Charger cuts leakage current to 3μA for eCall

Article By : Intersil

The chip’s battery temperature monitoring and 3.6V output voltage helps safeguard and extend the life of LiFePO4 batteries used in eCall systems.

With the essential role an emergency call (eCall) provides, car makers want a charger that prevents rapid discharge of the backup battery during a traffic accident or when the vehicle is parked for a long time. Intersil’s 3.6V single-cell charger extends the life of LiFePO4 batteries used in eCall systems. The ISL78693 battery charger offers up to 4x lower leakage current (3μA) allowing the eCall backup battery to remain charged for longer time.

The ISL78693 charger supports emerging worldwide eCall systems such as Japan's D-Call Net trial, Europe's eCall initiative, as well as both ERA-GLONASS in Russia and OnStar in the United States.

The ISL78693's battery temperature monitoring and 3.6V output voltage helps safeguard and extend the life of popular LiFePO4 batteries. The ISL78693 also requires only five external passive components to program the full charging platform. The charger’s 3mm x 3mm DFN package fits on space-constrained PCBs. It also offers charge current thermal foldback that prevents overheating by automatically reducing the battery charging current.

The 3.6V ISL78693 is pin-compatible with the 4.1V ISL78692 Li-ion battery charger. Either charger can be combined with the ISL78268 55V synchronous buck controller, ISL78201 2.5A synchronous buck/boost regulator, ISL78206 2.5A synchronous buck regulator and ISL78233 3A synchronous buck regulator to provide a full power supply from 12V lead acid battery to eCall battery.