描述 Description

The ET9383Y is an inductive high efficient DC-DC step up converter with two current sinks. The DC-DC step up converter operates at a fixed frequency of 2MHz and includes soft startup to allow easy integration into noise sensitive RF systems. The two current sinks can operate in Flash / Movie torch light modes. Flash mode is usually used with 700ms timer control to generate a high intensity flash. The Flash mode and Movie/Torch mode LED current is programmed by external resistors, making the flash LED solution simple to control. The ET9383Y includes flash timeout, over-voltage, over-temperature, under-voltage and LED short and open circuit protection functions. Built-in circuitry prevents excessive inrush current during start-up. The shutdown feature reduces quiescent current to less than 1.0μA.The 2MHz switching frequency allow for the use of 1uH or 2.2uH inductors and 10uF ceramic capacitors. The leakage current in shutdown is less than 1μA.The real LED current at Flash mode and Movie/Torch mode can be programmed by external PWM signal at ENM pin.The ET9383Y is available in Green DFN14(3×2) package.

特性 Features

? High efficiency 2MHz fixed frequency DCDC Boost converter with soft start allows small coils

? Input Voltage Range: 3.0V to 4.8V

? Dual Flash LED Outputs , Drive Up to Total 1.5A or 0.75A per Channel

? High Efficiency LED Driver (Up to 97%)

? Independent Flash Mode Enable and Movie/Torch

? Flash Mode and Movie/Torch Mode Dimming via PWM Control

? One Resistor Sets Flash Mode LED Current

? One Resistor Sets Movie/Torch Mode LED Current

? Integrated Thermal Regulation Control

? Automatic Flash Timeout timer to protect the LED(s)

? Over-voltage and under-voltage Protection

? Over-temperature Protection

? LED short/open circuit protection

? Less than 1μA Shutdown Current

? Part No. and Package

應(yīng)用 Application

? Flash/torch/videolight for smartphones, feature-phones, tablets, DSCs, DVCs