STMicroelectronics STEVAL-ISA095V1

Overview

STEVAL-ISA095V1 from STMicroelectronics is an evaluation board for the ST1S14 3 A step-down monolithic switching regulator, operating from 5.5 V to 48 V input, with fixed 850 kHz switching frequency, internal soft-start, and Power Good open-collector output. It supports adjustable output voltage starting at 1.22 V and features pulse-by-pulse current limiting and thermal shutdown.

For engineers reviewing the STEVAL-ISA095V1 datasheet, STEVAL-ISA095V1 pinout, STEVAL-ISA095V1 application, or STEVAL-ISA095V1 equivalent, this board enables rapid validation of high-current DC-DC conversion in industrial power supplies, automotive subsystems, and distributed power architectures where input voltage range and thermal robustness are critical.

Technical Context

The board implements the ST1S14 in HSOP8 package with exposed frame for enhanced thermal dissipation, enabling continuous 3 A output. The regulator uses internal oscillator control (850 kHz), fixed-frequency current-mode architecture, and integrates current-sense, error amplifier, and driver stages on-die.

Power Good signaling confirms regulated output stability via open-collector output; inhibit functionality reduces quiescent current to ≤2 mA during standby. Thermal shutdown and foldback current limiting protect under persistent overload or short-circuit conditions.

Key Specifications

Availability

STEVAL-ISA095V1 is available at Aetrix Electronics and suitable for industrial power supply design, automotive body electronics, and distributed DC-DC conversion requiring stable component supply and validated reference layout.

Supply support for STEVAL-ISA095V1 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 specializing in power management, microcontrollers, sensors, and analog ICs, with strong focus on industrial, automotive, and embedded applications.

The STEVAL-ISA095V1 belongs to ST's STEVAL demonstration board family, designed to accelerate evaluation and integration of ST's high-current DC-DC regulators in real-world power system designs.

FAQ

What is the primary function of the STEVAL-ISA095V1 board?

The STEVAL-ISA095V1 is a dedicated evaluation platform for the ST1S14 3 A step-down switching regulator. It provides a fully assembled, tested circuit with optimized layout, input/output filtering, thermal management, and test points to validate performance across the 5.5–48 V input range and down to 1.22 V output.

Does the board support adjustable output voltage?

Yes - output voltage is set externally using a resistor divider network connected to the FB pin of the ST1S14. The minimum regulated output is 1.22 V (the internal reference voltage), and higher values are achieved by scaling the feedback ratio; no onboard DAC or digital interface is included.

How is thermal performance managed on this evaluation board?

The ST1S14 is mounted in an HSOP8 package with exposed thermal pad soldered directly to a large copper plane on the PCB. This design, combined with the board's 2-layer construction and thermal vias, sustains 3 A output at ambient temperatures up to 70 °C without forced airflow.

Can the Power Good signal be used to sequence other power rails?

Yes - the open-collector Power Good (PG) output asserts when the regulated output reaches ≥90% of target voltage and remains active as long as regulation is maintained. It can drive logic-level inputs or enable pins of downstream regulators via pull-up to compatible voltage domains (e.g., 3.3 V or 5 V).