Datasheet > SC4538_08

SC4538_08

更新时间： 2024-11-23 06:10:15

品牌	Logo	应用领域
商升特 - SEMTECH		转换器升压转换器
页数	文件大小	规格书
14页	253K
描述
High Effi ciency Boost Converter for up to 10 LEDs

阅读下载

中文翻译

获取价格

数据手册

如果您发现信息不准确，欢迎纠错

SC4538_08 数据手册

SC4538

High Eﬃciency Boost Converter

for up to 10 LEDs

POWER MANAGEMENT

Features

Description

Input voltage range — 2.8V to 5.5V

Programmable LED current up to 30mA

Current-mode PWM control — 800kHz

Soft-start to reduce in-rush current

PWM dimming — 100Hz to 50kHz

PWM dimming at ISET — Analog and ﬁltered

Over-voltage protection — 38V (minimum)

Under-voltage lockout (UVLO)

The SC4538 is designed to regulate current for a series

string of white LEDs in LCD backlighting applications

where small size and high eﬃciency are priorities. This

device integrates an 800kHz current-mode PWM boost

converter and a 30mA programmable low dropout current

sink regulator.

An external resistor sets the LED current up to 30mA.

PWM dimming (100Hz to 50kHz) may be applied directly

to the enable (EN) pin, or dimming can be controlled by

applying an analog signal to the ISET circuit. The boost

circuit can output up to 38V (guaranteed) to drive up to 10

LEDs in series. The current regulator protects against

shorts between the BL and OUT pins and also eliminates

backlight glow during shutdown when using LEDs with

high leakage. Under-voltage lockout and thermal shut-

down provide additional protection. A small external

capacitor and series resistor control soft-start and loop

compensation. Over-voltage detection protects the

SC4538 if the BL pin is ﬂoating or shorted to ground.

Thermal shutdown

Shutdown current — <0.1μA (typical)

Ultra-thin package — 2mm x 2mm x 0.6mm

Lead-free package, WEEE and RoHS compliant

Applications

DSLR, DSC, and Video Cameras

Cellular handsets

Portable media players

Personal navigation systems

Satellite radio

The SC4538 is available in an MLPD-8 pin 2mm x 2mm x

0.6mm package, with a rated temperature range of -40°C

to +85°C.

Handheld video games

Typical Application Circuit

C_OUT

2.8 to

5.5V

OUT

C_IN

SC4538

Enable and

PWM dimming

R_ISET

ISET

C_COMP

R_COMP

COMP

GND

June 20, 2008

12 3 4 5 6 7...14

中文翻译

下载PDF

与SC4538_08相关器件

型号	品牌	获取价格	描述	数据表
SC4538EVB	SEMTECH	获取价格	High Effi ciency Boost Converter for up to 10 LEDs
SC4538ULTRT	SEMTECH	获取价格	High Effi ciency Boost Converter for up to 10 LEDs
SC4539	SEMTECH	获取价格	High Effi ciency Boost Converter for up to 6 LEDS
SC4539_08	SEMTECH	获取价格	High Effi ciency Boost Converter for up to 6 LEDS
SC4539EVB	SEMTECH	获取价格	High Effi ciency Boost Converter for up to 6 LEDS
SC4539ULTRT	SEMTECH	获取价格	High Effi ciency Boost Converter for up to 6 LEDS
SC453EVB	SEMTECH	获取价格	Portable, VID Programmed Single Phase Power Supply Controller
SC453MLTRT	SEMTECH	获取价格	Portable, VID Programmed Single Phase Power Supply Controller
SC453TSTRT	SEMTECH	获取价格	Portable, VID Programmed Single Phase Power Supply Controller
SC454	SEMTECH	获取价格	Single-Phase Single Chip IMVP-6/6+ Vcore Power Supply