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Li+ battery chargers boast flexibility

Posted: 26 Aug 2009 ?? ?Print Version ?Bookmark and Share

Keywords:battery charger? resistor? LDO? USB?

Maxim Integrated Products has introduced two new 28V, dual-/single-input, linear Li+ battery chargers with battery detection and overvoltage-protected outputs.

The MAX8844 and MAX8845 enhance flexibility by providing resistor-adjustable fast-charge and top-off current thresholds. Flexibility is further increased by an autobooting assistant circuit that distinguishes input sources and battery connection, and also provides an enable signal for system booting. The chargers are suited for space-constrained applications such as cellphones and smart phones.

The MAX8844 has two overvoltage-protected LDO outputs for supplying low-voltage-rated USB or charger inputs, while the MAX8845 has a single overvoltage-protected LDO output. This integration eliminates the need for external overvoltage-protection ICs. Both devices integrate a battery-pack detection circuit that disables the charger when the battery pack is absent.

The MAX8844 is packaged in a 3mm x 3mm, 14-pin TDFN, while the MAX8845 is available in a 3mm x 3mm, 12-pin TQFN package. Prices start at $1.42 (1000-up, FOB USA). User-friendly evaluation kits are available to speed designs.

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