STMicroelectronics STEVAL-1PS02A

Overview

STEVAL-1PS02A from STMicroelectronics is an evaluation board built around the ST1PS02AQTR 400 mA nano-quiescent synchronous step-down converter, supporting 1.8–5.5 V input and dynamically selectable 1.4–1.75 V output with Power Good signaling and auxiliary load switch (VOUT2). It demonstrates ultra-low-power DC/DC conversion in wearable and energy-harvesting systems using only a 2.2 µH inductor and two small capacitors.

For engineers reviewing the STEVAL-1PS02A datasheet, STEVAL-1PS02A pinout, STEVAL-1PS02A application, or STEVAL-1PS02A equivalent, this board enables rapid validation of ST1PS02AQTR's dynamic voltage selection, sub-1 µA quiescent current operation, AUX-controlled subsystem powering, and compact 2.0×1.7 mm TQFN12 implementation in space-constrained battery-powered designs.

Technical Context

The board implements a complete buck converter reference design centered on the ST1PS02AQTR IC, which uses enhanced peak current control (PCC) to maintain regulation across wide input/output ratios while minimizing no-load IQ. Its digital voltage selection interface (D0–D2 pins) enables real-time adjustment of the main output between 1.4 V and 1.75 V in 50 mV steps.

Integrated auxiliary load switch (VOUT2) is independently controlled via AUX pin, allowing synchronized or decoupled power delivery to secondary subsystems. Power Good (PGOOD) provides open-drain status indication of main output regulation, critical for system sequencing in ultra-low-power wake-up architectures.

Key Specifications

Availability

STEVAL-1PS02A is available at Aetrix Electronics and suitable for wearable electronics development, Bluetooth® Low Energy sensor node prototyping, and industrial IoT edge device validation requiring stable component supply and fast-turn evaluation support.

Supply support for STEVAL-1PS02A 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, sensing, connectivity, and microcontroller solutions for automotive, industrial, and consumer applications.

This board belongs to ST's Power Management Evaluation Kit product line, designed to accelerate adoption of ultra-low-IQ DC/DC converters in battery-operated and energy-constrained systems.

FAQ

What is the primary function of the STEVAL-1PS02A evaluation board?

The STEVAL-1PS02A is a fully assembled and tested evaluation platform for the ST1PS02AQTR synchronous step-down converter. It enables engineers to validate dynamic voltage scaling, ultra-low quiescent current performance, AUX-switched subsystem powering, and compact layout feasibility-without designing custom PCBs or selecting external components.

Does the board support adjustable output voltage during operation?

Yes. The board implements the ST1PS02AQTR's 3-bit digital interface (D0–D2), allowing real-time selection of eight discrete output voltages between 1.4 V and 1.75 V in 50 mV increments. Voltage changes take effect within microseconds and do not require reconfiguration of external components.

Can the auxiliary load switch (VOUT2) be used independently of the main output?

Yes. The AUX pin controls the VOUT2 switch independently of the main converter's EN pin. This allows VOUT2 to remain active while the main output is disabled (e.g., during deep-sleep MCU states), enabling selective peripheral power retention without compromising overall system IQ.

What package does the ST1PS02AQTR use on this board?

The ST1PS02AQTR on the STEVAL-1PS02A is mounted in its standard TQFN12 (2.0 × 1.7 mm, 0.5 mm pitch) thin quad flat no-lead package. This package supports high thermal efficiency and minimal PCB area usage-critical for thin-profile wearables and compact sensor modules.