TIBQ25570
Overview
The BQ25570 is a highly integrated energy harvesting management solution designed to extract microwatts to milliwatts from high-impedance sources like solar, thermal, or piezo-electric generators. It combines an ultra-low-power boost charger with a nanopower buck converter to provide a regulated output voltage while maintaining a typical quiescent current of only 488 nA. The device includes a programmable Maximum Power Point Tracking (MPPT) sampling network to optimize energy extraction from various harvesters.
Why Choose This Part
The BQ25570 stands out for its cold-start capability from inputs as low as 600 mV and its ability to continue harvesting down to 100 mV once operational. By integrating both the boost charger and a programmable buck regulator into a single 3.5x3.5mm VQFN package, it significantly reduces PCB footprint and standby power losses compared to discrete solutions. Additionally, the built-in battery protection and Battery Good indicator simplify the interface with host microcontrollers for power-fail warnings.
Applications
Key Specifications
Getting Started
For initial evaluation, the BQ25570EVM-206 evaluation module provides a complete reference circuit with jumpers to configure voltage thresholds and MPPT settings. Designers should carefully select the inductor and storage capacitor values based on the expected input power levels and peak load requirements of the system. Detailed guidance on setting the MPPT ratio for different source types is available in the Texas Instruments technical documentation.
