ETA3421

The ETA3421 is a high-efficiency, DC-to-DC step-down constant current LED driver, capable of delivering up to 0.7A of output current. The device operates from an input voltage range of 3.3V to 5.5V and use 0.1V FB voltage to achieve high efficiency. Running at a fixed frequency of 1.5MHz allows the use of small inductance value and low DCR inductors, thereby achieving higher efficiencies. Other external components, such as ceramic input and output caps, can also be small due to higher switching frequency. The incorporated 20-100KHz true PWM-Dimming feature by EN pin can be used to digitally program the LED current. Internal soft-start control circuitry reduces inrush current. Short and open LED protection improves design reliability.