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AS1331 Buck-Boost

300mA, DC-DC buck-boost converter


  • Automatic transition between buck and boost
  • 90% efficiency with 300mA @ 3.3V, 22uA quiescent current
  • Synchronous switching


  • Wide input voltage variation tolerance
  • Long battery life
  • Controlled noise spectrum

Product parameters

Input Voltage [V] 1.8 to 5.5
Output Voltage [V] 2.5 to 3.3
Output Current [mA] 300
Efficiency [%] 90
Iq [µA] 22
Architecture Hysteretic, sync.
fmax [kHz] <500
Enable/SHDN [/SHDN] Yes
Reset [POK] Yes
Features Low battery detection, \ fixed 2.5V, 3.0V or 3.3V output voltage, in adjustable variant adjustable in whole range
Package TDFN-10 (3x3)

General Description

The AS1331 is a synchronous buck-boost converter with 300mA output capability at 3.3V, ideal for single- and multi-cell operation. With 22µA quiescent current the device ensures over 90% efficiency. System protection includes undervoltage/power good signalling, and both current limiting and thermal shutdown.

This product suits for the following applications:

  • Handheld computers
  • Handheld instruments
  • Portable music players
  • PDAs
  • Two- and three-cell Alkaline, NiCd or NiMH battery
  • Single-cell Li battery


Title Category Headline Buy
AS1331EvalKit Application Board Evaluation Kit for AS1331

Technical Documents

Name Type Description Version Language
AS1331_BD000279_1-00.png Block Diagram AS1331 Block Diagram 1-00 English
AS1331_DS000372_1-00.pdf Datasheet Document version 1-06 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
AS1331_PD000389_1-00.png Other Product Document AS1331EvalKit Image 1-00 English
AS1331_UG000231_1-00.pdf User Guide Demo board 1-00 English
AS1331_UG000236_1-00.pdf User Guide Evaluation kit 1-00 English

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