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LTC3400/LTC3400B

600mA, 1.2MHz Micropower

Synchronous Boost Converter

in ThinSOT

FEATURES

s

s

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DESCRIPTIO

Up to 92% Efficiency

Generates 3.3V at 100mA from a Single AA Cell

Low Start-Up Voltage: 0.85V

1.2MHz Fixed Frequency Switching

Internal Synchronous Rectifier

2.5V to 5V Output Range

Automatic Burst Mode

廬

Operation (LTC3400)

Continuous Switching at Light Loads (LTC3400B)

Logic Controlled Shutdown (< 1碌A(chǔ))

Antiringing Control Minimizes EMI

Tiny External Components

Low Profile (1mm) ThinSOT

TM

Package

The LTC

廬

3400/LTC3400B are synchronous, fixed fre-

quency, step-up DC/DC converters delivering high effi-

ciency in a 6-lead ThinSOT package. Capable of supplying

3.3V at 100mA from a single AA cell input, the devices

contain an internal NMOS switch and PMOS synchronous

rectifier.

A switching frequency of 1.2MHz minimizes solution

footprint by allowing the use of tiny, low profile inductors

and ceramic capacitors. The current mode PWM design is

internally compensated, reducing external parts count.

The LTC3400 features automatic shifting to power saving

Burst Mode operation at light loads, while the LTC3400B

features continuous switching at light loads. Antiringing

control circuitry reduces EMI concerns by damping the

inductor in discontinuous mode, and the devices feature

low shutdown current of under 1碌A(chǔ).

Both devices are available in the low profile (1mm) ThinSOT

package.

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

ThinSOT is a trademark of Linear Technology Corporation.

APPLICATIO S

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Pagers

MP3 Players

Digital Cameras

LCD Bias Supplies

Handheld Instruments

Wireless Handsets

GPS Receivers

TYPICAL APPLICATIO

L1

4.7碌H

100

+

SINGLE

AA CELL

C1

4.7碌F

1

6

SW

V

IN

V

OUT

5

R1

1.02M

1%

R2

604k

1%

V

OUT

3.3V

100mA

C2

4.7碌F

90

EFFICIENCY (%)

80

70

60

50

FIGURE 1 CIRCUIT

WITH OPTIONAL SCHOTTKY DIODE

(SEE APPLICATIONS INFORMATION)

1

10

100

LOAD CURRENT (mA)

1000

3400 F01a

LTC3400

OFF ON

4

SHDN

GND

2

C1, C2: TAIYO-YUDEN X5R EMK316BJ475ML

L1: COILCRAFT DO160C-472

FB

3

3400 F01

40

0.1

Figure 1. Single Cell to 3.3V Synchronous Boost Converter

U

Efficiency

V

IN

= 2.4V

V

IN

= 1.5V

3400f

U

U

1

next

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