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AS3643 LED Flash Driver

1.3A single LED flash driver


  • 4MHz fixed frequency DC-DC
  • Small chip-scale package
  • Overvoltage, overtemperature, undervoltage, flash timeout and LED short circuit protection functions


  • Tiny external coils
  • Small system size
  • High system safety

Product parameters

Topology Inductive
DC-DC Frequency [MHz] 4
Performance (ILed Max.) [mA] 1300
- [Vout Max.] 5.5
LED Channels [Curr. Sinks] 2
- [Curr. Source] Low side
- [Flash LEDs] 1
- [Indicator LED] Flash LED
Interfaces [I²C] Yes
- [Enable]
Safety Features [TimeOut] Yes
- [TXMask] Yes
Package WL-CSP-13 (2.25x1.5)-0.5p

General Description

The AS3643 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 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 AS3643 includes flash timeout, overvoltage, overtemperature, undervoltage and LED short circuit protection functions.

This product suits for the following applications:

  • Small size single LED flash solution for mobile phones


Name Type Description Language Software Eval SW 1-1-12-0 English

Technical Documents

Name Type Description Version Language
AS3643_BD000262_1-00.png Block Diagram AS3643 Block Diagram 1-00 English
AS3643_DS000184_1-00.pdf Datasheet Document version 1.5-4 1-00 English
AS11xx_AS13xx_AS17xx_AS349x_AS36xx_EN000160_1-00.pdf EoL Notification AS11xx_AS13xx_AS17xx_AS349x_AS36xx (issued 2018-Oct) 1-00 English
AS3643_UG000139_1-00.pdf User Guide Demo board 1-00 English

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