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Input current limited battery

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MAXIM Integrated Products has released the MAX8724, a highly integrated, accurate, and efficient battery-charger IC for notebook and sub-notebook computers. It is available from Arrow Electronics .

The MAX8724 charges two to four lithium-ion (Li+) cells in series at charge currents greater than 5A. The high dc to dc conversion efficiency is achieved through a synchronous-buck topology. This IC can be hardwired or controlled by a microprocessor.

The MAX8724 provides 0.5% accurate battery-voltage regulation, which enhances battery capacity and minimises charging time. The charge-current regulation accuracy is 5%. Analogue inputs control the input-current limit, charge current, and voltage.

The device provides three monitoring outputs that simplify design and save external device costs and board space. These include two analogue monitor outputs for charge current and input current as well as a digital output for detecting ac adapter presence.

The MAX8724 also provides ac-adaptor current limiting. The IC monitors the current drawn from the adapter and adjusts the charge current to a level so as to avoid overloading the adapter. This feature enables system operation with inexpensive AC adapters.

The MAX8724 is available in a space-saving, 28-pin QFN (5mm x 5mm) package and is specified for the extended temperature range of -40°C to +85°C .

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