STMicroelectronics STEVAL-ISA048V1

Overview

STEVAL-ISA048V1 from STMicroelectronics is an evaluation board for the ST8R00 synchronous step-up DC-DC converter, designed to demonstrate 6–12 V output generation from a 4–6 V input with up to 1 A load current, ±2% output voltage accuracy, and 90% peak efficiency at 9 V output. It implements the DFN8 (4 × 4 mm) ST8R00WPUR in a validated reference layout using a 4.7 µH inductor and two 10 µF ceramic capacitors.

For engineers reviewing the STEVAL-ISA048V1 datasheet, STEVAL-ISA048V1 pinout, STEVAL-ISA048V1 application, or STEVAL-ISA048V1 equivalent, this board enables rapid validation of ST8R00-based boost converter designs in portable instrumentation, industrial sensors, and low-voltage battery-powered systems requiring stable 7–10 V rails from single-cell Li-ion or dual-cell alkaline sources.

Technical Context

The STEVAL-ISA048V1 implements the ST8R00's current-mode PWM control architecture operating at 1.2 MHz typical switching frequency, supporting fast transient response (±5% load regulation, ±5% line regulation) and low 5 mV_RMS output ripple via optimized PCB layout and low-ESR ceramic output capacitance. Its feedback network uses external resistors to set output voltage precisely within the 6–12 V range.

Thermal management relies on the ST8R00's internal thermal shutdown (130–150 °C trip) and the board's exposed pad soldered to a copper pour, achieving R_thJA ≈ 50 °C/W. Inhibit control is implemented via a logic-level enable signal (0.8 V low / 2 V high threshold) routed to a test point and jumper option.

Key Specifications

Availability

STEVAL-ISA048V1 is available at Aetrix Electronics and suitable for portable medical monitors, handheld test equipment, industrial sensor nodes, and battery-backed RTU modules requiring stable component supply and rapid power stage prototyping.

Supply support for STEVAL-ISA048V1 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, designing and manufacturing analog, MCU, power, and sensing solutions for industrial, automotive, and consumer markets.

The STEVAL-ISA048V1 belongs to ST's ST8R00 evaluation platform series, developed specifically to accelerate adoption of micropower synchronous boost converters in space-constrained, battery-sensitive applications where input voltage droop and output stability are critical.

FAQ

What input voltage sources are compatible with STEVAL-ISA048V1?

The board accepts 4–6 V DC input, making it compatible with regulated 5 V supplies, USB power banks, and batteries including single-cell Li-ion (fully charged at 4.2 V), LiFePO₄ (3.6 V nominal), or two-series alkaline/NiMH (2.4–3.2 V) when paired with a low-drop pre-regulator. Input must remain ≥4 V to ensure start-up and regulation across temperature.

Can STEVAL-ISA048V1 be used to evaluate different output voltages?

Yes - the output voltage is set by an external resistor divider (R1/R2) on the FB pin. The board includes solder jumpers and footprint pads allowing direct replacement of R1/R2 to configure outputs from 6 V to 12 V. Reference values for 7 V, 9 V, and 12 V are documented in the user manual (UM1192).

Does STEVAL-ISA048V1 support enable/disable sequencing with host microcontrollers?

Yes - the INH (inhibit) pin is brought out to a 0.1″ header and configurable via jumper JP1. Driving INH ≥2 V enables the ST8R00; pulling it ≤0.8 V disables switching and reduces quiescent current to <1 µA. This allows clean power sequencing with MCUs or battery fuel gauges without external logic.

What thermal performance can be expected during 1 A continuous operation?

At 25 °C ambient and 9 V/1 A output, the ST8R00 junction temperature rises ~45 °C above ambient (based on R_thJA = 50 °C/W and ~0.5 W dissipation), staying well below the 125 °C max operating junction temperature. Board-level copper pour under the DFN8 exposed pad is essential; derating to 800 mA is recommended above 60 °C ambient.