Overview
Sample & Buy
Solutions
Documentation
CAD Resources
Tools & Software
Quality & Reliability
eDesignSuite
Get Started
Partner products
Sales Briefcase
  • The ST1S31 device is an internally compensated 1.5 MHz fixed-frequency PWM synchronous step-down regulator. The ST1S31 operates from 2.8 V to 5.5 V input, while it regulates an output voltage as low as 0.8 V and up to VIN.

    The ST1S31 integrates a 60 mΩ high-side switch and a 45 mΩ synchronous rectifier allowing very high efficiency with very low output voltages.
    The peak current mode control with internal compensation delivers a very compact solution with a minimum component count.
    The ST1S31 device is available in 3 mm x 3 mm, 8 lead VFDFPN and SO8 packages.

    Key Features

    • 3 A DC output current
    • 2.8 V to 5.5 V input voltage
    • Output voltage adjustable from 0.8 V
    • 1.5 MHz switching frequency
    • Internal soft-start and enable
    • Integrated 60 mΩ and 45 mΩ power MOSFETs
    • All ceramic capacitor
    • Power Good (POR)
    • Cycle-by-cycle current limiting
    • Current foldback short-circuit protection
    • VFDFPN 3 x 3 - 8L, SO8 packages

Recommended for you

Related Applications

Power Supplies and Converters

All tools & software

    • Part number
      Status
      Description
      Type
      Supplier

      STEVAL-ISA069V1

      Active

      3 A / 1.5 MHz step-down synchronous switching regulator based on the ST1S31 in DFN 3x3 package

      PSU and Converter Solution Eval Boards --

      STEVAL-ISA070V1

      Active

      3 A / 1.5 MHz step-down synchronous switching regulator based on the ST1S31 in SO-8 package

      PSU and Converter Solution Eval Boards --
      STEVAL-ISA069V1

      Description:

      3 A / 1.5 MHz step-down synchronous switching regulator based on the ST1S31 in DFN 3x3 package
      STEVAL-ISA070V1

      Description:

      3 A / 1.5 MHz step-down synchronous switching regulator based on the ST1S31 in SO-8 package

CAD/EDA Symbols, Footprints and Models

Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
ST1S31PUR
Active
VFDFPN 8 3x3x1.0 Industrial Ecopack2

ST1S31PUR

Package:

VFDFPN 8 3x3x1.0

Material Declaration**:

PDF XML

Marketing Status

Active

Package

VFDFPN 8 3x3x1.0

Grade

Industrial

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.

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

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

Sample & Buy

Part Number
Order from Distributors
Order from ST
Marketing Status
ECCN (US)
ECCN (EU)
Packing Type
Package
Temperature (°C) Country of Origin
Budgetary Price (US$)*/Qty
min
max
ST1S31PUR Available at 4 distributors

Distributor availability ofST1S31PUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 120 1 Order Now
RS COMPONENTS EUROPE 790 1 Order Now
MOUSER WORLDWIDE 2334 1 Order Now
Farnell Element14 EUROPE 706 1 Order Now

Distributor reported inventory date: 2020-10-20

Distributor Name

DIGIKEY

Stock

120

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

790

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

2334

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

706

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-20

Free Sample Buy Direct
Active
EAR99 NEC Tape And Reel VFDFPN 8 3x3x1.0 - - MALAYSIA 0.535 / 1k

ST1S31PUR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.535 / 1k

Distributor availability ofST1S31PUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 120 1 Order Now
RS COMPONENTS EUROPE 790 1 Order Now
MOUSER WORLDWIDE 2334 1 Order Now
Farnell Element14 EUROPE 706 1 Order Now

Distributor reported inventory date: 2020-10-20

Distributor Name

DIGIKEY

Stock

120

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

790

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

2334

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

706

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-20

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

VFDFPN 8 3x3x1.0

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

0.535 / 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