Up to 4 V, 3 A step-down 2.3 MHz switching regulator for automotive applications

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  • The AST1S31HF is an internally compensated 2.3 MHz fixed frequency PWM synchronous step-down regulator. The AST1S31HF 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 AST1S31HF device 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 internal compensation deliver a very compact solution with a minimum component count.
    The AST1S31HF is available in a 3 mm x 3 mm, 8-lead VFDFPN package.

    Key Features

    • AECQ100 qualified
    • 3 A DC output current
    • 2.8 V to 4 V input voltage
    • Output voltage adjustable from 0.8 V
    • 2.3 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
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AST1S31HF VFDFPN 8 3x3x1.0 Tape And Reel
Active
1.258 10000 EAR99 MALAYSIA No availability of distributors reported, please contact our sales office Buy now

AST1S31HF

Package

VFDFPN 8 3x3x1.0

Packing Type

Tape And Reel

Unit Price (US$)

1.258*

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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Evaluation Tools

    • Part Number

      3 A / 2.3 MHz step-down synchronous switching regulator based on the AST1S31HF in a DFN 3x3 package

00 Files selected for download

Technical Documentation

    • Description Version Size Action
      DS10625
      Up to 4 V, 3 A step-down 2.3 MHz switching regulator for automotive applications
      3.0
      987.84 KB
      PDF
      DS10625

      Up to 4 V, 3 A step-down 2.3 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**
AST1S31HF
Active
VFDFPN 8 3x3x1.0 Automotive Ecopack1

AST1S31HF

Package:

VFDFPN 8 3x3x1.0

Material Declaration**:

PDF XML

Marketing Status

Active

Package

VFDFPN 8 3x3x1.0

Grade

Automotive

RoHS Compliance Grade

Ecopack1

(**) 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.

eDesignSuite

Converter

Input

V This option is required. And must be less than or equal to Volt. Max [V]
V This option is required. And must be greater than or equal to Volt. Min [V]

Output Power

V This option is required and must be a number.
A This option is required and must be a number.

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