ETA1637同步升压芯片单节锂电可升压12V输出
输入2.7~6V
输出耐压30V OVP
静态功耗5uA
过温保护
带使能EN控制
ETA1637 Synchronous LED Driver with 0.1% Dimming Accuracy
DESCRIPTION
The ETA1637is 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
withan 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.
FEATURES
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
