Li-Ion Battery Charger with Three-Parameter Regulation Loop

This article presents an implementation of triple control loop regulation topology in a Li-ion battery charging integrated circuit. The circuit performs constant-current, constant-voltage and constant-temperature charge current regulation. Sequential regulation loops are built using an operational amplifier with multiple inputs that performs analog minority function on three input control signals. It offers ultra low power consumption, high accuracy and is area efficient. Theoretical analysis of the regulation loops for three operation modes is discussed and circuit simulation results are presented. Measured waveforms illustrate circuit functionality and match simulation results