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AS1111 LED Driver IC

Low-dropout LED drivers


  • Up to 4 channel 40mA driver
  • 150mV headroom to operate
  • Analog and PWM brightness control
  • No switching noise
  • Less external components needed


  • High brightness LEDs
  • Excellent efficiency & battery lifetime
  • High resolution dimming possible
  • Suitable for EMF sensitive envireonment
  • Small PCB area

Product parameters

Output [#] 2 - 4
LED Current per Output [mA] 40 - 80
Features Simple drive
Error Detection
LED-to-LED Matching [%] 3
Supply Voltage [V] 0.15 to 3.6
Package WL-CSP-6, 0.4mm pitch (AS1111A & AS1111B), MLPD-8, 0.5mm pitch (AS1111C)

General Description

The AS1111x family are high efficient LED drivers designed to match current source bias for any color LED, including white and blue. The devices can drive up to 4 high-current LEDs, the LED current can be adjusted using an external resistor (RSET) and dimmed with an external PWM signal via pin EN. It only requires 150mV headroom voltage to operate and when the devices are disabled, the supply current drops down to less than 1µA.

Not Recommended for New Designs
ams AG is discontinuing production of this device. Final lifetime buy order must be placed by June 30, 2021. Please contact your local sales representative for further information.

This product suits for the following applications:

  • Portable MP3 and DVD players
  • Mobile and cordless phones
  • PDAs
  • Consumer electronic


Title Category Headline Buy
AS1111AEvalKit Application Board Evaluation Kit for AS1111A
AS1111CEvalKit Application Board Evaluation Kit for AS1111C

Technical Documents

Type Description Language
Datasheet Document version 1-06 English

Environmental Documents

Type Description Language
Material Declaration Form MDF_193270006_AS1111B-BWLT English
Material Declaration Form MDF_193270002_AS1111A-BWLT English
Material Declaration Form MDF_174970079_AS1111-BSOU English
Material Declaration Form MDF_174970079_AS1111-BSOT English
Material Declaration Form MDF_172460039_AS1111C-BDFT English


Type Description Language
EoL Notification AS1111_AS1312_AS1313_AS1345_AS1376 selected variants (issued 2016-Dec) English
EoL Notification AS1xxx, AS25xx, AS3xxx, AS73211, AS89020, SL900A, TMD4704 (issued 2020-Dec) English

Other Information

Type Description Language
Block Diagram AS1111 Block Diagram English
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