AS3647B - austriamicrosystems

AS3647B 1600mA High Current LED Flash Driver

The AS3647/47B is an inductive high efficient DCDC step up converter with two current sinks. The DCDC step up converter operates at a fixed frequency of 4MHz and includes soft startup to allow easy integration into noise sensitive RF systems. The two current sinks can operate in flash / torch / assist (=video) light modes. The AS3647/47B includes flash timeo.

Features

High efficiency 4MHz fixed frequency DCDC Boost converter with soft start allows small coils - Stable even in coil current limit
LED current adjustable up to 1600mA
Automatic current adjustment for low battery voltage
PWM operation for lower output current for reliable light output of the LED; running at 31.25kHz to avoid audible noise
Protection functions: Automatic Flash Timeout timer to protect the LED(s) Overvoltage and undervoltage Protection Overtemperature Protection LED short/open circuit protection
I2C Interface with automatic shutdown
5V constant voltage mode operation .