The DiodesZetex AL5809Q is a constant current linear LED driver that can be connected on the high side or low side of the LEDs as a Constant current Regulator (CCR). The AL5809Q has output current of 25 mA. The AL5809Q contains a Low Dropout regulator which provides power to the internal current regulation control block. A fixed preset LED current setting resistor sets the reference current of the current regulation block. The LED current setting resistor varies with each variant of the AL5809. An accurate current mirror within the current regulation control block then increases the reference current to the preset LED current of the AL5809Q. Robust power dissipation up to 1.5W with powerDI123 (type B) package -40°C to +150°C of junction temperature range ±5% LED current tolerance