Datasheet > G5921

G5921

更新时间： 2024-11-15 03:38:43

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描述
Ultra Low-Dropout, Constant-Current White LED Bias

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G5921 数据手册

Global Mixed-mode Technology Inc.

G5920/G5921

Ultra Low-Dropout, Constant-Current White LED Bias

Features

General Description

Ultra Low 150mV Dropout at 20mA

The G5920/G5921 is a high performance ultra low-

dropout constant current bias supply for white LEDs. It

can be used as an alternative to the simple ballast

resistors in conventional parallel white LEDs applica-

tions. Each white LED bias current is matching to

0.6%.

0.6% High Accuracy Current Matching

20mA Full Scale Current

32 Level Linear Current Brightness Control

PWM Brightness Control

2.5V to 5.5V Supply Voltage Range

SOT-23-6 Package (G5920)

MSOP-8 Package (G5921)

For dimming control, an enable input pin is controlled

by processor GPIO output pulses for 32 level linear

current. Using a low frequency PWM waveform to this

enable input pin also controls the average LED current

which is proportional to the PWM duty.

Applications

Mobile Phones

White LED backlighting

The G5920/G5921 is suitable for single cell Li-ion bat-

tery power device that using low forward voltage white

LEDs. The white LEDs can be powered directly from

battery without extra external components. This takes

an advantage of highest efficiency and creates no EMI

problem.

Ordering Information

ORDER

NUMBER

G5920TB1U

G5921P8U

ORDER NUMBER

MARKING

TEMP. RANGE

PACKAGE

(Pb free)

G5920TB1Uf

G5921P8Uf

5920x

5921x

-40°C to 85°C

SOT-23-6

MSOP-8

Note:TB : SOT23-6

P8: MSOP-8

U: Tape & Reel

Pin Configuration

Typical Application Circuit

G5920

Linear Current Dimming

LED1

LED2

GND

LED1

VCC

LED3

VCC

GND

LED3

V_BAT

0.1µF

SOT-23-6

G5921

G5920

PWM Dimming

LED2

GND

LED1

LED2

LED4

LED3

LED1

VCC

N.C.

LED3

VCC

GND

V_BAT

0.1µF

MSOP-8

TEL: 886-3-5788833

Ver: 0.4 Preliminary

http://www.gmt.com.tw

Feb 03, 2005

12 3 4 5 6 7...9

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