Linear low-voltage-drop LED driver IC BCR431U is a linear LED driver IC regulating the LED current in standalone operation without any external power transistor. It is suitable for driving currents up to 37mA and the IC supply voltage ranges from 6V up to 42V. The LED current level can be adjusted by connecting a high-ohmic resistor Rset to pin RS. Despite temperature changes, the driving current is always under control, due to the smart temperature controlling circuit.