STLD20D datasheet(1/31 Pages) STMICROELECTRONICS

부품명	STLD20D

상세설명	White LED power supply

PDF	31 Pages

Scroll/Zoom	100%

제조업체	STMICROELECTRONICS [STMicroelectronics]

홈페이지	http://www.st.com

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1 / 31 page

October 2006

Rev 4

1/31

31

Order code

Part number

Package

Marking

Packing

STLD20D-C8

SOT23-8L

L2D

Tape and reel

STLD20D-DEF

QFN 3x3 8L

L2D

Tape and reel

STLD20D

White LED power supply

General features

■ Typical guaranteed efficiency: 80%

■ Drives up to 4 LEDs in series from a 2.8V up to

4.2V supply voltage

■ Constant current regulation over the whole

operating voltage range

■ PWM control mode

■ Integrated load disconnect switch that opens

the LEDs path in shutdown mode

■ Integrated soft start peak inductor current

■ Programmable peak inductor current

(STLD20D-C8 only)

■ Shutdown pin allows digital dimming control up

to 10kHz

■ Over voltage and over temperature protection

with automatic restart

■ Low shutdown current (< 1µA)

■ Small external inductor (10µH)

■ Tiny external ceramic capacitor (1µF)

Application

■ White Led supply for LCD backlight

■ Mobile phone

■ PDA and organizers, MP3 players, Toys

Description

The STLD20D is a constant switching frequency

boost regulator mainly dedicated to supply up to 4

white LEDs connected in series. A constant LED

current is achieved by sensing the LED current

through a sensing resistor RLED (see Figure 3.).

The device also includes a supply voltage

rejection circuit that prevents from any possible

flickering effect on the display that might happen

during input supply voltage variation. An

integrated Load Disconnect Switch open the LED

path to eliminate the current consumption in

shutdown mode. The maximum peak inductor

current can be programmed (STLD20D-C8 only).

SOT23-8L

QFN 3x3 8L

www.st.com

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