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Li-Ion/Li-Polymer Chargers Enable Auto USB or AC Power-Source Selection

Mon, 12/10/2007 - 8:15am

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Microchip Technology Inc. announced the MCP73837 and MCP73838 dual-input, high-current Li-Ion/Polymer charge-management controllers with automatic USB or AC adapter power-source selection. Microchip Technology Inc. announced the MCP73837 and MCP73838 dual-input, high-current Li-Ion/Polymer charge-management controllers with automatic USB or AC adapter power-source selection. The single-cell, fully integrated chargers enable charge currents of up to 1A from an AC power source, plus charging currents of up to 100 mA or 500 mA from a USB port.  They have several on-chip safety features, and are available in 10-pin MSOP and 3 mm x 3 mm DFN packages, to enable smaller, faster and safer battery-charger designs. Auto power-source selection from either a USB port or AC adapter means that MCP73837/8-based charger designs can automatically charge from a PC’s USB port when no AC power is available.  When powered from a USB port, the devices ensure compliance with USB power specifications and adjust outputs accordingly.  The result is that one charger design can support multiple power sources.  Additionally, with high charge currents up to 1A from an AC power source, the MCP73837/8 devices enable faster charging cycles and less recharging down time.  On-chip safety features, such as thermal regulation, cell-temperature monitoring and charge-timers minimize charger-related system damage, resulting in safer and more efficient charger designs.  It is priced at $40 each.
Microchip Technology Inc
888-628-6247, www.microchip.com

Click here for more information: at www.microchip.com/MCP73837

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