BQ25570 Nano Power Energy Harvester Module with Integrated Buck-Boost – Ultra Low Power MPPT for Solar & TEG

Overview

The BQ25570 Module is an ultra-low-power energy harvesting solution designed for applications where traditional power sources are unavailable or impractical. It extracts microwatts ($µW$) to milliwatts ($mW$) from high-impedance sources like small indoor solar panels or Thermoelectric Generators (TEGs).

Unlike simpler harvesters, the BQ25570 includes a highly efficient Buck-Boost converter that provides a regulated output voltage while simultaneously managing the charging of Li-ion batteries, Thin-film batteries, or Supercapacitors. With a quiescent current of less than 500nA, it is designed to keep your project alive on nearly zero energy.

Key Features

• Ultra-Low Quiescent Current: Consumes less than 500nA to maintain operation, ensuring harvested energy isn’t wasted.

• Cold Start Logic: Can begin harvesting from an input as low as 330mV—even if the storage element is completely dead.

• Integrated MPPT: Built-in Maximum Power Point Tracking (MPPT) ensures you extract the maximum possible energy from your solar or thermal source.

• Regulated Buck-Boost Output: Provides a stable voltage output (user-adjustable) to power your MCU (like an ESP32 or Pico) directly.

• Battery Protection: Includes programmable over-voltage and under-voltage protection to ensure your Li-ion or Supercapacitor doesn’t degrade.

Technical Specifications