Datasheet > G5921ARC1U

G5921ARC1U

更新时间： 2024-11-15 15:45:31

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描述
Interface Circuit

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G5921ARC1U 数据手册

Global Mixed-mode Technology Inc.

G5921A

Four Channel, Ultra Low-Dropout, Constant-Current

White LED Bias

Features

General Description

Ultra Low 75mV Dropout at 20mA

The G5921A 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 applications. Each

white LED bias current is matching to 0.6%.

0.6% High Accuracy Current Matching

20mA Full Scale Current

16 Level Linear Current Brightness Control

PWM Brightness Control

2.5V to 5.5V Supply Voltage Range

TDFN2X2-8, TDFN3X3-8 and MSOP-8 Package

For dimming control, an enable input pin is controlled

by processor GPIO output pulses for 16 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 G5921A is suitable for single cell Li-ion battery

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

PACKAGE

MARKING

TEMP. RANGE

REMARK

NUMBER

G5921ARC1U

G5921ARD1U

G5921AP81U

(Pb free)

TDFN2X2-8

TDFN3X3-8

MSOP-8

521A

-40°C to 85°C

OBSOLETE

5921A

Note: RC: TDFN2X2-8

1: Bonding Code

U: Tape & Reel

RD: TDFN3X3-8

P8: MSOP-8

Pin Configuration

Typical Application Circuit

G5921A

Linear Current Dimming

LED1

LED2

G5921A

LED2

GND

LED3

LED1

LED4

LED3

Thermal

PPaadd

VCC

N.C.

LED4

VCC

GND

TDFN2X2-8/TDFN3X3-8

V_BAT

0.1µF

G5921A

PWM Dimming

G5921A

LED1

LED2

LED1

VCC

N.C.

GND

LED4

LED3

LED4

VCC

GND

MSOP-8

V_BAT

0.1µF

TEL: 886-3-5788833

http://www.gmt.com.tw

Ver: 0.3

Oct 02, 2008

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