STMicroelectronics STEVAL-ISA052V1

Overview

STEVAL-ISA052V1 from STMicroelectronics is a demonstration board based on the PM6675S step-down controller and embedded 2 A LDO regulator, supporting 4.5–28 V input, 1.5 V fixed or 0.6–3.3 V adjustable output, and constant-on-time control for fast transient response in power supply evaluation.

For engineers reviewing the STEVAL-ISA052V1 datasheet, STEVAL-ISA052V1 pinout, STEVAL-ISA052V1 application, or STEVAL-ISA052V1 equivalent, this board enables rapid validation of high-efficiency buck topology with integrated LDO, ceramic-capacitor compatibility, selectable pulse-skipping modes, and soft-start/soft-end sequencing for industrial and embedded power designs.

Technical Context

The board implements the PM6675S IC's constant-on-time (COT) control architecture, delivering fast load transient response without external compensation. It supports no-RSENSE current sensing via low-side MOSFET R_DS(on), negative current limiting, and latched OVP/UVP/thermal shutdown protection.

Two independent regulation paths are validated: a synchronous buck converter (1.5 V fixed or adjustable) and a 2 A sink/source LDO with active soft-end. Selectable 33 kHz low-noise pulse-skip mode and output ripple compensation ensure stable operation in audio-sensitive and low-EMI applications.

Key Specifications

Availability

STEVAL-ISA052V1 is available at Aetrix Electronics and suitable for industrial PLC power modules, embedded computing power trees, and automotive infotainment subsystems requiring stable component supply and rapid prototyping capability.

Supply support for STEVAL-ISA052V1 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, power ICs, sensors, and analog/mixed-signal devices for industrial, automotive, and consumer markets.

The STEVAL-ISA052V1 belongs to ST's STEVAL evaluation board family, developed specifically to accelerate design-in of high-efficiency, multi-rail DC-DC controllers with integrated LDOs for space-constrained and noise-sensitive applications.

FAQ

What is the primary function of the STEVAL-ISA052V1 demonstration board?

The STEVAL-ISA052V1 is a hardware platform that demonstrates the PM6675S dual-output power management IC, integrating a synchronous step-down controller and a 2 A bidirectional LDO. It validates real-world performance of constant-on-time regulation, ceramic-capacitor compatibility, and coordinated soft-start/soft-end sequencing under varying load and line conditions.

Does the board support adjustable output voltage, and how is it configured?

Yes - the main buck output is adjustable from 0.6 V to 3.3 V using an external resistor divider on the FB pin, while a 1.5 V fixed option is also implemented. The LDO output is fixed at 3.3 V per the schematic and cannot be adjusted. Configuration requires modifying R10/R11 values per the PM6675S datasheet equations.

Can the STEVAL-ISA052V1 be used for audio applications, and what feature enables this?

Yes - the board supports low-noise operation via a selectable pulse-skip mode that enforces a minimum 33 kHz switching frequency, avoiding audible band frequencies (20 Hz–20 kHz). This is enabled by jumper JP2 and reduces mechanical vibration and acoustic noise in audio amplifiers or microphone bias supplies.

How does the board handle overcurrent and fault conditions?

The board implements latched overvoltage (OVP), undervoltage (UVP), and thermal shutdown protection derived from the PM6675S. It also features negative current limiting on the LDO output and uses R_DS(on)-based current sensing on the buck path - faults trigger immediate shutdown with manual reset required via power cycle.