Asset Publisher

AS3729B Power Management Unit

8A dual-phase power stage (2 x 4A)


  • 2 phases with separate control input
  • Separate power NMOS and PMOS for 4A per phase
  • Stand-alone zero-crossing operation
  • Integrated temperature monitoring
  • WL-CSP16: 1.615mm x 1.615mm, 0.4mm pitch


  • Support for single or dual operation
  • 2 x 4A output stages are running on 2.7MHz
  • Overtemperature protection
  • Cost effective, small package

Product parameters

DC-DC Step Up Converters
DC-DC Step Down Converters 2-phase power stage with 2x4A
Special LDOs [mA]
Universal LDOs [mA]
Current Sinks [mA]
Charge Pump [V/mA]
Audio DAC [dB SNR]
Audio ADC [dB SNR]
Audio Features
General Purpose ADC [bit]
Customizable Startup Sequences
Package WL-CSP16 (1.615 x 1.615)

General description

The AS3729B is a companion chip for the AS3715/21/22 PMICs containing control circuitry and power FETs for 2 phases. Up to 4 ICs can be used in parallel to achieve 32A drive capability.

Not Recommended for New Designs
ams-OSRAM AG is discontinuing production of this device.

This product suits for the following applications:

  • Mobile phones
  • Tablets
  • Notebooks


Title Category Headline Buy
AS3715EvalKit Application Board Evaluation Kit for AS3715

Technical documents

Type Description Language
Datasheet Document version 1-03 English


Type Description Language
EoL Notification WITHDRAWAL of EOL for AS3729B-BWLT and AS3729B-BWLM (issued 2020-Jan) English
EoL Notification AS252x, AS36xx, AS37xx_AS3956 (issued 2019-Sep) English
EoL Notification AS3729B-BWLx EoL Notification (issued Nov-22-2021) English

Other information

Type Description Language
Block Diagram AS3729B Block Diagram English
Asset Publisher