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Linear Battery Chargers – single-cell and a dual cell versions

Microchip announced a single-cell and a dual cell versions of a fully-integrated, charge-management controller featuring a charge-safety timer and a temperature monitor. The devices are introduced alongside the company's range of DC-DC Converters, Linear Regulators and Powersmart battery managers and monitors.

The MCP7386X devices monitor charge and temperature status, giving the user full control and sophisticated protection. With an overall accuracy of ±0.5 percent, the devices maximise system runtime between charges and ensure that the battery-cell capacity is fully utilised without cycle-life degradation. Onboard safety timers and thermal monitor provide time- and temperature-based charge termination, protecting applications from defective batteries and increasing the battery safety.

The devices also feature reverse-blocking protection, preventing an incorrectly installed battery from damaging the application. The MCP7386X family features a built-in pass transistor, which minimises the number of external components and the overall footprint. In addition, these controllers extend battery life with a reverse leakage current of less than 0.4 microamps (typical) and supply a programmable fast-charge current up to 1.2A.

The MCP73861 device is specified from 4.5V to 12V; the MCP73862 device from 8.7V to 12V and both operate over a -40&#176C to +85&#176C temperature range.

They are available in 4.1V/4.2V and 8.2V/8.4V to support one- or two-cell Lithium lon / Lithium Polymer batteries (with coke or graphite anodes).

The devices are offered in a Pb-free 4x4mm QFN package, which features excellent power dissipation, and therefore supports shorter charging times.

Microchip Technology , Wokingham, Berks RG41 5TU, UK.
www.microchip.com

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