STMicroelectronics STEVAL-ISA083V1

Overview

STEVAL-ISA083V1 from STMicroelectronics is a demonstration board for the ST1S40IPUR synchronous step-down DC-DC converter, delivering 3.3 V at up to 4 A from a 4–18 V input, operating at fixed 800 kHz PWM frequency with enable control and short-circuit protection.

For engineers reviewing the STEVAL-ISA083V1 datasheet, STEVAL-ISA083V1 pinout, STEVAL-ISA083V1 application, or STEVAL-ISA083V1 equivalent, this board enables rapid evaluation of high-efficiency, internally compensated buck conversion in space-constrained industrial and embedded power supplies.

Technical Context

The board implements peak current-mode control using the ST1S40IPUR, which integrates a 95 mΩ high-side MOSFET and 69 mΩ synchronous rectifier - enabling >90% efficiency at 3.3 V/4 A output with minimal external components. Internal compensation eliminates the need for external loop compensation networks.

Protection features include cycle-by-cycle overcurrent limiting and current foldback with frequency reduction during short-circuit events. The enable (ON/OFF) function supports precise system-level power sequencing and standby control.

Key Specifications

Availability

STEVAL-ISA083V1 is available at Aetrix Electronics and suitable for industrial PLCs, embedded computing power rails, and FPGA core voltage regulation requiring stable component supply and fast evaluation turnaround.

Supply support for STEVAL-ISA083V1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, MCU, power, and sensor solutions for industrial, automotive, and consumer applications.

The STEVAL-ISA083V1 belongs to ST's STEVAL demonstration board portfolio, engineered to accelerate validation of ST's integrated power ICs in real-world DC-DC conversion use cases.

FAQ

What is the primary function of the STEVAL-ISA083V1?

The STEVAL-ISA083V1 is a demonstration board that implements the ST1S40IPUR synchronous step-down converter to deliver a regulated 3.3 V / 4 A output from a 4–18 V input. It is not a standalone IC but a fully assembled, tested reference design for evaluating buck converter performance, thermal behavior, and layout best practices.

Does the board support adjustable output voltage?

No - the STEVAL-ISA083V1 is configured for fixed 3.3 V output via resistor feedback network per the ST1S40IPUR's internal reference. Output voltage adjustment would require modifying the feedback resistors and verifying stability, which is not supported out-of-box on this demo board.

Can the enable (ON/OFF) pin be used for power sequencing?

Yes - the EN pin is brought out to a test point and supports TTL-compatible logic levels (active-high). It allows precise system-level control of power-up timing, standby mode entry, and synchronization with other subsystems in multi-rail designs.

Is thermal performance characterized in the data brief?

Yes - the data brief confirms operation at 4 A continuous output under standard conditions. The board uses optimized copper pour and thermal vias to dissipate heat from the ST1S40IPUR's exposed pad, achieving acceptable junction temperatures without forced airflow when mounted per recommended layout guidelines.