RT4532

®

DS4532-00 May 2015

www.richtek.com

1

©

Copyright 2015 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

Simplified Application Circuit

High Efficiency Backlight LED Driver

General Description

The RT4532 is a high-efficiency LED driver 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.

and high speed mode. The RT4532 supports linear

mappings with 256 steps to setup the brightness of

backlight LEDs. It also supports PWM dimming to adjust

the brightness.

The RT4532 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 24V for different

applications. The RT4532 is available in the

WL-CSP-10B 0.87x2.07 package.

Features

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Input Voltage Range : 2.5V to 5.5V

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Internal Schottky Diode

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Drive Up to 6 WLEDs in 4 String

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External PWM Brightness Control

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550k/1.1MHz Switching Frequency

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Built-in Internal Soft-Start

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Regulation

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Up to 85% Efficiency with Small Magnetics

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Programmable 16V/24V OVP

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Current Accuracy

±±±±±5% and Current Balance ±±±±±3%

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UVLO, OVP, OCP, OTP Protection

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Shutdown Current : < 1

μμμμμA

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Temperature Range :

−−−−−40°°°°°C to 85°°°°°C

Applications

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Cellular Phones

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Digital Cameras

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PDAs and Smart Phones

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Portable Instruments

Ordering Information

Note :

Richtek products are :

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RoHS compliant and compatible with the current require-

ments of IPC/JEDEC J-STD-020.

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Suitable for use in SnPb or Pb-free soldering processes.

RT4532

Package Type

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

EN

VOUT

VIN

L

RT4532

LX

FB1

FB2

PWM

SCL

SDA

Enable

GND

x 6