BQ24747EVM

BQ24747EVM 1 Features

synchronous buck converter with programmable615kHz, 750kHz, and 885kHz switchingfrequencies • Automatic N-channel MOSFET selection ofsystem power source from adapter or batterydriven by internal charge pumps • Enhanced safety features for over voltageprotection, over current protection, battery,inductor and MOSFET short circuit protection • Programmable input current, charge voltage,charge current limits– ±0.5% Charge voltage accuracy up to 19.2V– ±3% Charge current accuracy up to 8.128A– ±3% Input current accuracy up to 8.064A– ±2% 20x Adapter current or charge currentamplifier output accuracy • Programmable battery depletion threshold, andbattery LEARN function • Programmable adapter detection and indicator • • • Real time system control on ILIM pin to limitIntegrated soft startIntegrated loop compensationcharge current • AC Adapter operating range 4.5V-24V5µA Off-state battery discharge current •0.65mA (0.8mA max) Adapter standby quiescent •current20-pin 3.5 x 3.5 mm2 VQFN Package •

BQ24747EVM 3 Description

The BQ24725A is a high-efficiency, synchronousbattery charger, offering low component countforspace-constraint, multi-chemistry battery chargingapplications.The BQ24725A utilizes two charge pumps toseparately drive n-channel MOSFETs(ACFET,RBFET and BATFET) for automatic system powersource selection.SMBus controlled input current, charge current, andcharge voltage DACs allow for very high regulationaccuracies that can be easily programmed by thesystem power management micro-controller.The BQ24725A uses internal input current register orexternal ILIM pin to throttle down PWM modulation toreduce the charge current.The BQ24725A charges one, two, three or four seriesLi+ cells.Device Information(1)

BQ24747EVM 2 Applications

• Portable notebook computers, UMPC, Ultra-thinnotebook, and Netbook • Handheld terminal • • Portable equipmentIndustrial and medical equipment