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LTC3427EDCTR

500mA, 1.25MHz Synchronous Step-Up DC/DC Converter in 2mm × 2mm DFN Package

Linear Technology 

FEATURES

■ High Efficiency: Up to 94%

■ 3.3V at 200mA from Two Alkaline Cells

■ 5V at 200mA from a Single Li-Ion Cell

■ Inrush Current Limiting and Soft-Start

■ Output Disconnect in Shutdown

■ 1.8V to 5V VIN Range

■ 1.8V to 5.25V VOUT Range

■ 1.25MHz Fixed Frequency, Low Noise PWM

■ Internal Synchronous Rectifier

■ Logic Controlled Shutdown (<1µA)

■ Anti-Ringing Control Minimizes EMI

■ Tiny External Components

■ Short-Circuit Protection

■ Low Profile (0.75mm × 2mm × 2mm) DFN Package

U

APPLICATIO S

■ Handheld Instruments

■ Digital Cameras

■ Wireless Handsets

■ GPS Receivers

■ Portable Medical Devices

■ MP3 Players

LTC3427

500mA, 1.25MHz

Synchronous Step-Up

DC/DC Converter in

2mm × 2mm DFN Package

DESCRIPTIO

The LTC®3427 is the industry’s first high efficiency, fixed

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 0.525Ω N-channel MOSFET switch

and a 0.575Ω 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

provides a soft-start of VOUT. A switching frequency of

1.25MHz minimizes solution footprint by allowing the use

of tiny, low profile inductors and ceramic capacitors and

produces very low VOUT ripple. The current mode PWM

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 1µA and thermal shutdown.

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

All other trademarks are the property of their respective owners.

TYPICAL APPLICATIO

2-Cell Alkaline to 3.3V Synchronous Boost Converter

VIN

1.8V TO 3.2V 2-CELL +

ALKALINE

2.2µF

OFF ON

4.7µH

VIN

SW

LTC3427

SHDN VOUT

GND

FB

1000k

604k

VOUT

3.3V

200mA

4.7µF

3427 TA01a

100

95

90

85

80

75

70

10

2.4V to 3.3V Efficiency

1000

EFFICIENCY

100

POWER LOSS

100

LOAD CURRENT (mA)

10

1000

3427 TA01b

3427fa

1

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