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SC446

更新时间：2025-06-29 07:52:41

品牌：SEMTECH

描述：High Efficiency Integrated Driver for 3-Strings of 100mA LEDs

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免费 PCB/SMT

概述
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SC446 概述

High Efficiency Integrated Driver for 3-Strings of 100mA LEDs 高效集成驱动器，用于100mA的LED的3串

SC446 数据手册

通过下载SC446数据手册来全面了解它。这个PDF文档包含了所有必要的细节，如产品概述、功能特性、引脚定义、引脚排列图等信息。

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SC446

High Eciency Integrated Driver for

3-Strings of 100mA LEDs

POWER MANAGEMENT

Features

Description

Wide input voltage range from 4.5V to 27V

36V maximum output voltage

The SC446 is a high-e"ciency multiple string WLED driver

with an integrated boost converter. It operates over a

wide input range from 4.5V to 27V with a maximum out-

put voltage of 36V and a 2.5A internal power switch. It

can drive up to thirty WLEDs in 3 strings with current up

to 100mA per string. The string-to-string current match-

ing is 2% typical, 3% maximum. The overall e"ciency is

greater than 90% due to the low current sense voltage

and a low-impedance internal power switch. The wide

PWM dimming range boasts a ratio of 500: 1.

Drives up to 30 WLEDs in 3 strings

Programmable LED current for up to 100mA per

string

+/- 2% string-to-string current matching

Up to 90% eciency

Wide 0.2% to 100% PWM dimming range

Possible analog dimming

Integrated 2.5A power switch

700kHz switching frequency for small size

Adjustable OVP for cost-e!ective output cap selection

Open/short LED protection

The 700kHz switching frequency enables the user to op-

timize the external component sizes for e"ciency. When

there are fewer than 10 LEDs in each string, users can ad-

just the output voltage protection yielding an allowable

reduction in associated costs, size and voltage ratings of

the output capacitor.

Thermal protection with auto-recovery

Thermally enhanced TSSOP-16 EDP package

Pb Free, Halogen Free, andWEEE/RoHS Compliant

The SC446 also features comprehensive open and short-

circuit LED protection functions. It disables the corre-

sponding strings with LED open or LED short conditions

while maintaining normal operation of other, una!ected

LED strings. This feature allows LCD panels to remain

viewable even under LED failure, wire disconnect, or

short-circuit conditions. The internal thermal shutdown

protects the IC from overheating at abnormal conditions.

Applications

Medium-sized LCD panel

Notebook Display

Automotive Car Navigation Display

Sub-Notebook and Tablet Computer Displays

Portable Media Players

The SC446 is available in a thermally-enhanced TSSOP-16

EDP package.

Typical Application Circuit

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www.semtech.com

January 28, 2010

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