BQ24725 Series

SMBus 2-4 cell Buck battery charge controller with N-Channel power MOSFET selector

Catalog

SMBus 2-4 cell Buck battery charge controller with N-Channel power MOSFET selector

Part	Operating Temperature [Min]	Operating Temperature [Max]	Number of Cells [Min]	Number of Cells [Max]	Fault Protection	Battery Pack Voltage	Mounting Type	Package / Case	Interface	Battery Chemistry	Current - Charging	Voltage - Supply (Max) [Max]
Texas Instruments BQ24725RGRT	0 °C	125 ¯C	2 cells	4	Over Current Over Voltage Short Circuit	19.2 V	Surface Mount	20-VFQFN Exposed Pad	I2C	Lithium Ion	Constant - Programmable	24 V

Catalog

SMBus 2-4 cell Buck battery charge controller with N-Channel power MOSFET selector

Key Features

• SMBus Host-Controlled NMOS-NMOS Synchronous Buck Converter withProgrammable 615kHz, 750kHz, and 885kHz Switching FrequenciesAutomatic N-channel MOSFET Selection of System Power Source fromAdapter or Battery Driven by Internal Charge PumpsEnhanced Safety Features for Over Voltage Protection, Over CurrentProtection, Battery, Inductor and MOSFET Short Circuit ProtectionProgrammable 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 Current AmplifierOutput AccuracyProgrammable Battery Depletion Threshold, and Battery LERAN FunctionProgrammable Adapter Detection and IndicatorIntegrated Soft StartIntegrated Loop CompensationReal Time System Control on ILIM pin to Limit Charge CurrentAC Adapter Operating Range 9V-24V5µA Off-State Battery Discharge Current20-pin 3.5 × 3.5 mm2QFN PackageAPPLICATIONSPortable Notebook Computers, UMPC, Ultra-Thin Notebook, and NetbookPersonal Digital AssistantHandheld TerminalIndustrial and Medical EquipmentPortable EquipmentPowerPAD is a trademark of Texas Instruments.SMBus Host-Controlled NMOS-NMOS Synchronous Buck Converter withProgrammable 615kHz, 750kHz, and 885kHz Switching FrequenciesAutomatic N-channel MOSFET Selection of System Power Source fromAdapter or Battery Driven by Internal Charge PumpsEnhanced Safety Features for Over Voltage Protection, Over CurrentProtection, Battery, Inductor and MOSFET Short Circuit ProtectionProgrammable 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 Current AmplifierOutput AccuracyProgrammable Battery Depletion Threshold, and Battery LERAN FunctionProgrammable Adapter Detection and IndicatorIntegrated Soft StartIntegrated Loop CompensationReal Time System Control on ILIM pin to Limit Charge CurrentAC Adapter Operating Range 9V-24V5µA Off-State Battery Discharge Current20-pin 3.5 × 3.5 mm2QFN PackageAPPLICATIONSPortable Notebook Computers, UMPC, Ultra-Thin Notebook, and NetbookPersonal Digital AssistantHandheld TerminalIndustrial and Medical EquipmentPortable EquipmentPowerPAD is a trademark of Texas Instruments.

Description

The bq24725 is a high-efficiency, synchronous battery charger, offering low component count for space-constraint, multi-chemistry battery charging applications. The bq24725 uses two charge pumps to separately drive n-channel MOSFETs (ACFET, RBFET and BATFET) for automatic system power source selection. SMBus controlled input current, charge current, and charge voltage DACs allow for high regulation accuracies that can be programmed by the system power management micro-controller. The bq24725 uses internal input current register or external ILIM pin to throttle down PWM modulation to reduce the charge current. The bq24725 charges two, three or four series Li+ cells, and is available in a 20-pin, 3.5 × 3.5 mm2QFN package. The bq24725 is a high-efficiency, synchronous battery charger, offering low component count for space-constraint, multi-chemistry battery charging applications. The bq24725 uses two charge pumps to separately drive n-channel MOSFETs (ACFET, RBFET and BATFET) for automatic system power source selection. SMBus controlled input current, charge current, and charge voltage DACs allow for high regulation accuracies that can be programmed by the system power management micro-controller. The bq24725 uses internal input current register or external ILIM pin to throttle down PWM modulation to reduce the charge current. The bq24725 charges two, three or four series Li+ cells, and is available in a 20-pin, 3.5 × 3.5 mm2QFN package.