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28V Dual-/Single-Input Battery Chargers with Battery Detection and Overvoltage-Protected Outputs

20th August 2009

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Maxim has introduced the MAX8844/MAX8845 28V, dual-/single-input, linear Li+ battery chargers with battery detection and overvoltage-protected outputs. These devices enhance flexibility by providing resistor-adjustable fast-charge and top-off current thresholds. To further increase flexibility, an autobooting assistant circuit distinguishes input sources and battery connection, and also provides an enable signal for system booting. The MAX8844/MAX8845 are ideal for space-constrained applications such as cell phones and smartphones.

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.