ETA3421S2F

0.7A, 1.5MHz Step-Down Constant Current, High Efficiency
LED Driver

FEATURES
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 PWMDimming
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.
ETA3421 is housed in a tiny SOT23-5 package.
 

 Up to 90% Efficiency
 1.5MHz Switching Frequency
 0.1V FB Voltage
 True PWM Current Program
 Open LED Protection
 Short LED Protection
 Tiny SOT23-5 Package