Datasheet4U Logo Datasheet4U.com

AS3644 - Ultra Small Low Cost 320mA Inductive

General Description

The AS3644 is an inductive high efficient DCDC step up converter driving a current source.

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.

Key Features

  • Total flash driver solution only 11mm2.
  • High efficiency 4MHz fixed frequency DCDC Boost converter with soft start allows small coils.
  • LED currents 260mA to 320mA flash current (20mA steps) 51.6mA or 72.3mA Assist light (=torch) current.
  • Flash LED(s) cathode connected to ground: Improved thermal performance (ground = heat sink) Simplified PCB layout.
  • Adjustable Flash Timer 30ms to 480ms in 30ms steps.
  • Flash, Torch, Assist and Indicator Mode.
  • Protection function.

📥 Download Datasheet

Datasheet Details

Part number AS3644
Manufacturer austriamicrosystems
File Size 1.45 MB
Description Ultra Small Low Cost 320mA Inductive
Datasheet download datasheet AS3644 Datasheet

📁 Similar Datasheet

Part Number Description Manufacturer
AS3649 2500mA High Current LED Flash Driver ams
AS3630 8A Supercap Flash Driver ams
AS3661 Programmable 9-channel LED Driver austria microsystems
AS3665 9 Channel Advanced Command Driven RGB/White LED Driver austria microsystems
AS3668 4 Channel Breathlight Controller austria microsystems

Other Datasheets by austriamicrosystems

Part Number Description
AS3642 Ultra Small 500mA Inductive White LED Flash Driver
AS3643 1300mA High Current LED Flash Driver
AS3647 1600mA High Current LED Flash Driver
AS3647B 1600mA High Current LED Flash Driver
AS3648 2000mA High Current LED Flash Driver

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

View original datasheet text
valid Datasheet AS3644 Ultra Small Low Cost 320mA Inductive White LED Flash Driver 1 General Description The AS3644 is an inductive high efficient DCDC step up converter driving a current source. 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 current source operates in flash/torch/assist (video/autofocus) mode. The AS3644 includes flash timer, overvoltage, overtemperature, undervoltage and LED short circuit protection functions. The AS3644 is able to detect a broken coil. Together with the LED short and open detection the AS3644 can be used to verify the connection to its external components and allowing in-circuit test.