1.5 A / 3.3 V step-down DC-DC converter demonstration board based on the ST1S03

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.

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 Iout lower than 15 mA, to maintain the regulation with light loads
  • RoHS compliant

Design

Technical Documentation

Product Specifications
Description Version Size
DB1132 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

Presentations
Description Version Size
Evaluation board presentation 1.1 431 KB

Hardware Resources

Board Manufacturing Specifications
Description Version Size
PCB layout 1.0 31 KB
Bill of Materials
Description Version Size
Bill of materials 1.0 45 KB
Schematic Packs
Description Version Size
Board schematic 1.0 39 KB

Legal

License Agreement
Description Version Size
Evaluation products license agreement 1.0 125 KB
Support & Community

Sample & Buy

Part Number Core Product Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
STEVAL-ISA042V2 ST1S03PUR Active 30.63 1 NEC EAR99 ITALY MORE INFO Buy Direct Add to cart 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**
STEVAL-ISA042V2 ActiveCARDIndustrialEcopack2
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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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