RT4532_15 Datasheet, PDF (1/12 Pages) Richtek Technology Corporation – High Efficiency Backlight LED Driver

®
RT4532
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.
An I²C interface can provide easy backlight control in fast
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.
Ordering Information
RT4532
Note :
Package Type
WSC : WL-CSP-10B 0.87x2.07 (BSC)
Richtek products are :
 RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
 Suitable for use in SnPb or Pb-free soldering processes.
Features
 Input Voltage Range : 2.5V to 5.5V
 Internal Schottky Diode
 Fast-speed mode I²C Compatible Interface
 Drive Up to 6 WLEDs in 4 String
 External PWM Brightness Control
 550k/1.1MHz Switching Frequency
 Built-in Internal Soft-Start
 I²C Programmable 256 Steps Linear Current
Regulation
 Up to 85% Efficiency with Small Magnetics
 Programmable 16V/24V OVP
 Current Accuracy ±5% and Current Balance ±3%
 UVLO, OVP, OCP, OTP Protection
 Shutdown Current : < 1μA
 Temperature Range : −40°C to 85°C
Applications
 Cellular Phones
 Digital Cameras
 PDAs and Smart Phones
 Portable Instruments
Simplified Application Circuit
L
V_IN
C_IN
Enable
RT4532
LX
VOUT
VIN
EN
PWM
SCL
SDA
FB1
GND
FB2
C_OUT
V_OUT
x6
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS4532-01 August 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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