Synchronous rectification with inhibit, 0.7 A, 1.7 MHz adjustable, step-down switching regulator

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  • The ST1S12 is a step down DC-DC converter optimized for powering low-voltage digital cores in HDD applications and, generally, to replace the high current linear solution when the power dissipation may cause high heating of the application environment. It provides up to 0.7 A over an input voltage range of 2.5 V to 5.5 V. A high switching frequency (1.7 MHz) allows the use of tiny surface-mount components. In addition to the resistor divider to set the output voltage value, only an inductor and two capacitors are required. Moreover, 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 current is limited to prevent damage due to accidental short-circuit. The ST1S12 is available in the TSOT23-5L package.

    Key Features

    • Step-down current mode PWM (1.7 MHz) DC-DC converter
    • 3% DC output voltage tolerance
    • Synchronous rectification
    • Fixed output voltage 1.2 V, 1.8 V, and ADJ (available on request 1.5 V, 2.5 V and 3.3 V)
    • Enable function
    • Internal soft start
    • Typical efficiency: > 90%
    • 0.7 A output current capability
    • Not switching quiescent current: max 650 μA over temperature range
    • RDSONtyp. 250 mΩ and 400 mΩ
    • Uses tiny capacitors and inductors
    • Operative junction temp. -40 °C to 125 °C
    • Available in TSOT23-5L package

Circuit Diagram

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ST1S12G18R TSOT23-5L Tape And Reel
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ST1S12G18R

Package

TSOT23-5L

Packing Type

Tape And Reel

Unit Price (US$)

0.343*

Distributor availability ofST1S12G18R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1411 1 Order Now
MOUSER WORLDWIDE 2864 1 Order Now

Distributor reported inventory date: 2019-05-22

Distributor Name

DIGIKEY

Stock

1411

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

2864

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-05-22

Marketing Status

Active

Unit Price (US$)

0.343

Quantity

1000

ECCN (US)

EAR99

Country of Origin

-

ST1S12GR

Package

TSOT23-5L

Packing Type

Tape And Reel

Unit Price (US$)

0.343*

Distributor availability ofST1S12GR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 10763 1 Order Now
AVNET AMERICA 3000 0 Order Now
FUTURE WORLDWIDE 2988 1 Order Now
ARROW EUROPE 10 0 Order Now
ARROW AMERICA 35 1 Order Now
MOUSER WORLDWIDE 4420 1 Order Now
RUTRONIK EUROPE 3000 3000 Order Now

Distributor reported inventory date: 2019-05-22

Distributor Name

DIGIKEY

Stock

10763

Min.Order

1

Region

WORLDWIDE Order Now

AVNET

Stock

3000

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

2988

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

10

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

35

Min.Order

1

Region

AMERICA Order Now

MOUSER

Stock

4420

Min.Order

1

Region

WORLDWIDE Order Now

RUTRONIK

Stock

3000

Min.Order

3000

Region

EUROPE Order Now

Distributor reported inventory date: 2019-05-22

Marketing Status

Active

Unit Price (US$)

0.343

Quantity

1000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

ST1S12G12R

Package

TSOT23-5L

Packing Type

Tape And Reel

Unit Price (US$)

0.343*

Marketing Status

Active

Unit Price (US$)

0.343

Quantity

1000

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
      DS5661
      Synchronous rectification with enable, 0.7 A, 1.7 MHz fixed or adjustable step-down switching regulator in TSOT23-5L
      5.0
      325.2 KB
      PDF
      DS5661

      Synchronous rectification with enable, 0.7 A, 1.7 MHz fixed or adjustable step-down switching regulator in TSOT23-5L

    • Description Version Size Action
      AN2728
      ST1S12 small synchronous buck converter
      1.2
      264.68 KB
      PDF
      AN2728

      ST1S12 small synchronous buck converter

Publications and Collaterals

    • Description Version Size Action
      Brochure Power management guide 10.2018
      4.42 MB
      PDF
      Electric vehicle (EV) ecosystem 1.1
      1.28 MB
      PDF
      Switching Converters (DC-DC) – Quick Reference Guide 1.0
      481.92 KB
      PDF

      Brochure Power management guide

      Electric vehicle (EV) ecosystem

      Switching Converters (DC-DC) – Quick Reference Guide

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
ST1S12G12R
Active
TSOT23-5L Industrial Ecopack2
ST1S12G18R
Active
TSOT23-5L Industrial Ecopack2
ST1S12GR
Active
TSOT23-5L Industrial Ecopack2

ST1S12G12R

Package:

TSOT23-5L

Material Declaration**:

PDF XML

Marketing Status

Active

Package

TSOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

ST1S12G18R

Package:

TSOT23-5L

Material Declaration**:

PDF XML

Marketing Status

Active

Package

TSOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

ST1S12GR

Package:

TSOT23-5L

Material Declaration**:

PDF XML

Marketing Status

Active

Package

TSOT23-5L

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.

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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.