BQ24179YBGR

bq24179 Buck-Boost Battery ChargerTexas Instruments bq24179 Buck-Boost Battery Charger is a fully integrated switch-mode buck-boost charger for 1- to 4-cell Li-ion batteries and Li-polymer batteries. The integration includes four switching MOSFETs (Q1, Q2, Q3, Q4), input and charging current sensing circuits, the battery FET (QBAT), and all the loop compensation of the buck-boost converter. It uses narrow VDC power path management, regulating the system slightly above the battery voltage without dropping below a configurable minimum system voltage. When system power exceeds the input source rating, battery supplement mode supports the system without overloading the input source. The charger supports the NVDC power path management, in which the system is regulated at a voltage slightly higher than the battery voltage but does not drop below the minimum system voltage. The system keeps operating even when the battery is completely discharged or removed. When load power exceeds input source rating, the battery gets into supplement mode and prevents the input source from being overloaded and the system from crashing.