STMicroelectronics STEVAL-ISA200V1

Overview

STEVAL-ISA200V1 from STMicroelectronics is an evaluation board based on the A6984 monolithic synchronous step-down regulator, delivering up to 400 mA DC output current with 4.5 V–36 V input range, fixed 3.3 V output (no resistor divider required), and selectable low-consumption or low-noise operating modes for automotive power systems.

For engineers reviewing the STEVAL-ISA200V1 datasheet, STEVAL-ISA200V1 pinout, STEVAL-ISA200V1 application, or STEVAL-ISA200V1 equivalent, this board enables rapid validation of A6984's constant-on-time control, PGOOD sequencing, VBIAS efficiency optimization, and 250–600 kHz adjustable switching frequency in 12 V automotive rail conversion.

Technical Context

The board implements the A6984 IC in a fixed 3.3 V output configuration using constant-on-time (COT) control, enabling fast transient response without external compensation. It supports dual operating modes: low-consumption mode (LCM) with 100 µA quiescent current at light load and low-noise mode (LNM) with near-constant switching frequency across load range.

Pulse-by-pulse valley current sensing provides 350 mA current limit protection. The PGOOD open-collector signal enables precise power-up sequencing, while VBIAS connection improves light-load efficiency by powering internal circuitry from the output rail.

Key Specifications

Availability

STEVAL-ISA200V1 is available at Aetrix Electronics and suitable for automotive power validation, infotainment subsystem prototyping, and sensor module reference design requiring stable component supply and AEC-Q100-aligned evaluation platforms.

Supply support for STEVAL-ISA200V1 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, analog chips, and automotive-grade solutions.

The STEVAL-ISA200V1 belongs to ST's ST EVAL series of application-specific evaluation boards, developed to accelerate design-in of A6984 regulators in automotive power systems with validated thermal, EMI, and sequencing behavior.

FAQ

What is the primary function of the STEVAL-ISA200V1 evaluation board?

The STEVAL-ISA200V1 is a fully assembled and tested evaluation platform for the A6984 synchronous buck regulator. It demonstrates fixed 3.3 V output operation, validates LCM/LNM mode switching, verifies PGOOD sequencing capability, and provides accessible test points for measuring VIN, VOUT, EN, PGOOD, and VBIAS under real load conditions.

Does STEVAL-ISA200V1 support adjustable output voltage?

No - STEVAL-ISA200V1 is configured for fixed 3.3 V output only, achieved via internal feedback routing that eliminates the external resistor divider. Output voltage adjustment requires modifying the A6984's FB network on a custom PCB; this board does not include trim components or jumpers for VOUT tuning.

How is thermal performance validated on this board?

The board uses the A6984 in a thermally optimized layout with EP (exposed pad) soldered to PCB copper pour, verified per ST's layout guidelines. Thermal shutdown is active and triggers below 150 °C junction temperature. Measured thermal resistance θJA is 42 °C/W under natural convection, enabling 400 mA continuous operation at ambient ≤70 °C.

Can STEVAL-ISA200V1 be used for EMI testing?

Yes - the board incorporates layout best practices for EMI suppression: symmetric power loops, minimized high-di/dt node area, integrated input/output ceramic capacitors (C1, C6, C7), and shielded inductor L1 (LPS6225-683MLC). Conducted EMI measurements comply with CISPR 25 Class 5 limits when paired with recommended input filter components.