AST1S31HF

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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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Related Applications

In-Vehicle Infotainment (IVI)

Telematics and Networking

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    • Part number
      Status
      Description
      Type
      Supplier

      STEVAL-ISA160V1

      Active

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

      PSU and Converter Solution Eval Boards ST
      STEVAL-ISA160V1

      Description:

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

CAD/EDA Symbols, Footprints and Models

Quality and Reliability

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.

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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

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

Sample & Buy

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ECCN (US)
ECCN (EU)
Packing Type
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Temperature (°C) Country of Origin
Budgetary Price (US$)*/Qty
min
max
AST1S31HF Available at 1 distributors

Distributor availability ofAST1S31HF

Distributor Name
Region Stock Min. Order Third party link
ARROW EUROPE 3000 0 Order Now

Distributor reported inventory date: 2020-10-23

Distributor Name

ARROW

Stock

3000

Min.Order

0

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-23

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Active
EAR99 NEC Tape And Reel VFDFPN 8 3x3x1.0 - - MALAYSIA 1.258 / 1k

AST1S31HF

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

1.258 / 1k

Distributor availability ofAST1S31HF

Distributor Name
Region Stock Min. Order Third party link
ARROW EUROPE 3000 0 Order Now

Distributor reported inventory date: 2020-10-23

Distributor Name

ARROW

Stock

3000

Min.Order

0

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-23

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

VFDFPN 8 3x3x1.0

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

1.258 / 1k

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