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Richtek Technology - High Efficiency Backlight LED Driver

Numéro de référence RT4532
Description High Efficiency Backlight LED Driver
Fabricant Richtek Technology 
Logo Richtek Technology 





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RT4532 fiche technique
®
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 RT4532
LX VOUT
VIN
CIN
Enable
VIN
EN
PWM
SCL
SDA
GND
FB1
FB2
COUT
VOUT
x6
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS4532-00 May 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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