STMicroelectronics STEVAL-1PS02D

Overview

STEVAL-1PS02D from STMicroelectronics is an evaluation board built around the ST1PS02DQTR nano-quiescent synchronous step-down converter, delivering up to 400 mA at dynamically selectable 1.0–1.35 V output from a 1.8–5.5 V input. It integrates an auxiliary load switch (VOUT2), power-good signaling, and uses only a 2.2 µH inductor and two small capacitors for full operation - optimized for ultra-low-power wearable and sensor applications.

For engineers reviewing the STEVAL-1PS02D datasheet, STEVAL-1PS02D pinout, STEVAL-1PS02D application, or STEVAL-1PS02D equivalent, this board enables rapid validation of ST1PS02DQTR's dynamic voltage selection, sub-1-µA quiescent current performance, AUX-controlled subsystem powering, and compact 2.0×1.7 mm TQFN12 implementation in space-constrained battery-powered designs.

Technical Context

The board implements the ST1PS02DQTR IC in a complete, tested buck converter topology with integrated MOSFETs, enhanced peak current control (PCC), and digitally selectable output voltage via D0/D1/D2 pins. It supports true nano-quiescent operation (<1 µA shutdown, ~250 nA I_Q in regulation) and features a dedicated AUX-controlled load switch independent of the main regulator rail.

Power-good (PGOOD) status is actively monitored on the main output, while VIN_F/VIN_S and VOUT_F/VOUT_S test points enable separate measurement of front-end and switched-node waveforms. The board's layout preserves the IC's thermal and EMI performance in its minimal 2.0×1.7 mm TQFN12 footprint.

Key Specifications

Availability

STEVAL-1PS02D is available at Aetrix Electronics and suitable for wearable electronics development, BLE/Zigbee sensor node prototyping, and ultra-low-power industrial monitoring systems requiring stable component supply and fast time-to-test.

Supply support for STEVAL-1PS02D 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 designing and manufacturing microcontrollers, power management ICs, sensors, and analog devices for industrial, automotive, and consumer applications.

The STEVAL-1PS02D belongs to ST's high-efficiency nano-power evaluation platform family, engineered specifically to accelerate adoption of ultra-low-I_Q DC-DC converters in battery-constrained edge devices.

FAQ

What is the primary function of the STEVAL-1PS02D evaluation board?

The STEVAL-1PS02D is a fully assembled, tested evaluation board for the ST1PS02DQTR synchronous step-down converter. Its purpose is to demonstrate and validate the IC's nano-quiescent operation, dynamic output voltage selection (1.0–1.35 V), integrated AUX load switch, and power-good signaling in real-world low-power applications using minimal external components.

Can the output voltage be adjusted during operation?

Yes - the output voltage is digitally adjustable in 50 mV steps from 1.0 V to 1.35 V via three logic inputs (D0, D1, D2) on the ST1PS02DQTR. These pins are accessible on CN1 header, allowing firmware or external logic to reconfigure VOUT dynamically without hardware modification.

Does the board include test points for critical signals?

Yes - the board provides dedicated test points for VIN_F (input), VOUT_F (main output), VOUT_S (switch node), GND_F/GND_S (separate ground returns), and VOUT2_F/VOUT2_S (AUX switch output). These facilitate accurate oscilloscope measurements of efficiency, ripple, transient response, and switching behavior.

Is the STEVAL-1PS02D RoHS and WEEE compliant?

Yes - the STEVAL-1PS02D hardware complies with both RoHS Directive 2011/65/EU and WEEE Directive 2012/19/EU. Compliance applies to the PCB assembly and all onboard components; documentation (DB4285) confirms this status as of Rev 1 (May 2021).