Analog Devices Presents ADP3806 Battery-Charging IC

Analog Devices Inc. (Norwood, MA) announced the ADP3806, a stand-alone, lithium-ion, battery-charging IC that combines high output-voltage accuracy with precise current control to improve the performance and reduce the design complexity of constant-current, constant-voltage chargers. The ADP3806 is designed primarily for notebook PCs as well as fast chargers and hand-held devices such as personal digital assistants.

High end-of-voltage accuracy levels are achieved to within ±0.4 percent at 25 degrees C, ±0.6 percent at 5 to 55 degrees C and ±0.7 percent at 0 to 85 degrees C. Application flexibility is built in with three selectable voltage options, programmable charge currents and programmable oscillator frequencies. Functional integration includes automatic current sensing with reverse input protection, under-voltage lockout and a bootstrapped synchronous drive for external N MOSFETs.

Three models of the ADP3806 offer adjustable battery voltages guaranteed to within ±0.6 percent of their specified value: the ADP3806-12.6 can be set to either 12.6V or 16.8V, the ADP3806-12.5 can be set to either 12.525V or 16.7V, and the adjustable version is useful for charging one- or two-cell lithium-ion batteries, or for custom lithium-ion cells. As a battery approaches its final voltage, the ADP3806 switches from constant-current mode to constant-voltage mode. The on-board current sense amplifier accepts rail-to-rail inputs to ensure precise and controlled operation under low dropout and short-circuit conditions.

All models of the ADP3806 are housed in a 24-lead TSSOP package, available on tape and reel, and priced at $2.25 per unit in 10,000-piece quantities.