Switch-mode charger controller simplifies constant current control

5 June 2002 Power Electronics / Power Management

The ADP3806 is a standalone Li-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 (CCCV) chargers. According to the manufacturer, Analog Devices, the industry's highest end-of-voltage accuracy levels are achieved to within ±0,4% at 25°C, ±0,6% at 5°C to 55°C and ±0,7% at 0°C to 85°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, undervoltage lockout and a bootstrapped synchronous drive for external NMOS FETs. (Synchronous operation provides high efficiency when charging at high current.) The ADP3806 is designed primarily for notebook PCs as well as fast chargers and handheld devices such as PDAs.

Three models of the ADP3806 offer adjustable battery voltages guaranteed to within ±0,6% of their specified value: the ADP3806-12.6 can be set to either 12,6 or 16,8 V, the ADP3806-12.5 can be either 12,525 or 16,7 V, and the adjustable version is useful for charging one- or two-cell Li-Ion batteries, or for custom Li-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 drop out and short circuit conditions.

All models of the ADP3806 are housed in a 24-lead TSSOP package.

Analog Data Products SA

011 531 1400

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