Datasheet > RT4501A

RT4501A

更新时间： 2024-03-18 21:39:47

品牌	Logo	应用领域
立锜 - RICHTEK		/
页数	文件大小	规格书
14页	272K
描述
High Efficiency Backlight LED Driver

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RT4501A 数据手册

RT4501/A

High Efficiency Backlight LED Driver

General Description

Features

^Input Voltage Range : 2.5V to 5.5V

The RT4501/Ais a high-efficiency LEDdriver for backlight

applications. An asynchronous boost converter with an

internal Schottky diode and a current source driver are

designed to support 6LED/channel with wide input voltage

range from 2.5V to 5.5V.

^Internal Schottky Diode

^Fast-speed mode I²C Compatible Interface

^Drive Up to 7 WLEDs in 2 String

^External PWM/Pulse Brightness Control

^550k/1.1MHz Switching Frequency

^Built-in Internal Soft-Start

An I²C interface can provide easy backlight control in fast

and high speed mode. The RT4501 supports linear

mappings with 256 steps to setup the brightness of

backlight LEDs. It also supports PWM dimming to adjust

the brightness.

^PWM Dimming/Pulse Dimming Resolution 256/128

Steps

^I²C Programmable 256 Steps Linear Current

Regulation

For brightness dimming, the RT4501A supports 128 steps

pulse dimming which determines the LED current, and

RT4501 support 256 steps PWM dimming which

determines the LED current.

^Up to 85% Efficiency with Small Magnetics

 Programmable 16V/25.5V OVP

 Current Accuracy 5% and Current Balance 3%

 UVLO, OVP, OCP, OTP Protection

 Shutdown Current : < 1μA

The RT4501/A provides complete protection functions such

as input under-voltage lockout, over-current, output over-

voltage and over-temperature protection. The OVP

threshold voltage can be set at 16V and 25.5V for different

applications. The RT4501/A is available in the

WL-CSP-10B 0.87x2.07 (BSC) package.

 Temperature Range : −40°C to 85°C

 RoHS Compliant and Halogen Free

Applications

 Cellular Phones

 Digital Cameras

 PDAs and Smart Phones

 Portable Instruments

Simplified Application Circuit

RT4501/A

VOUT

OUT

VIN

Enable

PWM

SCL

SDA

GND

FB1

FB2

is a registered trademark of Richtek Technology Corporation.

DS4501/A-00 September 2014

www.richtek.com

12 3 4 5 6 7...14

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