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Global Mixed-mode Technology Inc.

G5920/G5921

Ultra Low-Dropout, Constant-Current White LED Bias

Features

Ultra Low 150mV Dropout at 20mA

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)

General Description

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%.

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.

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.

Applications

Mobile Phones

White LED backlighting

Ordering Information

ORDER

NUMBER

G5920TB1U

G5921P8U

Note:TB : SOT23-6

P8: MSOP-8

U: Tape & Reel

ORDER NUMBER

(Pb free)

G5920TB1Uf

G5921P8Uf

MARKING

5920x

5921x

TEMP. RANGE

-40擄C to 85擄C

-40擄C to 85擄C

PACKAGE

SOT-23-6

MSOP-8

Pin Configuration

G5920

LED2 1

6 LED1

Typical Application Circuit

Linear Current Dimming

EN

G5920

LED1

LED2

GND 2

5 VCC

LED3

GND

VCC

0.1碌F

V

BAT

LED3 3

4 EN

SOT-23-6

G5921

LED2

LED1

VCC

N.C.

1

2

3

4

8

7

6

5

GND

LED4

LED3

EN

PWM Dimming

EN

G5920

LED1

LED2

LED3

GND

VCC

0.1碌F

V

BAT

MSOP-8

Ver: 0.4 Preliminary

Feb 03, 2005

TEL: 886-3-5788833

http://www.gmt.com.tw

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