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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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Evaluation Tools

    • Part Number

      3 A synchronous 900 kHz step-down DC-DC converter with inhibit function based on the ST1S10 (Power SO-8)

      3 A synchronous 900 kHz step-down DC-DC converter with inhibit function based on the ST1S10 (DFN)

00 Files selected for download

Technical Documentation

    • Description Version Size Action
      DS5438
      3 A, 900 kHz, monolithic synchronous step-down regulator IC
      7.0
      1.86 MB
      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
      PDF
      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

    • 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**
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.

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
ST1S10PHR Available at 8 distributors

Distributor availability ofST1S10PHR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 14621 1 Order Now
COMPEL EUROPE 15717 1 Order Now
RS COMPONENTS EUROPE 1920 5 Order Now
FUTURE WORLDWIDE 2500 2500 Order Now
ARROW EUROPE 17500 0 Order Now
MOUSER WORLDWIDE 3857 1 Order Now
Farnell Element14 EUROPE 3373 1 Order Now
ANGLIA Live EUROPE 5245 1 Order Now

Distributor reported inventory date: 2020-08-02

Distributor Name

DIGIKEY

Stock

14621

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

15717

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

1920

Min.Order

5

Region

EUROPE Order Now

FUTURE

Stock

2500

Min.Order

2500

Region

WORLDWIDE Order Now

ARROW

Stock

17500

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

3857

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

3373

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

5245

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-08-02

Sample & Buy Buy now
Active
EAR99 NEC Tape And Reel PowerSO-8 -25 125 CHINA 0.693 / 1k
ST1S10PUR Available at 6 distributors

Distributor availability ofST1S10PUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 9513 1 Order Now
COMPEL EUROPE 17626 1 Order Now
RS COMPONENTS EUROPE 3025 5 Order Now
FUTURE WORLDWIDE 14069 1 Order Now
ARROW EUROPE 4500 0 Order Now
MOUSER WORLDWIDE 62 1 Order Now

Distributor reported inventory date: 2020-08-02

Distributor Name

DIGIKEY

Stock

9513

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

17626

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

3025

Min.Order

5

Region

EUROPE Order Now

FUTURE

Stock

14069

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

4500

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

62

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-08-02

Sample & Buy Buy now
Active
EAR99 NEC Tape And Reel DFN8 4x4 -25 125 MALAYSIA 0.693 / 1k

ST1S10PHR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.693 / 1k

Distributor availability ofST1S10PHR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 14621 1 Order Now
COMPEL EUROPE 15717 1 Order Now
RS COMPONENTS EUROPE 1920 5 Order Now
FUTURE WORLDWIDE 2500 2500 Order Now
ARROW EUROPE 17500 0 Order Now
MOUSER WORLDWIDE 3857 1 Order Now
Farnell Element14 EUROPE 3373 1 Order Now
ANGLIA Live EUROPE 5245 1 Order Now

Distributor reported inventory date: 2020-08-02

Distributor Name

DIGIKEY

Stock

14621

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

15717

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

1920

Min.Order

5

Region

EUROPE Order Now

FUTURE

Stock

2500

Min.Order

2500

Region

WORLDWIDE Order Now

ARROW

Stock

17500

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

3857

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

3373

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

5245

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-08-02

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

PowerSO-8

Operating Temperature (°C)

(min)

-25

(max)

125

Budgetary Price (US$)* / Qty

0.693 / 1k

Country of Origin

CHINA

ST1S10PUR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.693 / 1k

Distributor availability ofST1S10PUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 9513 1 Order Now
COMPEL EUROPE 17626 1 Order Now
RS COMPONENTS EUROPE 3025 5 Order Now
FUTURE WORLDWIDE 14069 1 Order Now
ARROW EUROPE 4500 0 Order Now
MOUSER WORLDWIDE 62 1 Order Now

Distributor reported inventory date: 2020-08-02

Distributor Name

DIGIKEY

Stock

9513

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

17626

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

3025

Min.Order

5

Region

EUROPE Order Now

FUTURE

Stock

14069

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

4500

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

62

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-08-02

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

DFN8 4x4

Operating Temperature (°C)

(min)

-25

(max)

125

Budgetary Price (US$)* / Qty

0.693 / 1k

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