STMicroelectronics STEVAL-ISA104V1

Overview

STEVAL-ISA104V1 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, delivering adjustable output down to 1.22 V, featuring 850 kHz fixed-frequency operation, Power Good open-collector output, and thermal shutdown-used for industrial power supply validation and DC/DC converter design verification.

For engineers reviewing the STEVAL-ISA104V1 datasheet, STEVAL-ISA104V1 pinout, STEVAL-ISA104V1 application, or STEVAL-ISA104V1 equivalent, key selection considerations include input voltage range (5.5–48 V), output current capability (3 A), fixed 850 kHz switching frequency, internal soft-start, and Power Good signaling for system sequencing and fault monitoring.

Technical Context

The board implements the ST1S14 in HSOP8 with exposed frame for thermal performance, supporting high-current step-down conversion without external MOSFETs. It integrates pulse-by-pulse current limiting and foldback protection, enabling robust short-circuit handling during evaluation.

Power Good (PGOOD) is an open-collector output asserting when VOUT reaches ≥90% of regulation; inhibit control enables zero-quiescent-current shutdown. The internal oscillator fixes switching at 850 kHz, minimizing external component count while maintaining EMI predictability.

Key Specifications

Availability

STEVAL-ISA104V1 is available at Aetrix Electronics and suitable for industrial power supply validation, DC/DC converter reference design, and embedded system rail-generation prototyping requiring stable component supply and documented evaluation platform traceability.

Supply support for STEVAL-ISA104V1 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 microcontrollers, analog ICs, power management devices, and evaluation platforms for industrial, automotive, and consumer applications.

This board belongs to ST's STEVAL (ST Evaluation) series, purpose-built to accelerate adoption of ST's monolithic DC/DC regulators by providing fully assembled, tested, and documented hardware with schematics, layout files, and design notes.

FAQ

What is the primary function of the STEVAL-ISA104V1?

The STEVAL-ISA104V1 is a ready-to-use evaluation board for the ST1S14 step-down switching regulator. It provides a complete, tested implementation-including input/output filtering, feedback network, Power Good signaling, and thermal management-to validate performance, optimize PCB layout, and verify system integration before custom design.

Does the board support adjustable output voltage?

Yes. Output voltage is set using an external resistor divider connected to the FB pin, allowing adjustment down to 1.22 V-the internal reference voltage. The board includes footprint options and routing for common resistor values to simplify configuration across multiple rail requirements.

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 pour on the board's bottom layer. This design achieves verified 3 A continuous operation at ambient temperatures up to 60 °C without forced airflow, per the referenced application note and thermal characterization.

Can the STEVAL-ISA104V1 be used for production-level testing?

No-it is intended strictly for engineering evaluation and design validation. While fully functional and representative of ST1S14 behavior, it lacks production-grade conformal coating, extended temperature qualification, or long-term reliability screening. For production, users must implement the ST1S14 in their own certified layout and qualification process.