BQ24741EVM

BQ24741EVM DESCRIPTION

The bq24725 is a high-efficiency, synchronousbattery charger, offering low component countforspace-constraint, multi-chemistry battery chargingapplications.The bq24725 uses two charge pumps to separatelydrive n-channel MOSFETs (ACFET, RBFET andBATFET)sourceselection.system powerfor automaticSMBus controlled input current, charge current, andcharge voltage DACs allow for high regulationaccuracies that can be programmed by the systempower management micro-controller.input current register orThe bq24725 uses internalexternal ILIM pin to throttle down PWM modulation toreduce the charge current.The bq24725 charges two, three or four series Li+cells, and is available in a 20-pin, 3.5 x 3.5 mm2 QFNpackage.Synchronous Buck Converter withProgrammable 615kHz, 750kHz, and 885kHzSwitching Frequencies • 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,and Battery LERAN Function • Programmable Adapter Detection andIndicatorIntegrated Soft StartIntegrated Loop Compensation • • • Real Time System Control on ILIM pin to LimitCharge Current • AC Adapter Operating Range 9V-24V • •5µA Off-State Battery Discharge Current20-pin 3.5 x 3.5 mm2 QFN Package

BQ24741EVM APPLICATIONS

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