BCT3221 Datasheet PDF

BROADCHIP BCT3221

The BCT3221 is a high performance white LED driver. The BCT3221 uses an internal resistor to set the bias current for four LEDs, which are matched to +/-1.5%. The BCT3221'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.

Part No.	BCT3221
Datasheet	BCT3221 Download
Manufacturer	BROADCHIP
Description	4-Channel LED Driver
Buy	Stock & Price

GENERAL DESCRIPTION

The BCT3221 requires only a 50mV dropout voltage at a 20mA load on each output to match the LED brightness. By using one SEL pin, the BCT3221 can support to drive 4 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. Pin Configurations (Top View)

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, QFN-16L Package Ap...