ST Life.augmented


1.5 A / 3.3 V step-down DC-DC converter demonstration board based on the ST1S03
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The STEVAL-ISA042V2 demonstration board is a step-down DC-DC converter optimized for powering the low-voltage digital core in HDD applications and, more generally, replacing the high-current linear solution when the power dissipation may cause excessive heating of the application environment. It provides up to 1.5 A over an input voltage range of 3 V to 16 V.

A high switching frequency (1.5 MHz) allows the use of tiny surface-mounted components, as well as the use of a resistor divider to set the output voltage value. Only an inductor, a Schottky diode, and two capacitors are required. 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 thermal protected and current limited to prevent damage due to accidental short-circuits.

It uses the ST1S03 device.

The ST1S03 is available in a DFN6 (3x3mm) package.

pdf データシート
Data Brief

Key Features

  • Adjustable current-mode PWM step-down DC-DC converter
  • Output voltage, Vout : 3.3 V
  • Output current, Iout: 1.5 A
  • Internal compensation to eliminate additional components
  • Pulse skipping for Ioutlower than 15 mA, to maintain the regulation with light loads
  • RoHS compliant



Technical Documentation

Product Specifications

Description Version Size
DB1132: 1.5 A / 3.3 V step-down DC-DC converter demonstration board based on the ST1S03
1.1 89 KB

Presentations & Training Material


Description Version Size
Evaluation board presentation
1.1 432 KB

Hardware Resources

Board Manufacturing Specification

Description Version Size
PCB layout
1.0 32 KB

Bill of Materials

Description Version Size
Bill of materials
1.0 45 KB

Schematic Pack

Description Version Size
Board schematic
1.0 39 KB

サンプル& 購入

製品型名 Marketing StatusCore ProductOrder From STUnit Price (US$)*
@ 1
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
STEVAL-ISA042V2ActiveST1S03PURBuy Direct46.55Distributor reported inventory date: 2015-05-28
Distributor NameRegionStockMin. order
Newark Element14Order NowAMERICA30

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(**)弊社ホームページで入手できるMaterial Declaration(材料宣誓書)のフォームは、各パッケージ・タイプで最も一般的に使用されるパッケージに基づいた包括的な文書です。そのため、特定のデバイスについて100%正確ではない可能性があります。特定のデバイスに関する情報については、 弊社セールスオフィス にお問合せ下さい。
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