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Global Mixed-mode Technology Inc.

G5121

Fixed Frequency White LED Step-Up Converter

Features

Inherently Matched LED Current

High Efficiency: 87%

Drives Up to Five LEDs from 2.5V Supply

24V Internal Power Switch

Fast 1MHz Switching Frequency

Uses Tiny 1mm Tall Inductors

Requires Only 1碌F Output Capacitors

19.5V Over Voltage Protection

SOT-23-6 Package

General Description

The G5121 is a step-up DC/DC converter specifically

designed to drive up to 5 series white LEDs with con-

stant current. Series connection of the LEDs provides

identical LED currents resulting in uniform brightness

and eliminates the need for ballast resistors. The

G5121 switches at 1MHz, allowing the use of tiny ex-

ternal components. A low 0.254V feedback voltage

minimizes power loss in the current setting resistor for

high efficiency. The OVP pin monitors the output volt-

age and turns off the converter whenever the LEDs

are open.

The G5121 is available in low profile SOT-23-6 pack-

age.

Applications

White LED Backlight Display for PDA

Pocket PC

Smart Phones

Handheld Devices

Cellular Phones

Ordering Information

ORDER

NUMBER

G5121TB1U

MARKING

5121x

TEMP.

RANGE

-40擄C ~ +85擄C

PACKAGE

(Pb free)

SOT-23-6

Note:

TB : SOT23-6

U: Tape & Reel

Pin Configuration

Typical Application Circuit

L1

V

IN

2.7V to 4.2V

D1

SW

1

6

VCC

VCC

4.7碌H

SW

OVP

C2

1碌F/25V

5 LEDs

GND

2

G5121

5

OVP

C1

4.7碌F/6.3V

PWM Dimming

Waveform

G5121

SHDN

GND

FB

R

S

FB

3

SOT-23-6

4

SHDN

C1:TAIYO YUDEN, JMK212BJ475KD

C2:TAIYO YUDEN, TMK316BJ105KD

Ver: 1.1

Nov 17, 2005

TEL: 886-3-5788833

http://www.gmt.com.tw

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