STMicroelectronics STEVAL-1PS01AJR

Overview

STEVAL-1PS01AJR from STMicroelectronics is an evaluation board based on the ST1PS01AJR 400 mA nano-quiescent synchronous step-down converter, designed for ultra-low-power wearable and energy-harvesting systems. It supports 1.8 V–5.5 V input, delivers dynamically selectable 1.9 V–2.8 V output, includes Power Good signaling, and uses only a 2.2 µH inductor and two small capacitors.

For engineers reviewing the STEVAL-1PS01AJR datasheet, STEVAL-1PS01AJR pinout, STEVAL-1PS01AJR application, or STEVAL-1PS01AJR equivalent, this board enables rapid validation of ST1PS01AJR's dynamic voltage selection (D0/D1), sub-1 µA quiescent current behavior, and high-efficiency operation under single-cell Li-ion and energy-harvesting source constraints.

Technical Context

The board implements the ST1PS01AJR IC in a fully assembled, tested configuration with accessible test points (TP1, TP2), jumpers (JP1), and dual-header interfaces (CN1–CN6) for system integration. All critical power paths - VIN_F/VIN_S, VOUT_F/VOUT_S, GND_F/GND_S - are segregated for noise-sensitive low-power measurement.

It leverages enhanced peak current control (PCC) architecture to achieve >90% efficiency at 100 µA load while maintaining <500 nA shutdown current. The D0/D1 digital inputs directly map to four discrete output voltages (1.9 V, 2.2 V, 2.5 V, 2.8 V), and PGOOD asserts when VOUT is within ±4% of target.

Key Specifications

Availability

STEVAL-1PS01AJR is available at Aetrix Electronics and suitable for wearable electronics development, Bluetooth® Low Energy node prototyping, and industrial sensor node design requiring stable component supply and fast time-to-test.

Supply support for STEVAL-1PS01AJR 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, delivering microcontrollers, power management ICs, sensors, and analog solutions for industrial, automotive, and consumer markets.

The STEVAL-1PS01AJR belongs to ST's ultra-low-power DC-DC evaluation platform family, engineered specifically to accelerate adoption of nano-quiescent buck converters in battery-constrained edge devices.

FAQ

What is the purpose of the dual ground (GND_F/GND_S) and dual voltage (VIN_F/VIN_S, VOUT_F/VOUT_S) routing on STEVAL-1PS01AJR?

This separation isolates noisy digital switching paths (GND_F/VIN_F/VOUT_F) from sensitive analog/sensor domains (GND_S/VIN_S/VOUT_S). It minimizes coupling in mixed-signal applications like fitness monitors where ADCs or RF transceivers share the same PCB as the regulator.

Can STEVAL-1PS01AJR be used to evaluate ST1PS01AJR in energy harvesting applications?

Yes - its 1.8 V minimum input and sub-1 µA quiescent current allow direct interface with low-output-energy harvesters (e.g., solar cells, thermal generators). The board's minimal external component count reduces startup voltage requirements and leakage paths critical for microwatt-scale systems.

How do the D0 and D1 pins control output voltage on STEVAL-1PS01AJR?

D0 and D1 are TTL/CMOS-compatible digital inputs that select one of four fixed output voltages: 00 = 1.9 V, 01 = 2.2 V, 10 = 2.5 V, 11 = 2.8 V. These pins are routed to CN2 pins 1–2 and accessible via JP1 for static configuration or MCU GPIO control during runtime.

Is the STEVAL-1PS01AJR RoHS-compliant and suitable for commercial wearable product development?

Yes - the board meets RoHS Directive 2011/65/EU and WEEE compliance (hardware only). Its layout follows ST's recommended footprint and thermal design for ST1PS01AJR, making it suitable for pre-compliance functional validation in certified wearable designs targeting CE/FCC certification.