描述 Description

The ET9381Y is a current-regulated charge pump ideal for powering high brightness LEDs for camera flash applications. The charge pump can be set to regulate two current levels for FLASH and TORCH modes.The ET9381Y automatically switches modes between step-up and step-down ensuring that LED current does not depend on the forward voltage. It switches at 2MHz, allowing the use of tiny components. The supply voltage ranges from 2.7V to 5.5V and is ideally suited for all applications powered by a single LI-Ion battery cell or three to four NiCd, NiMH, or Alkaline battery cells.The ET9381Y also features a very low shutdown current, an automatic soft-start mode to limit inrush current, as well as over current, over voltage and over thermal shutdown control. A low current sense reference voltage (50mV) allows the use of small 0603 current sensing resistors.The ET9381Y is available in Green DFN10(3×3) package and is specified over an ambient temperature range of -40℃ to +85℃.

特性 Features

? Output Current up to 850mA

? Up to 90% Efficiency in Torch Mode

? Adjustable FLASH Mode Current

? Automatic Buck/Boost Mode Switchover

? Input Voltage Range: 2.7V to 5.5V

? No need Inductors, high Frequency Operation: 2MHz

? Low 50mV Reference for Low Loss Sensing

? IQ PWM Dimming Control

? Automatic Soft Start Limits Inrush Current

? Low Input and Output Ripple and Low EMI

? Output Over Voltage Protection

? Over-current and Over-temperature Protection

? Part No. and Package

應(yīng)用 Application

? White LED Torch, Flash for Cell