STMicroelectronics STEVAL-ISA082V1

Overview

STEVAL-ISA082V1 from STMicroelectronics is an evaluation board for the ST1S40IPHR synchronous step-down DC-DC converter, configured for 3.3 V/3 A output at 800 kHz fixed switching frequency with 4–18 V input range and enable-controlled on/off operation. It implements peak current mode control with internal compensation and integrates short-circuit protection with foldback.

For engineers reviewing the STEVAL-ISA082V1 datasheet, STEVAL-ISA082V1 pinout, STEVAL-ISA082V1 application, or STEVAL-ISA082V1 equivalent, this board enables rapid validation of ST1S40IPHR-based power supply designs in industrial sensors, portable instrumentation, and embedded microcontroller power rails requiring compact, high-efficiency 3.3 V regulation.

Technical Context

The board implements a fixed-frequency (800 kHz), internally compensated PWM synchronous buck topology using the ST1S40IPHR IC, which integrates a 95 mΩ high-side MOSFET and 69 mΩ synchronous rectifier. Input voltage support spans 4 V to 18 V, and output is regulated to 3.3 V via resistor divider feedback (FB pin).

Protection includes cycle-by-cycle overcurrent limiting and short-circuit foldback with frequency reduction. The EN/PG pin provides both enable control and power-good indication, supporting system-level sequencing and fault reporting in real-time power management applications.

Key Specifications

Availability

STEVAL-ISA082V1 is available at Aetrix Electronics and suitable for industrial sensor nodes, portable test equipment, and FPGA I/O bank power supplies requiring stable component supply and fast design validation cycles.

Supply support for STEVAL-ISA082V1 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 management ICs, sensors, and analog devices for industrial, automotive, and consumer markets.

The STEVAL-ISA082V1 belongs to ST's STEVAL evaluation board family, engineered to accelerate adoption of ST's integrated power converters by providing fully tested, documented reference designs with validated layouts and performance data.

FAQ

What input voltage range does the STEVAL-ISA082V1 support?

The board accepts 4 V to 18 V DC input, matching the operating range of the ST1S40IPHR controller. This allows direct connection to common industrial 12 V rails or battery-backed 5–15 V sources without external regulators, simplifying front-end power architecture in space-constrained designs.

Can the output voltage be adjusted, and how?

Yes - the output is set to 3.3 V by default using R1/R2 feedback resistors per the schematic. To adjust VOUT, replace R1 and/or R2 to satisfy VOUT = 0.8 V × (1 + R1/R2); the ST1S40IPHR's FB pin references 0.8 V, enabling outputs from 0.8 V up to VIN (100% duty cycle).

Does the board provide power-good signaling?

Yes - the EN/PG pin serves dual function: active-high enable input and open-drain power-good output. When VOUT is within regulation (±10%), PG asserts low; otherwise it remains high-impedance. This enables safe system startup sequencing and fault detection in host controllers.

Is external compensation required for stability?

No - the ST1S40IPHR uses internal compensation optimized for the onboard 3.3 µH inductor and 22 µF output capacitor. No external compensation components are needed, eliminating tuning effort and ensuring robust loop stability across temperature and load conditions.