ETA1637

www.etasolution.com

1

Powering Minds of the Smart

Synchronous LED Driver with 0.1% Dimming Accuracy

DESCRIPTION

FEATURES

The ETA1637 is a driver specially designed for back-lighting.

It consists of a high accuracy current sink that allows low

duty dimming and a high efficiency step-up converter with

an integrated low side and high side power MOSEFT. It runs

with an optimal 0.6MHz frequency that enables use of small

external components while still providing best efficiencies.

It has an internal current limit as high as 1A, and it can drive

up to 8 LEDs and 50mA in total output current. True PWM-

Dimming can be achieved through the EN pin. One of the

most important features of ETA1637 is that it provides an

accurate current at dimming duty cycle down to 0.1%. This

is very important for backlights that need to dim to very

low light while still providing good consistency.

For maximum protection, the ETA1637 has an internal OVP

protection at 30V to prevent the chip from damages when

the LED string is not connected to the output.

ETA1637 is available in a space-saving SOT23-6 package.



Synchronous Boost, No Schottky Diode Needed



Internal Current Source Driving, no need of external

current setting resistor



±10% LED Current Accuracy at 1% Diming Ratio



Capable of 0.1% dimming ratio



Up to 85% Efficiency (6 LEDs)



Drive up to 8 LEDs



30V Output Over Voltage Protection



LED string Short Circuit Protection



True PWM Brightness Control



1A current limit

APPLICATIONS



Cellphone and Smartphone



MID or Tablet PC



Camera



Car DVR Recorder

TYPICAL APPLICATION

ORDERING INFORMATION

PART No.

PACKAGE

TOP MARK

Pcs/Reel

ETA1637S2G

SOT23-6

EAYW

3000