3 A DC step-down switching regulator

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  • The AST1S31 device is an internally compensated 1.5 MHz fixed-frequency PWM synchronous step-down regulator. The AST1S31 device operates from 2.8 V to 4 V input, while it regulates an output voltage as low as 0.8 V and up to VIN.

    The AST1S31 integrates a 70 mΩ high-side switch and a 55 mΩ synchronous rectifier allowing very high efficiency with very low output voltages.
    The peak current mode control with an internal compensation deliver a very compact solution with a minimum component count.
    The AST1S31 device is available in a 3 x 3 mm, 8 leads VFDFPN package.

    Key Features

    • AECQ100 qualification
    • 3 A DC output current
    • 2.8 V to 4 V input voltage
    • Output voltage adjustable from 0.8 V
    • 1.5 MHz switching frequency
    • Internal soft-start and enable
    • Integrated 70 mΩ and 55 mΩ power MOSFETs
    • All ceramic capacitor
    • Power Good (POR)
    • Cycle-by-cycle current limiting
    • Current foldback short-circuit protection
    • VFDFPN 3 x 3 - 8L package

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Part Number
Package
Packing Type
Marketing Status
Budgetary Price (US$)*
Quantity
ECCN (US)
Country of Origin
Order from Distributors
Order from ST
AST1S31PUR VFDFPN 8 3x3x1.0 Tape And Reel
Active
1.258 10000 EAR99 MALAYSIA Check Availability

Distributor availability ofAST1S31PUR

Distributor Name
Region Stock Min. Order Third party link
ARROW EUROPE 15000 0 Order Now
MOUSER WORLDWIDE 100 1 Order Now

Distributor reported inventory date: 2019-11-15

Distributor Name

ARROW

Stock

15000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

100

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-11-15

Get sample

AST1S31PUR

Package

VFDFPN 8 3x3x1.0

Packing Type

Tape And Reel

Unit Price (US$)

1.258*

Distributor availability ofAST1S31PUR

Distributor Name
Region Stock Min. Order Third party link
ARROW EUROPE 15000 0 Order Now
MOUSER WORLDWIDE 100 1 Order Now

Distributor reported inventory date: 2019-11-15

Distributor Name

ARROW

Stock

15000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

100

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-11-15

Marketing Status

Active

Unit Price (US$)

1.258

Quantity

10000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors

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00 Files selected for download

Technical Documentation

    • Description Version Size Action
      DS10018
      Up to 4 V, 3 A step-down 1.5 MHz switching regulator for automotive applications
      6.0
      1.19 MB
      PDF
      DS10018

      Up to 4 V, 3 A step-down 1.5 MHz switching regulator for automotive applications

Publications and Collaterals

    • Description Version Size Action
      AST1S3x family Power optimization for postregulated automotive systems 1.0
      896.44 KB
      PDF

      AST1S3x family Power optimization for postregulated automotive systems

    • Description Version Size Action
      Electric vehicle (EV) ecosystem 1.1
      1.28 MB
      PDF
      Switching Converters (DC-DC) – Quick Reference Guide 1.0
      481.92 KB
      PDF

      Electric vehicle (EV) ecosystem

      Switching Converters (DC-DC) – Quick Reference Guide

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
AST1S31PUR
Active
VFDFPN 8 3x3x1.0 Automotive Ecopack2

AST1S31PUR

Package:

VFDFPN 8 3x3x1.0

Material Declaration**:

PDF XML

Marketing Status

Active

Package

VFDFPN 8 3x3x1.0

Grade

Automotive

RoHS Compliance Grade

Ecopack2

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.