The KF9917 is a high efficiency step-up converter with an internally integrated 40V power MOSEFT. It runs with an optimal 0.8MHz frequency that enables use of small extemal components while still providing best efficiencies. It has an internal current limit as high as 1A, and it can drive up to 10 LEDs at 50mA output current. The incorporated 18-100KHz true PWM-Dimming feature by EN pin can be used to digitally program the LED current. For maximum protection，the KF9917 has an internal OVP protection at 38V to prevent the chip from damages when the LED string is not connected to the output.

KF9917 is available in a space saving SOT- 23-6 package.

        Features

Up to 91% Efficiency (6 LEDs)

Drive up to 10 LEDs with 50mA

Drive up to 40 LEDs in total

38V OVP protection

True PWM Brightness Control

200mV Feedback Voltage

1A current limit

SOT-23-6 Package

        Application

Cellphone and Smartphone

MID or Tablet PC

TFT-bias for L .CD screen

Power for OL .ED

LED torch

Satellite Set Top Box