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BCT3222

Description
LED backlight driver
CategoryLED optoelectronic/LED   
File Size195KB,7 Pages
ManufacturerBroadchip Technology Group Co.,Ltd
Websitehttp://www.broadchip.com/
BROADCHIP TECHNOLOGY GROUP Co., Ltd. (BROADCHIP TECHNOLOGY GROUP Co., Ltd.) is an integrated circuit design company established by a Chinese entrepreneurial team in Silicon Valley, USA. In 2007, it established a wholly-owned subsidiary in Shanghai: BroadChip Electronic Technology (Shanghai) Co., Ltd. The company's goal is to create a world-renowned enterprise with core competitiveness by introducing advanced integrated circuit design technology and innovative concepts from Silicon Valley, USA, combined with the use of a large number of outstanding scientific and engineering talents in China. BroadChip Electronics' main business will focus on the design, development and sales of high-performance, high-quality, low-power, and cost-effective analog and mixed integrated circuit chips. Its products will be widely used in computers, communications, automotive electronics, and popular civilian electronic products. The company focuses on the design, development and sales of high-performance, high-quality analog and mixed-signal integrated circuit chips and acceleration sensor chips. It adopts the internationally common model of fabless production design companies, outsourcing wafer processing and packaging testing, and focusing on product design, development and sales.
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BCT3222 Overview

LED backlight driver

Features

Product Name: LED Backlight Driver


Product model: BCT3222


Product Description:


BCT3222 is a high-performance white LED driver chip. BCT3222 uses an internal resistor to set the bias current for the 6-way LED channel, and the channel current matching is +/-1.5%. The bias current changes very little with voltage fluctuations, and the dropout voltage is very low. BCT3222 only needs a dropout voltage of 50mV to make the channel output 20MA current and meet the LED light brightness requirements.


By using a SEL pin, the BCT3222 can drive six parallel common anode or common cathode white LEDs, adjust the current value, and maintain consistent brightness.


The brightness of the LED lamp is adjusted by driving the EN pin with a pulse signal. The current can be set from 2.5mA to 20mA, and there are 8 brightness levels for users to set. The internal soft-start circuit can effectively reduce the inrush current during startup and mode conversion.


characteristic:


—Drive common anode or common cathode LED


— Dropout voltage as low as 50mV at 20mA channel current


—Saturation current 20MA


—Less than 2% LED current matching


- One-line adjustment of 8 brightness levels


—Operating voltage range 2.7V to 5.5V


—Thermal shutdown protection


—Low input noise and EMI


—PackageDFN-10L

BCT3222 Preview

Download Datasheet
September , 2009, REV1.0
BCT3222
preliminary
6 Channel LED Driver (Common-Anode & Common-Cathode)
Low Dropout Current Source & Current Sink
General Description
The BCT3222 is a high performance white
LED driver. The BCT3222 uses an internal
resistor to set the bias current for four LEDs,
which are matched to +/-1.5%. The BCT3222's
advantages over ballast resistors include much
lower bias variation with supply voltage
variation, significantly lower dropout voltage,
and in some applications, significantly
improved efficiency. The BCT3222 requires
only a 50mV dropout voltage at a 20mA load on
each output to match the LED brightness.
By using one SEL pin, the BCT3222 can
support to drive 6 parallel Co-Anode or
Co-Cathode white LEDs and regulates a
constant current for uniform intensity.
Users can easily configure the LED current
from 2.5mA to 20mA by a serial pulse. The
dimming of white LEDs current can be
achieved by applying a pulse signal to the EN
pin. There are totally 8 steps of current could be
set by users. Internal soft start circuitry
effectively reduces the in-rush current while
both start-up and mode transition.
Features
Drive Common Anode or Common
Cathode LEDs
Low 50mV Dropout at 20mA
20mA full scale current
<2% LED Current Matching (TYP)
One Wire interface for 8-Step
Brightness
Control
2.7V to 5.5V Supply Voltage Range
Thermal Shutdown Protection
Low Input Noise and EMI
RoHS Compliant and 100% Lead
(Pb)-Free, DFN-10L Package
Applications
Cell Phones
PDAs
Digital Cameras, Camcorders
Portable Instrumentation
Battery Powered Equipment
Pin Configurations
(Top View)
DFN3x3-10L Package
www.broadchip.com
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