The ADP3806 is a complete Li-Ion battery-charging IC. Thedevice combines high output voltage accuracy with constantcurrent control to simplify the implementation of constantcurrent,constant-voltage (CCCV) chargers. The ADP3806 isavailable in three options: The ADP3806-12.6 guarantees thefinal battery voltage selected is 12.6 V or 16.8 V ± 0.6%, theADP3806-12.5 guarantees 12.525 V/16.7 V ± 0.6%, and theADP3806 is adjustable using two external resistors to set thebattery voltage. The current sense amplifier has rail-to-rail inputsto accurately operate under low dropout and short-circuit conditions.The charge current is programmable with a dc voltage onISET. A second differential amplifier senses the system currentacross an external sense resistor and outputs a linear voltageon the ISYS pin. The bootstrapped synchronous driver allowsthe use of two NMOS transistors for lower system cost.
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