STMicroelectronics STEVAL-ISA141V1

Overview

STEVAL-ISA141V1 from STMicroelectronics is an evaluation board built around the STBB3J fixed-frequency, high-efficiency buck-boost DC-DC converter IC, supporting 1.2 V to 5.5 V adjustable output, 2 A buck-mode / 800 mA boost-mode output at 3.3 V, and automatic mode transition-designed for lithium-ion battery-powered systems where input voltage crosses the regulated output.

For engineers reviewing the STEVAL-ISA141V1 datasheet, STEVAL-ISA141V1 pinout, STEVAL-ISA141V1 application, or STEVAL-ISA141V1 equivalent, key selection factors include dual-mode operation under varying VIN, 2.0 MHz fixed switching frequency with optional external sync up to 2.4 MHz, ±2% FB voltage tolerance, power-save mode at light load, and shutdown current <1 µA.

Technical Context

The STEVAL-ISA141V1 implements the STBB3J controller in a fully assembled, tested reference layout optimized for low-noise, high-efficiency dual-mode conversion. It supports seamless transition between buck and boost topologies without external control logic, using internal mode detection based on VIN–VOUT differential and MODE pin configuration.

It integrates synchronous rectification, internal compensation, soft-start timing (2 ms), and load disconnect during shutdown. The board uses a 2.2 µH shielded inductor (L1), ceramic input/output capacitors (C1–C9), and precision feedback resistors (R1/R2) to achieve >94% typical efficiency across 1.8–5.5 V input range.

Key Specifications

Availability

STEVAL-ISA141V1 is available at Aetrix Electronics and suitable for building safety and security systems, residential HVAC controllers, smart city sensor nodes, and industrial tool power management requiring stable component supply and validated reference design implementation.

Supply support for STEVAL-ISA141V1 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 delivering intelligent power, analog, MEMS, and microcontroller solutions for industrial, automotive, and consumer applications.

The STEVAL-ISA141V1 belongs to ST's power management evaluation board portfolio, designed to accelerate adoption of its high-efficiency buck-boost converters in battery-critical embedded systems.

FAQ

What is the primary function of the STEVAL-ISA141V1 evaluation board?

The STEVAL-ISA141V1 is a fully assembled evaluation platform for the STBB3J buck-boost DC-DC converter IC. Its purpose is to demonstrate and validate dual-mode (buck/boost) power conversion with automatic mode transition, adjustable output (1.2–5.5 V), and high efficiency (>94%) across wide input ranges-enabling rapid prototyping of battery-powered systems.

Does the board support external synchronization of the switching frequency?

Yes. The STEVAL-ISA141V1 exposes the MODE/SYNC pin of the STBB3J IC, allowing users to override the default 2.0 MHz fixed frequency with an external square-wave signal up to 2.4 MHz. This feature supports EMI reduction and timing alignment with other system clocks.

How is load disconnect implemented during shutdown?

During shutdown, the STBB3J IC disables both high-side and low-side power switches and actively isolates the output from the input via internal MOSFET control. On the STEVAL-ISA141V1, this is verified by measuring open-circuit VOUT with VIN applied and EN pulled low-confirming no backfeed or leakage path to downstream circuitry.

Can the output voltage be adjusted, and how is it set on this board?

Yes. The output voltage is set by the R1/R2 feedback divider network connected to the FB pin. On STEVAL-ISA141V1, R1 = 100 kΩ and R2 = 100 kΩ, yielding VOUT = 0.6 V × (1 + R1/R2) = 1.2 V. Users can replace R2 with a different value to scale output linearly within 1.2–5.5 V per the STBB3J datasheet equation.