February, 2009, REV2.
01 BCT3221 4 Channel LED Driver (Common-Anode & Common-Cathode) Low Dropout Current Source & Current Sink General Description 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.
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...

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