TIBQ25570RGRT
Overview
The BQ25570RGRT is a highly integrated energy harvesting management solution designed to extract microwatts to milliwatts from high-impedance sources like solar or thermoelectric generators. It combines an ultra-low-power boost charger with a nanopower buck converter to provide a regulated output voltage for low-power microcontrollers and sensors. With a typical operating quiescent current of only 488 nA, it maximizes the utility of harvested energy in systems where every nanojoule counts.
Why Choose This Part
The device features a cold-start voltage of 600 mV, but once running, it can continue harvesting energy from input voltages as low as 100 mV. It includes programmable Maximum Power Point Tracking (MPPT) to optimize energy extraction and provides a battery-good output flag to coordinate system startup with external MCUs. The integrated buck converter delivers up to 110 mA of peak current, supporting the high-power bursts required during wireless transmissions.
Applications
Key Specifications
Getting Started
Evaluation is best performed using the BQ25570EVM-206 evaluation module, which allows for quick configuration of the MPPT set point and output voltages via external resistors. Designers should pay close attention to the selection of the low-ESR storage capacitor and the inductor to maintain high efficiency at low power levels. Refer to the Texas Instruments application notes for calculating resistor dividers to set the over-voltage and under-voltage protection levels for specific battery chemistries.
