STMicroelectronics STEVAL-ISA075V1

Overview

STEVAL-ISA075V1 from STMicroelectronics is an evaluation board for the L6738 single-phase step-down controller, designed to validate high-efficiency DC-DC converter operation with up to 8 A output current, 600 kHz switching frequency, and input voltage below 6 V in a compact 25.4 mm × 14.6 mm 4-layer PCB layout.

For engineers reviewing the STEVAL-ISA075V1 datasheet, STEVAL-ISA075V1 pinout, STEVAL-ISA075V1 application, or STEVAL-ISA075V1 equivalent, this board supports rapid prototyping of point-of-load (POL) converters for FPGA, ASIC, and microprocessor core power delivery where space-constrained, high-current regulation is required.

Technical Context

The board implements a synchronous buck topology using the L6738 controller IC, which integrates high-current gate drivers and delivers precise voltage regulation via external MOSFETs (e.g., STL15N3LLH5 high-side and STS9D8NH3LL low-side) and dual chokes (e.g., WE 744310095). It supports adjustable output voltage down to 0.8 V with feedback through a resistor divider network.

Power sequencing is managed via PGOOD signal assertion, and protection features include overcurrent sensing (CSP/CSN), thermal monitoring (VSEN/VSS_SENSE), and undervoltage lockout. The board accepts input via screw terminal or solder pads and provides regulated output at test points and edge connectors.

Key Specifications

Availability

STEVAL-ISA075V1 is available at Aetrix Electronics and suitable for FPGA power delivery, ASIC core supply, microprocessor VRM validation, and industrial embedded POL converter development requiring stable component supply and fast design iteration.

Supply support for STEVAL-ISA075V1 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, Switzerland, specializing in power management, microcontrollers, sensors, and analog solutions for industrial, automotive, and consumer markets.

The STEVAL-ISA075V1 belongs to ST's ST Evaluation Board product line, developed to accelerate adoption of its high-performance power controllers like the L6738 in demanding point-of-load applications.

FAQ

What is the primary function of the STEVAL-ISA075V1?

The STEVAL-ISA075V1 is a fully assembled evaluation board that demonstrates the L6738 single-phase synchronous buck controller in a compact, thermally optimized layout. It enables engineers to verify voltage regulation accuracy, transient response, efficiency, and protection behavior under real load conditions without designing a custom PCB.

Which controller IC does this board evaluate?

This board evaluates the L6738 - a high-frequency, single-phase step-down controller with integrated high-current gate drivers, programmable soft-start, PGOOD output, and comprehensive fault protection including overcurrent, overtemperature, and undervoltage lockout.

Can the output voltage be adjusted, and how?

Yes, the output voltage is adjustable from 0.8 V upward using an external resistor divider on the FB pin. The reference voltage is 0.8 V, and R9/R13 values are selected per the formula R13 = 0.8 V × R9 / (VOUT − 0.8 V), as documented in the schematic and data brief.

Does the board support thermal monitoring and fault reporting?

Yes, it supports thermal monitoring via the VSEN and VSS_SENSE pins connected to an external NTC thermistor, and fault reporting via the open-drain PGOOD signal, which asserts high only when output voltage is within ±5% regulation window and no faults are detected.