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Li-ion/polymer chargers feature auto USB, AC source selection

Posted: 14 Dec 2007 ?? ?Print Version ?Bookmark and Share

Keywords:Li-ion battery? polymer chargers? auto source selection?

Microchip Technology Inc. has announced the MCP73837 and MCP73838 (MCP73837/8) 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 100mA or 500mA from a USB port. They have several on-chip safety features, and are available in 10-pin MSOP and 3mm x 3mm 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.

"The MCP73837/8 chargers offer the best combination of key features, performance, safety and package options of any dual-input, auto-switching integrated battery charger on the market," said Bryan Liddiard, VP of marketing for Microchip's analog and interface products division.

"Additionally, with numerous key charging parameter combinations as standard, these devices are flexible enough for use in a broad range of applications."

"Today's battery-powered applications require better combinations of features, performance and safety," said Bill Barrett, product line marketing manager for Microchip's analog and interface products division. "Moreover, due to the ubiquity of USB ports, more applications are utilizing USB-port charging. The MCP73837/8 chargers were designed with these trends in mind, along with designers' needs for safer, more efficient chargers in small packages."

In addition to VREG output and safety timeout period, charging parameters available as standard options on the MCP73837/8 devices include preconditioning current threshold and current ratio, charge termination threshold and recharge threshold ratio. The devices are suitable for portable, battery-powered consumer electronic devices, such as PDAs, portable DVD players and personal media players (PMPs), among others.

The MCP73837/8 chargers are available in 10-pin MSOP and 3mm x 3mm DFN packages, for 89 cents each in 10,000-unit quantities. Samples are available and volume-production orders can be placed today.




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