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BQ24725ARGRRTIN/a2900avai1-4 Cell Li+ Battery SMBus Charge Controller with N-Channel Power MOSFET Selector 20-VQFN -40 to 85
BQ24725ARGRTTIN/a150avai1-4 Cell Li+ Battery SMBus Charge Controller with N-Channel Power MOSFET Selector 20-VQFN -40 to 85


BQ24725ARGRR ,1-4 Cell Li+ Battery SMBus Charge Controller with N-Channel Power MOSFET Selector 20-VQFN -40 to 85Pin Functions (continued)PINDESCRIPTIONNO. NAME12 SRN Charge current sense resistor negative input. ..
BQ24725ARGRT ,1-4 Cell Li+ Battery SMBus Charge Controller with N-Channel Power MOSFET Selector 20-VQFN -40 to 85 SLUSAL0A–SEPTEMBER 2011–REVISED AUGUST 20145 Pin Configuration and FunctionsRGR PackageTop View20 ..
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BQ24725ARGRR-BQ24725ARGRT
1-4 Cell Li+ Battery SMBus Charge Controller with N-Channel Power MOSFET Selector
RSR
Adapter4.5-24V
HOST
bq24725A
HybridPower
BoostCharge
Controller
SYS
Battery
Pack
N-FETDriver
N-FETDriver
1S-4SSMBus
SMBusControlsV&I
withhigh accuracy
AdapterDetection
EnhancedSafety:
OCP,OVP,FETShort
Integration:
LoopCompensation;Soft-Start
Comparator
RAC
Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
bq24725A

SLUSAL0A –SEPTEMBER 2011–REVISED AUGUST 2014
bq24725A 1-4 Cell Li+ Battery SMBus Charge Controller with N-Channel Power MOSFET
Selector and Advanced Circuit Protection Features 3 Description

The bq24725A isa high-efficiency, synchronous SMBus Host-Controlled NMOS-NMOS battery charger, offering low component count forSynchronous Buck Converter with Programmable space-constraint, multi-chemistry battery charging615kHz, 750kHz, and 885kHz Switching applications.Frequencies
The bq24725A utilizes two charge pumps to• Automatic N-channel MOSFET Selectionof separately drive n-channel MOSFETs (ACFET,System Power Source from Adapteror Battery RBFET and BATFET) for automatic system powerDrivenby Internal Charge Pumps source selection.• Enhanced Safety Features for Over Voltage SMBus controlled input current, charge current, andProtection, Over Current Protection, Battery, charge voltage DACs allow for very high regulationInductor and MOSFET Short Circuit Protection accuracies that can be easily programmed by the• Programmable Input Current, Charge Voltage, system power management micro-controller.Charge Current Limits The bq24725A uses internal input current registeror– ±0.5% Charge Voltage Accuracy upto 19.2V external ILIM pinto throttle down PWM modulationto– ±3% Charge Current Accuracyupto 8.128A reduce the charge current. ±3% Input Current Accuracyupto 8.064A The bq24725A charges one, two, threeor four series ±2% 20x Adapter Currentor Charge Current Li+ cells.
Amplifier Output Accuracy
Device Information(1)
• Programmable Battery Depletion Threshold, andBattery LEARN Function• Programmable Adapter Detection and Indicator
(1) Forall available packages, see the orderable addendumat• Integrated Soft Start the endofthe datasheet.• Integrated Loop Compensation Real Time System Controlon ILIM pinto Limit
Charge Current AC Adapter Operating Range 4.5V-24V 5µA Off-State Battery Discharge Current 0.65mA (0.8mA max) Adapter Standby Quiescent
Current 20-pin 3.5x 3.5 mm2 VQFN Package Applications Portable Notebook Computers, UMPC, Ultra-Thin Netbook Equipment
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