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

Download datasheet

Order from our eStore and our distributors

Buy now
Overview
Tools & Software
Resources
Solutions
Quality & Reliability
Sales Briefcase
eDesignSuite
Get Started
Sample & Buy
Partner products
  • 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

Sample & Buy

Part Number
Package
Packing Type
Marketing Status
Budgetary Price (US$)*
Quantity
ECCN (US)
Country of Origin
Order from Distributors
Order from ST
ST1S09IPUR DFN6 3x3 Tape And Reel
Active
0.625 10000 EAR99 PHILIPPINES Check Availability

Distributor availability ofST1S09IPUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2152 1 Order Now
ARROW AMERICA 848 1 Order Now
MOUSER WORLDWIDE 2823 1 Order Now

Distributor reported inventory date: 2019-09-20

Distributor Name

DIGIKEY

Stock

2152

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

848

Min.Order

1

Region

AMERICA Order Now

MOUSER

Stock

2823

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-09-20

Buy now
ST1S09PUR DFN6 3x3 Tape And Reel
Active
0.713 10000 EAR99 PHILIPPINES Check Availability

Distributor availability ofST1S09PUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2997 1 Order Now
ARROW AMERICA 3000 3000 Order Now
MOUSER WORLDWIDE 3962 1 Order Now
Farnell Element14 EUROPE 2900 1 Order Now

Distributor reported inventory date: 2019-09-20

Distributor Name

DIGIKEY

Stock

2997

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

3000

Min.Order

3000

Region

AMERICA Order Now

MOUSER

Stock

3962

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2900

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-09-20

Buy now

ST1S09IPUR

Package

DFN6 3x3

Packing Type

Tape And Reel

Unit Price (US$)

0.625*

Distributor availability ofST1S09IPUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2152 1 Order Now
ARROW AMERICA 848 1 Order Now
MOUSER WORLDWIDE 2823 1 Order Now

Distributor reported inventory date: 2019-09-20

Distributor Name

DIGIKEY

Stock

2152

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

848

Min.Order

1

Region

AMERICA Order Now

MOUSER

Stock

2823

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-09-20

Marketing Status

Active

Unit Price (US$)

0.625

Quantity

10000

ECCN (US)

EAR99

Country of Origin

PHILIPPINES

ST1S09PUR

Package

DFN6 3x3

Packing Type

Tape And Reel

Unit Price (US$)

0.713*

Distributor availability ofST1S09PUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2997 1 Order Now
ARROW AMERICA 3000 3000 Order Now
MOUSER WORLDWIDE 3962 1 Order Now
Farnell Element14 EUROPE 2900 1 Order Now

Distributor reported inventory date: 2019-09-20

Distributor Name

DIGIKEY

Stock

2997

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

3000

Min.Order

3000

Region

AMERICA Order Now

MOUSER

Stock

3962

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2900

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-09-20

Marketing Status

Active

Unit Price (US$)

0.713

Quantity

10000

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

Featured Products

Recommended for you

Evaluation Tools

    • Part Number

      2 A / 3.3 V high-efficiency synchronous buck converter evaluation board based on the ST1S09

      2 A / 3.3 V high-efficiency synchronous buck converter evaluation board based on the ST1S09I with inhibit

00 Files selected for download

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

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
      481.92 KB
      PDF

      Electric vehicle (EV) ecosystem

      Switching Converters (DC-DC) – Quick Reference Guide

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.