DESCRIPTION

The bq24707 and bq24707A are high-efficiency, synchronous battery charger, offering low component count for space-constraint, multi-chemistry battery charging applications. SMBus controlled input current, charge current, and charge voltage DACs allow for very high regulation accuracies that can be easily programmed by the system power management micro-controller. The IC uses the internal input current register or external ILIM pin to throttle down PWM modulation to reduce the charge current. The IC provides an IFAULT output to alarm if any MOSFET fault or input over current occurs. This alarm output allows users to turn off input power selectors when the fault occurs. Meanwhile, an independent comparator with internal reference is available to monitor input current, output current, or output voltage. The IC charges one, two, three, or four series Li+ cells, and is available 3.5×3.5 mm2 QFN package.

APPLICATIONS

Portable Notebook Computers, UMPC, Ultra-Thin Notebook, and Netbook Personal Digital Assistant Handheld Terminal Industrial and Medical Equipment Portable Equipment

C3 0.1µF ACN VCC Controlled By Host C6 1µF REGN ILIM BTST 10uF Q5 (BATFET) C5 1µF Total Csys 220µF

= 750kHz, Iadpt = 4.096A, Ichrg = 2.944A, Ilim = 4A, Vchrg 12.592V, 90W adapter and 3S2P battery pack See the application information about negative output voltage protection for hard shorts on battery to ground or battery reverse connection.