ST1S03

Active

1.5 A, 1.5 MHz adjustable, step-down switching regulator

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  • The ST1S03 is a step-down DC-DC converter optimized for powering a low voltage digital core in HDD applications and, generally, to replace the high current linear solution when the power dissipation may cause a high heating of the application environment. It provides up to 1.5 A over an input voltage range of 3 V to 16 V. A high switching frequency (1.5 MHz) allows the use of tiny surface-mount components: as well as the resistor divider to set the output voltage value, only an inductor, a Schottky diode and two capacitors are required. Besides, a low output ripple is guaranteed by the current mode PWM topology and by the use of low ESR SMD ceramic capacitors. The device is thermal protected and current limited to prevent damages due to an accidental short-circuit. The ST1S03 device is available in a DFN6D package.

    Key Features

    • Step-down current mode PWM (1.5 MHz) DC-DC converter
    • 2% DC output voltage tolerance
    • Internal soft-start for STARTUP current limitation and power on delay of 50 - 100 μs
    • Typical efficiency: > 70% over all operating conditions
    • 1.5 A output current capability
    • Not switching quiescent current: max 2.5 mA over temperature range
    • Switch VDS: max. 350 mV at ISW= 750 mA
    • Uses tiny capacitors and inductors
    • Available in DFN6D 3 x 3 mm package with exposed pad

Circuit Diagram

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Evaluation Tools

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      1.5 A / 3.3 V step-down DC-DC converter demonstration board based on the ST1S03

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Technical Documentation

    • Description Version Size Action
      DS4126
      1.5 A, 1.5 MHz adjustable, step-down switching regulator
      7.0
      596.11 KB
      PDF
      DS4126

      1.5 A, 1.5 MHz adjustable, step-down switching regulator

    • Description Version Size Action
      AN2837
      Positive to negative buck-boost converter using ST1S03 asynchronous switching regulator
      1.1
      536.05 KB
      PDF
      AN2093
      ST1S03 buck converters for HDD power supplies
      2.4
      232.69 KB
      PDF
      AN2837

      Positive to negative buck-boost converter using ST1S03 asynchronous switching regulator

      AN2093

      ST1S03 buck converters for HDD power supplies

    • 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

    • Description Version Size Action
      DN0011
      ST1S03 alternative topology: Using a buck in a negative buck-boost configuration
      1.2
      361.3 KB
      PDF
      DN0011

      ST1S03 alternative topology: Using a buck in a negative buck-boost configuration

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**
ST1S03PUR
Active
DFN6 3x3 Industrial Ecopack2

ST1S03PUR

Package:

DFN6 3x3

Material Declaration**:

PDF XML

Marketing Status

Active

Package

DFN6 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
Package
Packing Type
Marketing Status
ECCN (US)
Country of Origin
Budgetary Price (US$)*/Qty
ST1S03PUR Available at 6 distributors

Distributor availability ofST1S03PUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 17544 1 Order Now
COMPEL EUROPE 888 1 Order Now
RS COMPONENTS EUROPE 9770 1 Order Now
Newark Element14 AMERICA 100 0 Order Now
MOUSER WORLDWIDE 5789 1 Order Now
Farnell Element14 EUROPE 887 1 Order Now

Distributor reported inventory date: 2020-07-09

Distributor Name

DIGIKEY

Stock

17544

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

888

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

9770

Min.Order

1

Region

EUROPE Order Now

Newark Element14

Stock

100

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

5789

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

887

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-09

Get sample DFN6 3x3 Tape And Reel
Active
EAR99 PHILIPPINES 0.566 / 1k

ST1S03PUR

Package

DFN6 3x3

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.566 / 1k

Distributor availability ofST1S03PUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 17544 1 Order Now
COMPEL EUROPE 888 1 Order Now
RS COMPONENTS EUROPE 9770 1 Order Now
Newark Element14 AMERICA 100 0 Order Now
MOUSER WORLDWIDE 5789 1 Order Now
Farnell Element14 EUROPE 887 1 Order Now

Distributor reported inventory date: 2020-07-09

Distributor Name

DIGIKEY

Stock

17544

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

888

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

9770

Min.Order

1

Region

EUROPE Order Now

Newark Element14

Stock

100

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

5789

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

887

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-09

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.566 / 1k

ECCN (US)

EAR99

Country of Origin

PHILIPPINES

(*) 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