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

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
  • RDSON typ. 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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Resources

Technical Documentation

Product Specifications
Description Version Size
Synchronous rectification with enable, 0.7 A, 1.7 MHz fixed or adjustable step-down switching regulator in TSOT23-5L 5.0 325 KB
Application Notes
Description Version Size
ST1S12 small synchronous buck converter 1.2 264 KB

Publications and Collaterals

Brochures
Description Version Size
Brochure Power management guide 09.2017 3 MB

Tools and Software

Evaluation Tools
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Sample & Buy

Part Number Package Packing Type Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
ST1S12G18R TSOT23-5L Tape And Reel Active 0.343 1000 NEC EAR99 - MORE INFO Get Sample Add to cart DISTRIBUTOR AVAILABILITY
ST1S12GR TSOT23-5L Tape And Reel Active 0.343 1000 NEC EAR99 MALAYSIA MORE INFO DISTRIBUTOR AVAILABILITY
ST1S12G12R TSOT23-5L Tape And Reel Active 0.343 1000 NEC EAR99 MALAYSIA MORE INFO DISTRIBUTOR AVAILABILITY
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(*) 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

Quality & Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
ST1S12G18R Active TSOT23-5LIndustrialEcopack2 0 0
ST1S12GR Active TSOT23-5LIndustrialEcopack2 0 0
ST1S12G12R Active TSOT23-5LIndustrialEcopack2
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(**) 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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