3 A synchronous 900 kHz step-down DC-DC converter with inhibit function based on the ST1S10 (Power SO-8)

The STEVAL-ISA044V5 is a demonstration board based on the ST1S10 device assembled in a Power SO-8 ePad package. The ST1S10 is a step-down DC-DC converter with the inhibit function optimized for powering high voltages in LCD applications and low voltages in digital-core HDD applications. It replaces the high-current linear solution when high power dissipation is an issue.

It provides up to 3 A over an input voltage range of 2.5 V to 18.0 V, and synchronous rectification removes the need for an external Schottky diode. A high internal switching frequency (900 kHz) allows for the use of tiny surface-mount components, as well as a resistor divider to set the output voltage value. Only an inductor and 3 capacitors are required.

The current-mode PWM architecture and stable operation with low-ESR SMD ceramic capacitors result in low output ripple. To maximize power conversion efficiency in light load, the regulator can work in burst mode automatically. The device can operate in PWM mode with a fixed frequency or synchronized to an external frequency. It switches at a frequency of 900 kHz when the SYNC pin is connected to ground or a fixed voltage (less than 5.5 V), and can synchronize the switching frequency between 400 kHz to 1.2 MHz from an external clock applied to the SYNC pin.

A thermal shutdown circuit is integrated and activates at 150 °C. Cycle-by-cycle current limitation provides protection against shorted outputs. The quiescent current is less than 6 μA in the inhibit state.

Key Features

  • Input voltage range: 2.5 V to 18.0 V
  • Max IOUT : 3 A
  • High internal switching frequency : 900 kHz
  • PWM mode operation with a fixed frequency or synchronized to an external frequency between 400 kHz and 1.2 MHz
  • Inhibit pin available
  • Quiescent current : < 6 μA in inhibit state
  • RoHS compliant

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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
DB1460 DB1460: 3 A synchronous 900 kHz step-down DC-DC converter with inhibit function based on the ST1S10 (Power SO-8) 1.1 338 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-ISA044V5 1.0 109 KB
Bill of Materials
Description バージョン サイズ
STEVAL-ISA044V5 BOM 2.1 7 KB
Schematic Packs
Description バージョン サイズ
STEVAL-ISA044V5 schematics 1.0 21 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-ISA044V5 ST1S10 Active 36.75 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-ISA044V5 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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