ST1S09

Active

Synchronous rectification with inhibit, 2 A, 1.5 MHz adjustable, step-down switching regulator

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  • The ST1S09 is a step-down DC-DC converter optimized for powering low output voltage applications. It supplies a current in excess of 2 A over an input voltage range from 2.7 V to 6 V.

    A high PWM switching frequency (1.5 MHz) allows the use of tiny surface-mount components.
    Moreover, since the required synchronous rectifier is integrated, the number of the external components is reduced to minimum: a resistor divider, an inductor and two capacitors. The Power Good function continuously monitors the output voltage. An open drain Power Good flag is released when the output voltage is within regulation. In addition, 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 thermally protected and the output current limited to prevent damages due to accidental short circuit. The ST1S09 is available in the DFN6 (3 x 3 mm) package.

    Key Features

    • Operating junction temp. -30 °C to 125 °C
    • Utilizes tiny capacitors and inductors
    • Available in DFN6 (3 x 3 mm) exposed pad
    • Non switching quiescent current: (typ) 1.5 mA over temperature range
    • Integrated output over-voltage protection
    • 1.5 MHz fixed frequency PWM with current control mode
    • Typical efficiency: > 90%
    • 2 A output current capability
    • Two versions available: power good or inhibit
    • RDSON (typ) 100 mΩ
    • 2 % DC output voltage tolerance

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Technical Documentation

    • Description Version Size Action
      DS5342
      2 A, 1.5 MHz PWM step-down switching regulator with synchronous rectification
      4.1
      379.32 KB
      PDF
      DS5342

      2 A, 1.5 MHz PWM step-down switching regulator with synchronous rectification

    • 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**
ST1S09IPUR
Active
DFN6 3x3 Industrial Ecopack2
ST1S09PUR
Active
DFN6 3x3 Industrial Ecopack2

ST1S09IPUR

Package:

DFN6 3x3

Material Declaration**:

PDF XML

Marketing Status

Active

Package

DFN6 3x3

Grade

Industrial

RoHS Compliance Grade

Ecopack2

ST1S09PUR

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
ST1S09IPUR Available at 5 distributors

Distributor availability ofST1S09IPUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2962 1 Order Now
COMPEL EUROPE 970 1 Order Now
ARROW AMERICA 538 1 Order Now
MOUSER WORLDWIDE 3189 1 Order Now
Farnell Element14 EUROPE 3000 1 Order Now

Distributor reported inventory date: 2020-07-08

Distributor Name

DIGIKEY

Stock

2962

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

970

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

538

Min.Order

1

Region

AMERICA Order Now

MOUSER

Stock

3189

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

3000

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-08

Buy now DFN6 3x3 Tape And Reel
Active
EAR99 PHILIPPINES 0.625 / 1k
ST1S09PUR Available at 3 distributors

Distributor availability ofST1S09PUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1385 1 Order Now
MOUSER WORLDWIDE 952 1 Order Now
Farnell Element14 EUROPE 2481 1 Order Now

Distributor reported inventory date: 2020-07-08

Distributor Name

DIGIKEY

Stock

1385

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

952

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2481

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-08

Buy now DFN6 3x3 Tape And Reel
Active
EAR99 PHILIPPINES 0.713 / 1k

ST1S09IPUR

Package

DFN6 3x3

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.625 / 1k

Distributor availability ofST1S09IPUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2962 1 Order Now
COMPEL EUROPE 970 1 Order Now
ARROW AMERICA 538 1 Order Now
MOUSER WORLDWIDE 3189 1 Order Now
Farnell Element14 EUROPE 3000 1 Order Now

Distributor reported inventory date: 2020-07-08

Distributor Name

DIGIKEY

Stock

2962

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

970

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

538

Min.Order

1

Region

AMERICA Order Now

MOUSER

Stock

3189

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

3000

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-08

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.625 / 1k

ECCN (US)

EAR99

Country of Origin

PHILIPPINES

ST1S09PUR

Package

DFN6 3x3

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.713 / 1k

Distributor availability ofST1S09PUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1385 1 Order Now
MOUSER WORLDWIDE 952 1 Order Now
Farnell Element14 EUROPE 2481 1 Order Now

Distributor reported inventory date: 2020-07-08

Distributor Name

DIGIKEY

Stock

1385

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

952

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2481

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-08

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.713 / 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