0.7 A / 1.2 V synchronous buck converter with enable function based on the ST1S12XX

This demonstration board is based on the ST1S12 family of synchronous step-down DC-DC converters optimized for powering low-voltage digital cores in HDD (hard disk drive) applications and is generally used to replace high-current linear solutions when 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 of 1.7 MHz allows the use of tiny surface-mount components. For the adjustable version, a resistor divider to set the output voltage value, an inductor, and two capacitors are required. Only an inductor and 2 capacitors are needed for the 1.2 V and 1.8 V fixed version. A low output ripple is guaranteed by the current mode PWM topology and by the use of low ESR surface-mount ceramic capacitors.

The ST1S12 device is thermal protected and current limited to prevent damage due to accidental short-circuit. This family of products is available in the TSOT23-5L package.

Key Features

  • RDS(on) typ. 250 m and 400 m
  • Not switching quiescent current: max 600 μA over temperature range
  • Uses tiny capacitors and inductors
  • Internal soft-start
  • Enable function
  • Step-down current mode PWM (1.7 MHz) DCDC converter
  • 0.7 A output current capability
  • Fixed output voltage of 1.2 V
  • Synchronous rectification
  • Typical efficiency: > 90%
  • 3% DC output voltage tolerance

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デザイン

技術文書

製品スペック
Description バージョン サイズ
DB0691 DB0691: 0.7 A / 1.2 V synchronous buck converter with enable function based on the ST1S12XX 1.2 72 KB

ハードウェアリソース

Board Manufacturing Specifications
Description バージョン サイズ
Gerber files for STEVAL-ISA055V1 board 1.0 185 KB
Bill of Materials
Description バージョン サイズ
BOM for STEVAL-ISA055V1 board 1.0 44 KB
Schematic Packs
Description バージョン サイズ
Board schematics for STEVAL-ISA055V1 board 1.0 35 KB

法務

ライセンス契約
Description バージョン サイズ
Evaluation products license agreement 1.0 125 KB
サポート & コミュニティ

サンプル & 購入

製品型番 Core Product Marketing Status Unit Price (US$) * 数量 ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
STEVAL-ISA055V1 ST1S12GR Active 30.63 1 NEC EAR99 ITALY MORE INFO 直接購入 買い物かごに追加 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

品質 & 信頼性

製品型番 Marketing Status パッケージ Grade RoHS Compliance Grade Material Declaration**
STEVAL-ISA055V1 アクティブCARDIndustrialEcopack2
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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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