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 10000 EAR99 - Check Availability

Distributor availability ofST1S50PUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 3240 1 Order Now
AVNET AMERICA 3000 0 Order Now
ARROW AMERICA 3000 3000 Order Now
MOUSER WORLDWIDE 3691 1 Order Now
Farnell Element14 EUROPE 1909 1 Order Now
ANGLIA Live EUROPE 6000 1 Order Now

Distributor reported inventory date: 2019-07-16

Distributor Name

DIGIKEY

Stock

3240

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

3691

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1909

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

6000

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-07-16

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 3240 1 Order Now
AVNET AMERICA 3000 0 Order Now
ARROW AMERICA 3000 3000 Order Now
MOUSER WORLDWIDE 3691 1 Order Now
Farnell Element14 EUROPE 1909 1 Order Now
ANGLIA Live EUROPE 6000 1 Order Now

Distributor reported inventory date: 2019-07-16

Distributor Name

DIGIKEY

Stock

3240

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

3691

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1909

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

6000

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-07-16

Marketing Status

Active

Unit Price (US$)

0.788

Quantity

10000

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

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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

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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.