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AS3645A LED Flash Driver

800mA single-LED, 1A dual-LED flash driver


  • Single or dual LED flash
  • Small chip-scale package
  • Overvoltage, overtemperature, undervoltage and LED open/short circuit protection functions


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

Product parameters

Topology Inductive
DC-DC Frequency [MHz] 2
Performance (ILed Max.) [mA] 800/500 (2/1 LED)
- [Vout Max.] 10
LED Channels [Curr. Sinks] 1
- [Curr. Source] High-side
- [Flash LEDs] 1 or 2
- [Indicator LED] 1
Interfaces [I²C] Yes
- [Enable] Yes
Safety Features [TimeOut] Yes
- [TXMask] Yes
Package WL-CSP-12 (1.5x2)-0.5p

General Description

The AS3645A inductive LED flash driver drives up to 1000mA and can be used for single LED flash or double LED flash applications. The AS3645A auto detects whether to employ single or dual LED mode, and enables direct one-button flashlight mode. A number of safety features protect against circuit damage, including programmable current limiting, LED open/short detection, overvoltage and undervoltage, overtemperature, and automatic flash timeout timer for thermal LED protection during flash.

This product suits for the following applications:

  • Small size LED flash solution for mobile phones


Name Type Description Language Software English Software Eval SW 1v50 English

Technical Documents

Name Type Description Version Language
AS3645_AN000131_1-00.pdf Application Note EMC test results 1-00 English
AS3645_AN000132_1-00.pdf Application Note Thermal measurements 1-00 English
AS3645_BD000265_1-00.png Block Diagram AS3645 Block Diagram 1-00 English
AS3645_DS000203_2-00.pdf Datasheet Document version 2-00 2-00 English
AS11xx_AS13xx_AS17xx_AS349x_AS36xx_EN000160_1-00.pdf EoL Notification AS11xx_AS13xx_AS17xx_AS349x_AS36xx (issued 2018-Oct) 1-00 English
AS3645_UG000193_1-00.pdf User Guide Demo board 1-00 English

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