STMicroelectronics STEVAL-1PS01EJR

Overview

STEVAL-1PS01EJR from STMicroelectronics is an evaluation board for the ST1PS01EJR 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, digitally selectable 1.8 V–3.3 V output, Power Good signaling, and achieves 94% efficiency at 1 mA with only a 2.2 µH inductor.

For engineers reviewing the STEVAL-1PS01EJR datasheet, STEVAL-1PS01EJR pinout, STEVAL-1PS01EJR application, or STEVAL-1PS01EJR equivalent, this board enables rapid validation of dynamic voltage scaling, low-I_Q DC/DC operation, and compact power delivery in single-cell Li-ion and Bluetooth® Low Energy endpoints.

Technical Context

The board implements the ST1PS01EJR IC in a fully assembled, tested configuration with dual digital control inputs (D0/D1) for real-time output voltage selection across four preset levels (1.8 V, 2.5 V, 2.8 V, 3.3 V). It integrates all critical passive components-including a 2.2 µH power inductor, input/output ceramic capacitors, and feedback resistors-optimized for minimal PCB area and height.

Power management architecture includes enhanced peak current control (PCC), UVLO with hysteresis, soft-start, output discharge, and a dedicated PGOOD open-drain signal synchronized to output regulation. The design targets sub-1 µA quiescent current in shutdown and <1.5 µA I_Q in light-load PWM mode.

Key Specifications

Availability

STEVAL-1PS01EJR is available at Aetrix Electronics and suitable for wearable electronics development, Bluetooth® Low Energy sensor nodes, and industrial wireless monitoring systems requiring stable component supply and fast prototyping turnaround.

Supply support for STEVAL-1PS01EJR 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, Switzerland, delivering intelligent power, analog, MEMS, and microcontroller solutions for industrial, automotive, and consumer applications.

This evaluation board belongs to ST's Power Management Evaluation Kits product line, engineered to accelerate adoption of ultra-low-power DC/DC converters in space-constrained, battery-operated edge devices.

FAQ

What is the primary function of the STEVAL-1PS01EJR evaluation board?

The STEVAL-1PS01EJR is a fully assembled hardware platform for evaluating the ST1PS01EJR synchronous buck converter. It demonstrates dynamic voltage selection, ultra-low quiescent current operation, and high-efficiency power conversion using minimal external components-enabling immediate testing without layout or component sourcing.

Does the board support automatic voltage scaling during runtime?

Yes. The board exposes D0 and D1 digital control inputs that allow host MCU GPIOs to change output voltage between 1.8 V, 2.5 V, 2.8 V, and 3.3 V in real time, enabling adaptive power management for varying processing loads or peripheral activation states.

Can the STEVAL-1PS01EJR be used with energy harvesting sources?

Yes. Its 1.8 V minimum input voltage, sub-1.5 µA quiescent current in light-load mode, and ability to start up from weak sources make it compatible with output from solar cells, thermal harvesters, or piezoelectric generators when paired with appropriate storage capacitance.

Is the PGOOD signal electrically compatible with standard logic interfaces?

Yes. PGOOD is an open-drain output referenced to GND, pulled high externally via a 10 kΩ resistor on the board. It operates over the full input range (1.8–5.5 V) and asserts low within 100 µs of output regulation-compatible with 1.8 V, 3.3 V, and 5 V logic families without level shifting.