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AS3642 LED Flash Driver

500mA single LED flash driver


  • 4MHz fixed frequency DC-DC
  • Small chip-scale package
  • Overvoltage, overtemperature, undervoltage 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] 500
- [Vout Max.] 5.5
LED Channels [Curr. Sinks] 1
- [Curr. Source] High-side
- [Flash LEDs] 1
- [Indicator LED] Flash LED
Interfaces [I²C] Yes
- [Enable]
Safety Features [TimeOut] Yes
- [TXMask]
Package WL-CSP6 (1.5x1.1)-0.5p

General Description

The AS3642 is an inductive high efficient DC-DC step-up converter driving a current source. 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 AS3642 includes flash timer, overvoltage, overtemperature, undervoltage and LED short circuit protection functions.

This product suits for the following applications:

  • Smallest size LED flash solution for mobile phones


Name Type Description Language Software Eval SW 1v02 English

Technical Documents

Name Type Description Version Language
AS3642_BD000353_1-00.png Block Diagram AS3642 Block Diagram 1-00 English
AS3642_DS000208_1-00.pdf Datasheet Document version 1.2-2 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

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