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BCT3221 - 4-Channel LED Driver

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%.

Features

  • Drive Common Anode or Common Cathode LEDs.
  • Low 50mV Dropout at 20mA.
  • 20mA full scale current.

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Datasheet preview – BCT3221

Datasheet Details

Part number BCT3221
Manufacturer BROADCHIP
File Size 270.93 KB
Description 4-Channel LED Driver
Datasheet download datasheet BCT3221 Datasheet
Additional preview pages of the BCT3221 datasheet.

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Full PDF Text Transcription

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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 or Co-Cathode white LEDs and regulates a constant current for uniform intensity.
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