The ISL78692 battery charger dissipates less leakage current (3µA) than other solutions, allowing the backup battery to remain charged for a longer period. The low charging voltage also extends battery life, while the device's smaller footprint reduces the overall size of the solution.
Vehicles equipped with eCall systems automatically place a call to an emergency services center in the event of an accident. The ISL78692 Li-ion battery charger is designed to support new emergency call systems worldwide, such as the eCall initiative in Europe, which provides rapid assistance to motorists involved in a collision anywhere in the European Union, and OnStar®, which offers a safety service in the United States.
The ISL78692 charger's ability to monitor battery temperature and its low 4.1V output voltage help extend the life of LiFePO4 batteries. Highly integrated, the ISL78692 requires only five external components to program the charging current. When combined with the charger's compact 3mm x 3mm DFN package, the complete solution fits easily onto a space-constrained printed circuit board. The ISL78692 also features thermal foldback charging current, preventing overheating by automatically reducing the battery's charging current, resulting in a small, robust design.
Features and Specifications:
• Complete charger for single-cell lithium batteries
• 3uA (max) leakage in a temperature range of -40°C to 85°C increases the time the backup battery remains charged when the Vin power supply is off
• Up to 1A programmable charging current allows a trade-off between battery charging time and heat dissipation and battery life
• Guaranteed operation down to 2.65V after startup, preventing shutdown during cold starts
• 1% initial voltage accuracy provides precise charge level control to extend battery operating life
• Integrated power transistor and current sensor
• 10% precondition trickle charge from a fully drained battery to the minimum charge level of 2.8V
• NTC thermistor input protects the battery by monitoring the temperature and shutting off the charger when the battery is outside the specified charging temperature
• AEC-Q100 Grade 3 rated
Availability:
The ISL78692 Li-ion battery charger is now available in a 3mm x 3mm 10-pin DFN package. The ISL78692 is supported by the ISL78692EVAL1Z evaluation board.
