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Richtek Technology - High Efficiency Backlight LED Driver

Numéro de référence RT4501
Description High Efficiency Backlight LED Driver
Fabricant Richtek Technology 
Logo Richtek Technology 





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RT4501 fiche technique
®
RT4501/A
High Efficiency Backlight LED Driver
General Description
The RT4501/A 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 RT4501 supports linear
mappings with 256 steps to setup the brightness of
backlight LEDs. It also supports PWM dimming to adjust
the brightness.
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.
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.
Features
Input Voltage Range : 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
PWM Dimming/Pulse Dimming Resolution 256/128
Steps
I2C Programmable 256 Steps Linear Current
Regulation
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
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
L
VIN
CIN
Enable
RT4501/A
LX VOUT
VIN
EN
PWM
SCL
SDA
GND
FB1
FB2
COUT
VOUT
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS4501/A-00 September 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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