LTC3525D-3.3

1

3525d33f

LOAD (mA)

0.01

0.1

100

90

80

70

60

50

40

30

20

100

10

1

0.1

0.01

1

10

1000

100

LT3525 • TA02

EFFICIENCY

POWER LOSS

400mA Micropower

Synchronous Step-Up DC/DC

Converter with Pass Through Mode

up DC/DC converter that can start up with an input as low

as 0.85V. It offers a compact, high efficiency alternative to

charge pumps in single cell or dual cell alkaline or Li-ion

applications. Only three small external components are

required. The LTC3525D features a fixed output voltage

the inductor.

The device includes a 0.5Ω N-channel MOSFET switch

and a 0.8Ω P-channel synchronous rectifier. Peak switch

current ranges from 150mA to 400mA, depending on

load, providing enhanced efficiency. Quiescent current

is an ultralow 7µA, maximizing battery life in portable

applications.

Other features include anti-ringing control and thermal

shutdown. The LTC3525D is available in a tiny 6-pin SC70

package.

■

MP3 Players

■

Portable Instruments

■

Glucose Meters

■

Digital Cameras

■

■

Up to 95% Efficiency

■

0.85V Minimum Input Start-Up Voltage

■

Fixed Output Voltage of 3.3V

■

Delivers 60mA at 3.3V from a 1V Input,

or 140mA at 3.3V from a 1.8V Input

■

■

■

Only Three External Components

■

■

Antiringing Control

■

Short-Circuit and Overtemperature Protection

■

Very Low Profile of 1mm

■

Tiny 6-Pin SC70 Package

LTC3525D-3.3 Efficiency and

Power Loss vs Load Current

APPLICATIO S

FEATURES

DESCRIPTIO

TYPICAL APPLICATIO

L1*

10

µH

3525 TA01

LTC3525D-3.3

*MURATA LQH32CN100K53

3.3V

140mA

GND

SW

SHDN

GND

1.8V to 3.2V

10

µF

1

µF

ON

PASS THROUGH

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

Burst Mode is a registered trademark of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

Patents Pending.