4A Monolithic synchronous step-down converter with high efficiency at light load

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  • The ST1S50 device is a 500 kHz fixed frequency PWM synchronous step-down regulator. The ST1S50 operates from 4.0 V to 18 V input, while it regulates an output voltage as low as 0.8 V and up to 0.88 x VIN.

    The ST1S50 device integrates a 95 mΩ high-side switch and a 69 mΩ synchronous rectifier allowing very high efficiency with very low output voltages.
    The peak current mode control with a special PFM mode enables high efficiency at a light load.
    The ST1S50 device is available in a VFDFPN10 3 x 3 x 1 mm - 10 leads package.

    Key Features

    • 4 A output current
    • 4.0 V to 18 V input voltage
    • Output voltage adjustable from 0.8 V to 0.88 x VIN
    • 500 kHz switching frequency
    • High efficiency at light load
    • Programmable soft-start and enable
    • Integrated 95 mΩ and 69 mΩ power MOSFETs
    • All ceramic capacitor
    • Power Good
    • Cycle-by-cycle current limiting
    • Short-circuit protection
    • VFDFPN10 3 x 3 x 1 mm - 10 L

Sample & Buy

Part Number
Package
Packing Type
Marketing Status
Budgetary Price (US$)*
Quantity
ECCN (US)
Country of Origin
Order from Distributors
Order from ST
ST1S50PUR DFN10 3X3 Tape And Reel
Active
0.788 1000 EAR99 - Check Availability

Distributor availability ofST1S50PUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 3547 1 Order Now
AVNET AMERICA 3000 0 Order Now
ARROW AMERICA 3000 3000 Order Now
MOUSER WORLDWIDE 1693 1 Order Now
Farnell Element14 EUROPE 3189 1 Order Now

Distributor reported inventory date: 2019-04-19

Distributor Name

DIGIKEY

Stock

3547

Min.Order

1

Region

WORLDWIDE Order Now

AVNET

Stock

3000

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

3000

Min.Order

3000

Region

AMERICA Order Now

MOUSER

Stock

1693

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

3189

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-04-19

Get sample

ST1S50PUR

Package

DFN10 3X3

Packing Type

Tape And Reel

Unit Price (US$)

0.788*

Distributor availability ofST1S50PUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 3547 1 Order Now
AVNET AMERICA 3000 0 Order Now
ARROW AMERICA 3000 3000 Order Now
MOUSER WORLDWIDE 1693 1 Order Now
Farnell Element14 EUROPE 3189 1 Order Now

Distributor reported inventory date: 2019-04-19

Distributor Name

DIGIKEY

Stock

3547

Min.Order

1

Region

WORLDWIDE Order Now

AVNET

Stock

3000

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

3000

Min.Order

3000

Region

AMERICA Order Now

MOUSER

Stock

1693

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

3189

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-04-19

Marketing Status

Active

Unit Price (US$)

0.788

Quantity

1000

ECCN (US)

EAR99

Country of Origin

-

(*) 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

Evaluation Tools

    • Part Number

      4 A step-down switching evaluation board based on the ST1S50

00 Files selected for download

Technical Documentation

    • Description Version Size Action
      DS10105
      4 A monolithic synchronous step-down switching converter with high efficiency at light load
      4.0
      701.19 KB
      PDF
      DS10105

      4 A monolithic synchronous step-down switching converter with high efficiency at light load

Publications and Collaterals

    • Description Version Size Action
      Brochure Power management guide 10.2018
      4.42 MB
      PDF
      Electric vehicle (EV) ecosystem 1.1
      1.28 MB
      PDF
      Switching Converters (DC-DC) – Quick Reference Guide 1.0
      481.92 KB
      PDF

      Brochure Power management guide

      Electric vehicle (EV) ecosystem

      Switching Converters (DC-DC) – Quick Reference Guide

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
ST1S50PUR
Active
DFN10 3X3 Industrial Ecopack2

ST1S50PUR

Package:

DFN10 3X3

Material Declaration**:

PDF XML

Marketing Status

Active

Package

DFN10 3X3

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.