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Linear battery chargers

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article image Maximises battery capacity, lifecycle and safety.

MICROCHIP Technology has released single-cell and a dual-cell charge-management controllers with a charge-safety timer and a temperature monitor.

With an overall system accuracy of ±0.5%, the devices maximise system runtime between charges and ensure that the battery-cell capacity is fully used without cycle life degradation. The onboard thermal regulation optimises charge-cycle time, while maintaining the devices' reliability and simplifying board design.

The MCP7386X devices extract information regarding charge and temperature status. Onboard safety timers and a thermal monitor provide time and temperature-based charge termination, protecting applications from defective batteries and increasing battery safety. The MCP7386X controllers also feature reverse-blocking protection, which allows current from a correctly installed battery to flow to the load and block current flow to a backward-installed battery.

The MCP7386X family has an inbuilt pass transistor, which minimises the number of external components and the overall footprint. The controllers extend battery life with a reverse leakage current of less than 0.4μA (typical) and supply a programmable fast-charge current up to 1.2A. The MCP73861 is specified from 4.5V to 12V, the MCP73862 from 8.7V to 12V and both come with a –40°C to +85°C temperature range. They are available in 4.1V/4.2V and 8.2V/8.4V to accommodate a variety of portable products that are powered by one or two-cell Lithium Ion/Lithium Polymer batteries (with coke or graphite anodes).

The MCP7386X devices are offered in a Pb-free, leadless, 4x4, QFN package, which allows for higher power dissipation and shorter charging times.

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