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Dual-input charger needs no external MOSFETs

Posted: 01 Mar 2007 ?? ?Print Version ?Bookmark and Share

Keywords:battery charger? power management? Maxim? MOSFET? USB?

Maxim Integrated Products introduced the MAX8677A, a dual-input USB/AC-adapter linear charger with Smart Power Selector for portable devices powered by rechargeable single-cell Li+ batteries. This charger integrates all the power switches required for charging and switching the load between the battery and external power, thus eliminating the need for external MOSFETs.

When external power is connected, the Smart Power Selector allows the system to operate with no battery or a deeply discharged battery. It automatically switches the system load from the battery and makes use of limited USB or adapter power while charging the battery from input power not used by the system. All necessary current-sense circuitry is included on-chip with the integrated power switches. The charger measures 4-by-4mm and is housed in a 24-pin TQFN package that is specified for the extended temperature range of-40C to 85C.

The DC input's current limit is adjustable up to 2A, and both DC and USB inputs support 100mA, 500mA and USB-suspend modes. Charge current is adjustable up to 1.5A to support a wide range of battery capacities. Other MAX8677A features include thermal regulation, overvoltage protection, charge status and fault outputs, power-OK monitors, a battery thermistor monitor and a charge timer.

The device is currently available starting at $1.95 each in 1,000-piece quantities.

- Gina Roos

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