STLED25 datasheet(1/30 Pages) STMICROELECTRONICS

部件名	STLED25

功能描述	5 channels step-up white LED driver

PDF	30 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

1 / 30 page

This is information on a product in full production.

May 2012

Doc ID 022323 Rev 3

1/30

30

STLED25

5 channels step-up white LED driver

Datasheet

− production data

Features

■ Operating input voltage range from 2.3 V to

5.5 V

■ ± 7.5% LED current accuracy

■ Two LEDs in series per channel

■ High side current source

■ Up to 125 mA of total LED current

■ 86% efficiency at 100 mA

■ PWM dimming with automatic shutdown time

window

■ 2.5 MHz switching frequency

■ CSP 12 bumps 0.4 mm. pitch 1.4 x 1.8 mm.

Applications

■ LCD backlight with up to 10 LEDs

■ Cellular phones

■ PDAs

Description

The STLED25 is a fixed frequency, high efficiency,

boost DC-DC converter with five parallel high side

current sources. It is capable of providing 125 mA

of total current with a maximum voltage of 7.5 V

on each channel. Each current source supports

single or dual LED connection. The output voltage

of the step-up converter is automatically set at

100 mV above the highest voltage required on

any driver, to guarantee proper operation of the

linear current sources. The device implements a

self-test feature to detect failure of any of the

LEDs and to disable the related channel. The

failure status is reset as soon the IC is disabled.

This mode of failure detection allows the device to

continue operating driver channels that are

functioning normally, while avoiding excessive

power consumption or associated thermal issues.

The control technique is able to maintain the

efficiency close to 87% at medium load and

higher than 85% at light or full load. The device

also includes soft-start control, inrush current

limit, thermal shutdown and inductor peak current

limit. The STLED25 is packaged in a 12-bump

CSP (1.4 x 1.8 mm, 0.5 mm height).

Flip-Chip 12 bumps (1.4 x 1.8 mm.)

Table 1.

Device summary

Order code

Package

Packaging

STLED25JR

Flip-Chip12

Tape and reel

www.st.com

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