V. The LTC3427

contains an internal 0.525

Ω N-channel MOSFET switch

and a 0.575

Ω P-channel MOSFET synchronous rectifier,

which enables it to supply 200mA at 3.3V from a 2-cell

alkaline battery input.

The LTC3427 limits inrush current during start-up and

1.25MHz minimizes solution footprint by allowing the use

of tiny, low profile inductors and ceramic capacitors and

design is internally compensated, reducing external parts

count. Anti-ringing control reduces EMI in discontinuous

mode operation. The LTC3427 also features low shut-

down current of under 1

µA and thermal shutdown.

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

All other trademarks are the property of their respective owners.

LOAD CURRENT (mA)

10

70

75

80

85

90

100

10

100

1000

100

1000

3427 TA01b

95

EFFICIENCY

POWER LOSS

2.2

µF

2-CELL

ALKALINE

1.8V TO 3.2V

SHDN

GND

1000k

604k

4.7

µF

3427 TA01a

3.3V

200mA

SW

OFF ON

LTC3427

4.7

µH

FB

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