TIBQ25505RGRT
Overview
The BQ25505RGRT is an ultra-low-power energy harvesting management IC designed to extract microwatts to milliwatts from high-impedance sources like solar cells or thermoelectric generators. It features a highly efficient boost charger and an integrated power management system that can autonomously switch between a primary non-rechargeable battery and a secondary rechargeable storage element. With a cold-start voltage of 600 mV and the ability to continue harvesting down to 100 mV, it is optimized for systems that spend long periods in sleep mode.
Why Choose This Part
The device stands out for its extremely low quiescent current of 325 nA and its integrated Maximum Power Point Tracking (MPPT) logic which optimizes energy extraction. Its unique ability to manage two separate energy sources with an autonomous multiplexer ensures system reliability even when harvested energy is unavailable. The compact 3.5x3.5mm VQFN package includes battery protection features such as programmable overvoltage and undervoltage thresholds.
Applications
Key Specifications
Getting Started
Start development with the BQ25505EVM evaluation module to test harvesting efficiency and MPPT settings. Designers should prioritize low-ESR capacitors for the VSTOR and VBAT rails and use high-impedance probes when measuring the ultra-low quiescent currents. Configuration of the MPPT ratio and battery protection levels is handled through external resistor dividers on the VOC_SAMP and threshold pins.
