ST1S50

Active

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

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Related Applications

Energy generation and distribution

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

    • 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**
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.

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
ST1S50PUR Available at 6 distributors

Distributor availability ofST1S50PUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 3013 1 Order Now
ARROW EUROPE 3000 0 Order Now
Newark Element14 AMERICA 342 0 Order Now
MOUSER WORLDWIDE 3496 1 Order Now
Farnell Element14 EUROPE 3090 1 Order Now
ANGLIA Live EUROPE 5500 1 Order Now

Distributor reported inventory date: 2020-08-02

Distributor Name

DIGIKEY

Stock

3013

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

3000

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

342

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

3496

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

3090

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

5500

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-08-02

Sample & Buy Buy now
Active
EAR99 NEC Tape And Reel DFN10 3X3 - - CHINA 0.788 / 1k

ST1S50PUR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.788 / 1k

Distributor availability ofST1S50PUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 3013 1 Order Now
ARROW EUROPE 3000 0 Order Now
Newark Element14 AMERICA 342 0 Order Now
MOUSER WORLDWIDE 3496 1 Order Now
Farnell Element14 EUROPE 3090 1 Order Now
ANGLIA Live EUROPE 5500 1 Order Now

Distributor reported inventory date: 2020-08-02

Distributor Name

DIGIKEY

Stock

3013

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

3000

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

342

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

3496

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

3090

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

5500

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-08-02

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

DFN10 3X3

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

0.788 / 1k

Country of Origin

CHINA

(*) 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