Battery charging IC configured for automotive eCall systems
The IC is a 3.6V single-cell battery charger that extends the life of lithium iron phosphate (LiFePO4) batteries used in automotive emergency call (eCall) systems. The ISL78693 battery charger has up to 4x lower leakage current (3 µA) than comparable chargers, allowing the eCall backup battery to remain charged for a longer period of time.
The ISL78693 battery charger is designed to support emerging worldwide eCall systems such as Japan’s D-Call Net trial. Europe’s eCall initiative also brings immediate assistance to motorists involved in a collision, and both ERA-GLONASS in Russia and OnStar in the United States provide safety and ambulance call services.
The ISL78693’s battery temperature monitoring and 3.6V output voltage helps safeguard and extend the life of popular LiFePO4 batteries, with a simple-to-use design that uses five external passive components to program the full charging platform. Its 3 x 3 mm DFN package offers a very robust, small footprint design. It also offers a unique charge current thermal foldback feature that prevents overheating by automatically reducing the battery charging current to enhance reliability.
The ISL78693 battery charger in a 10-pin, 3 x 3 mm DFN package is priced at $0.99 (1000). An ISL78693EVAL1Z evaluation board is $56.
next page; feature listing
Features and Specifications:
• Complete charger for single-cell Lithium chemistry batteries
• Reverse battery leakage of 700 nA (typ) and 3 µA (max) over -40°C to +85°C increases duration the backup battery remains charged when Vin supply is off
• Up to 1A programmable charging current, allows trade-off of battery charging time against heat dissipation and expected battery lifetime
• Guaranteed operation down to 2.65V after start-up, preventing shut off during cold-crank start
• 1% initial voltage accuracy provides precise control of charging level to extend operating lifetime of battery
• Integrated power transistor and current sensor
• 10% trickle charge preconditions fully drained battery until it reaches 2.6V minimum charge level
• NTC thermistor input protects battery by monitoring temperature and shuts off charger when battery is outside the specified charging temperature
• Accepts Constant Current/Constant Voltage (CC/CV) types of voltage adapters or USB power
• AEC-Q100 Grade-3 qualified
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 solution from 12V lead acid battery to eCall battery.
Intersil; www.intersil.com/products/isl78693
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