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  • The ST1S41 is an internally compensated 850 kHz fixed-frequency PWM synchronous step-down regulator. The ST1S41 operates from 4.0 V to 18 V input, while it regulates an output voltage as low as 0.8 V and up to VIN.

    The ST1S41 integrates 95 mΩ high-side switch and 69 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 ST1S41 is available in VFQFPN 4 mm x 4 mm 8-lead package and HSOP-8.

    Key Features

    • 4 A output current
    • 4.0 V to 18 V input voltage
    • Output voltage adjustable from 0.8 V
    • 850 kHz switching frequency
    • Internal soft-start
    • Integrated 95 mΩ and 69 mΩ power MOSFETs
    • All ceramic capacitor
    • Enable
    • Cycle-by-cycle current limiting
    • Current foldback short-circuit protection
    • VFQFPN 4x4-8L and HSOP-8 packages

Recommended for you

Related Applications

Home, Building and City Automation

Industrial Power and Tools

Lighting and Controls

Power Supplies and Converters

Evaluation Tools

    • Part Number

      4 A, 850 kHz fixed-frequency PWM synchronous step-down demostration board based on the ST1S41 in a VFQFPN package

00 Files selected for download

Technical Documentation

    • Description Version Size Action
      DS9248
      4 A step-down switching regulator
      2.0
      1.22 MB
      PDF
      DS9248

      4 A step-down switching regulator

    • Description Version Size Action
      TN1224
      Mounting instructions for SMD (surface mounting device) packages
      2.2
      1.06 MB
      PDF
      TN1224

      Mounting instructions for SMD (surface mounting device) packages

Publications and Collaterals

    • Description Version Size Action
      Electric vehicle (EV) ecosystem 1.1
      1.28 MB
      PDF

      Electric vehicle (EV) ecosystem

Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
ST1S41PHR
Active
PowerSO-8 Industrial Ecopack2
ST1S41PUR
Active
DFN8 4x4 Industrial Ecopack2

ST1S41PHR

Package:

PowerSO-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

PowerSO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

ST1S41PUR

Package:

DFN8 4x4

Material Declaration**:

PDF XML

Marketing Status

Active

Package

DFN8 4x4

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 Power

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
Package
Packing Type
Marketing Status
ECCN (US)
Country of Origin
Budgetary Price (US$)*/Qty
ST1S41PUR Available at 3 distributors

Distributor availability ofST1S41PUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 3995 1 Order Now
MOUSER WORLDWIDE 4285 1 Order Now
Farnell Element14 EUROPE 3188 1 Order Now

Distributor reported inventory date: 2020-07-08

Distributor Name

DIGIKEY

Stock

3995

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

4285

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

3188

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-08

Buy now DFN8 4x4 Tape And Reel
Active
EAR99 MALAYSIA 0.788 / 1k
ST1S41PHR Available at 5 distributors

Distributor availability ofST1S41PHR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 3009 1 Order Now
COMPEL EUROPE 327 1 Order Now
ARROW EUROPE 15000 0 Order Now
MOUSER WORLDWIDE 6317 1 Order Now
Farnell Element14 EUROPE 2404 1 Order Now

Distributor reported inventory date: 2020-07-08

Distributor Name

DIGIKEY

Stock

3009

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

327

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

15000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

6317

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2404

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-08

Buy now PowerSO-8 Tape And Reel
Active
EAR99 PHILIPPINES 0.788 / 1k

ST1S41PUR

Package

DFN8 4x4

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.788 / 1k

Distributor availability ofST1S41PUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 3995 1 Order Now
MOUSER WORLDWIDE 4285 1 Order Now
Farnell Element14 EUROPE 3188 1 Order Now

Distributor reported inventory date: 2020-07-08

Distributor Name

DIGIKEY

Stock

3995

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

4285

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

3188

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-08

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.788 / 1k

ECCN (US)

EAR99

Country of Origin

MALAYSIA

ST1S41PHR

Package

PowerSO-8

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.788 / 1k

Distributor availability ofST1S41PHR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 3009 1 Order Now
COMPEL EUROPE 327 1 Order Now
ARROW EUROPE 15000 0 Order Now
MOUSER WORLDWIDE 6317 1 Order Now
Farnell Element14 EUROPE 2404 1 Order Now

Distributor reported inventory date: 2020-07-08

Distributor Name

DIGIKEY

Stock

3009

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

327

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

15000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

6317

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2404

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-08

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.788 / 1k

ECCN (US)

EAR99

Country of Origin

PHILIPPINES

(*) 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