BCT3221 Overview
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.
BCT3221 Key Features
- Drive mon Anode or mon 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 pliant and 100% Lead (Pb)-Free, QFN-16L Package