Key Design Considerations for the bq27500 and bq27501

This application report provides the basic operating theory and key design considerations for the bq27500 and bq27501 single-cell, Li-ion fuel gauge ICs with the Impedance Track™ algorithm. The bq27500/501 ICs are designed to reside on the system's main board in applications with an embedded or removable battery pack. To achieve best results, the fuel gauge ICs must work properly with the battery charge circuit and the system power sequencing methodology. The application report reviews the basics on fuel gauge system integration including system design, thermistor support, sense-resistor selection, and layout considerations.