Monolithic synchronous step-down regulator

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  • The ST1S10 is a high efficiency step-down PWM current mode switching regulator capable of providing up to 3 A of output current. The device operates with an input supply range from 2.5 V to 18 V and provides an adjustable output voltage from 0.8 V (VFB) to 0.85 * VIN_SW[VOUT= VFB * (1 + R1/R2)]. It operates either at a 900 kHz fixed frequency or can be synchronized to an external clock (from 400 kHz to 1.2 MHz). The high switching frequency allows the use of tiny SMD external components, while the integrated synchronous rectifier eliminates the need for a Schottky diode. The ST1S10 provides excellent transient response, and is fully protected against thermal overheating, switching overcurrent and output short-circuit.

    The ST1S10 is the ideal choice for point of load regulators or LDO pre-regulation.

    Key Features

    • Step-down current mode PWM regulator
    • Output voltage adjustable from 0.8 V
    • Input voltage from 2.5 V up to 18 V
    • 2% DC output voltage tolerance
    • Synchronous rectification
    • Inhibit function
    • Synchronizable switching frequency from 400 kHz up to 1.2 MHz
    • Internal soft start
    • Dynamic short-circuit protection
    • Typical efficiency: 90%
    • 3 A output current capability
    • Standby supply current: max. 6 μA over temperature range
    • Operative junction temp.: from -40 °C to 125 °C

Circuit Diagram

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ST1S10PHR PowerSO-8 Tape And Reel
Active
0.693 10000 EAR99 CHINA Check Availability

Distributor availability ofST1S10PHR

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DIGIKEY WORLDWIDE 2798 1 Order Now
RS COMPONENTS EUROPE 2015 5 Order Now
AVNET AMERICA 4 0 Order Now
ARROW EUROPE 5000 0 Order Now
MOUSER WORLDWIDE 6256 1 Order Now
Farnell Element14 EUROPE 2468 1 Order Now
ANGLIA Live EUROPE 9419 1 Order Now

Distributor reported inventory date: 2019-08-21

Distributor Name

DIGIKEY

Stock

2798

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1

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WORLDWIDE Order Now

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2015

Min.Order

5

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EUROPE Order Now

AVNET

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4

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

5000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

6256

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2468

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

9419

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-08-21

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ST1S10PUR DFN8 4x4 Tape And Reel
Active
0.693 10000 EAR99 MALAYSIA Check Availability

Distributor availability ofST1S10PUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 8122 1 Order Now
RS COMPONENTS EUROPE 5450 5 Order Now
FUTURE WORLDWIDE 24219 1 Order Now
MOUSER WORLDWIDE 16739 1 Order Now

Distributor reported inventory date: 2019-08-21

Distributor Name

DIGIKEY

Stock

8122

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

5450

Min.Order

5

Region

EUROPE Order Now

FUTURE

Stock

24219

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

16739

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-08-21

Get sample

ST1S10PHR

Package

PowerSO-8

Packing Type

Tape And Reel

Unit Price (US$)

0.693*

Distributor availability ofST1S10PHR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2798 1 Order Now
RS COMPONENTS EUROPE 2015 5 Order Now
AVNET AMERICA 4 0 Order Now
ARROW EUROPE 5000 0 Order Now
MOUSER WORLDWIDE 6256 1 Order Now
Farnell Element14 EUROPE 2468 1 Order Now
ANGLIA Live EUROPE 9419 1 Order Now

Distributor reported inventory date: 2019-08-21

Distributor Name

DIGIKEY

Stock

2798

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2015

Min.Order

5

Region

EUROPE Order Now

AVNET

Stock

4

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

5000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

6256

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2468

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

9419

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-08-21

Marketing Status

Active

Unit Price (US$)

0.693

Quantity

10000

ECCN (US)

EAR99

Country of Origin

CHINA

ST1S10PUR

Package

DFN8 4x4

Packing Type

Tape And Reel

Unit Price (US$)

0.693*

Distributor availability ofST1S10PUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 8122 1 Order Now
RS COMPONENTS EUROPE 5450 5 Order Now
FUTURE WORLDWIDE 24219 1 Order Now
MOUSER WORLDWIDE 16739 1 Order Now

Distributor reported inventory date: 2019-08-21

Distributor Name

DIGIKEY

Stock

8122

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

5450

Min.Order

5

Region

EUROPE Order Now

FUTURE

Stock

24219

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

16739

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-08-21

Marketing Status

Active

Unit Price (US$)

0.693

Quantity

10000

ECCN (US)

EAR99

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

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00 Files selected for download

Technical Documentation

    • Description Version Size Action
      DS5438
      3 A, 900 kHz, monolithic synchronous step-down regulator IC
      6.0
      768.85 KB
      PDF
      DS5438

      3 A, 900 kHz, monolithic synchronous step-down regulator IC

    • Description Version Size Action
      AN2620
      3 A high-frequency synchronous 900 kHz step-down converter based on the ST1S10
      3.1
      1.23 MB
      PDF
      AN2754
      Buck high-brightness LED driver based on the ST1S10 step-down DC-DC converter voltage regulator
      1.0
      302.1 KB
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      AN2620

      3 A high-frequency synchronous 900 kHz step-down converter based on the ST1S10

      AN2754

      Buck high-brightness LED driver based on the ST1S10 step-down DC-DC converter voltage regulator

Publications and Collaterals

    • Description Version Size Action
      Electric vehicle (EV) ecosystem 1.1
      1.28 MB
      PDF
      Switching Converters (DC-DC) – Quick Reference Guide 1.0
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Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
ST1S10PHR
Active
PowerSO-8 Industrial Ecopack2
ST1S10PUR
Active
DFN8 4x4 Industrial Ecopack2

ST1S10PHR

Package:

PowerSO-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

PowerSO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

ST1S10PUR

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.