STMicroelectronics STEVAL-ISA048V2

Overview

STEVAL-ISA048V2 from STMicroelectronics is a demonstration board for the ST8R00W 1 A synchronous step-up DC-DC converter, designed to evaluate adjustable 6–12 V PWM boost operation from 4–6 V input. It delivers up to 1 A output current with ±2% voltage accuracy, 5 mV typical ripple, and 90% peak efficiency at 9 V output.

For engineers reviewing the STEVAL-ISA048V2 datasheet, STEVAL-ISA048V2 pinout, STEVAL-ISA048V2 application, or STEVAL-ISA048V2 equivalent, this board enables rapid validation of high-frequency (1.2 MHz) synchronous boost topology, low-quiescent-current (500 µA) power conversion, and minimal-component design using ceramic capacitors and surface-mount inductors.

Technical Context

The board implements the ST8R00W IC in continuous conduction mode (CCM), ensuring stable low-ripple operation even at light loads. Its current-mode PWM control architecture provides inherent loop stability and fast transient response across the full 6–12 V adjustable output range.

Operating at 1.2 MHz switching frequency, the design minimizes external passive size-requiring only one inductor, two ceramic capacitors, and a resistor divider-while maintaining high efficiency (90% typ. at VO = 9 V) and tight output regulation (±2%) over temperature and line variations.

Key Specifications

Availability

STEVAL-ISA048V2 is available at Aetrix Electronics and suitable for portable medical monitors, handheld test equipment, and battery-powered industrial sensors requiring stable component supply and fast evaluation of synchronous boost converters.

Supply support for STEVAL-ISA048V2 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, delivering microcontrollers, power ICs, sensors, and analog solutions for industrial, automotive, and consumer applications.

The STEVAL-ISA048V2 belongs to ST's ST8R00W evaluation platform family, engineered specifically to accelerate development of compact, high-efficiency boost supplies for battery-powered systems operating below 6 V input.

FAQ

What input voltage range does the STEVAL-ISA048V2 support?

The board accepts 4 V to 6 V DC input, optimized for single-cell lithium-ion (3.0–4.2 V nominal, up to 4.35 V max) or dual-cell alkaline/NiMH sources. Input under-voltage lockout prevents operation below 4 V, and internal protection limits maximum input to 6 V per ST8R00W specifications.

How is output voltage adjusted on this board?

Output voltage is set using an external resistor divider (R1/R2) connected to the FB pin of the ST8R00W. The default configuration yields 9 V, but scaling R1 or R2 allows precise adjustment from 6 V to 12 V per the formula VO = 0.6 V × (1 + R1/R2), where 0.6 V is the internal reference voltage.

Does the board include thermal protection or current limiting?

Yes-the underlying ST8R00W IC integrates cycle-by-cycle current limiting and thermal shutdown. The demonstration board preserves these functions: overcurrent triggers foldback current limiting, and die temperature exceeding 150 °C disables switching until cooldown. No external components are required to activate these protections.

Can the STEVAL-ISA048V2 be used for continuous 1 A output operation?

Yes, when mounted on a standard FR-4 PCB with ≥2 oz copper and adequate airflow, the board sustains 1 A continuous output at 9 V with junction temperature below 105 °C. At higher ambient temperatures or without heatsinking, derating to 800 mA is recommended to maintain reliability and regulation accuracy.