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BQ24725A Datasheet(PDF) 1 Page - Texas Instruments |
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BQ24725A Datasheet(HTML) 1 Page - Texas Instruments |
1 / 47 page R SR Adapter 4.5-24V HOST bq24725A Hybrid Power Boost Charge Controller SYS Battery Pack N-FET Driver N-FET Driver 1S-4S SMBus SMBus Controls V & I with high accuracy Adapter Detection Enhanced Safety: OCP, OVP, FET Short Integration: Loop Compensation; Soft-Start Comparator R AC 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 1 Features 3 Description The bq24725A is a high-efficiency, synchronous 1 • SMBus Host-Controlled NMOS-NMOS battery charger, offering low component count for Synchronous Buck Converter with Programmable space-constraint, multi-chemistry battery charging 615kHz, 750kHz, and 885kHz Switching applications. Frequencies The bq24725A utilizes two charge pumps to • Automatic N-channel MOSFET Selection of separately drive n-channel MOSFETs (ACFET, System Power Source from Adapter or Battery RBFET and BATFET) for automatic system power Driven by Internal Charge Pumps source selection. • Enhanced Safety Features for Over Voltage SMBus controlled input current, charge current, and Protection, Over Current Protection, Battery, charge voltage DACs allow for very high regulation Inductor 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 register or – ±0.5% Charge Voltage Accuracy up to 19.2V external ILIM pin to throttle down PWM modulation to – ±3% Charge Current Accuracy up to 8.128A reduce the charge current. – ±3% Input Current Accuracy up to 8.064A The bq24725A charges one, two, three or four series – ±2% 20x Adapter Current or Charge Current Li+ cells. Amplifier Output Accuracy Device Information(1) • Programmable Battery Depletion Threshold, and PART NUMBER PACKAGE BODY SIZE (NOM) Battery LEARN Function bq24725A VQFN (20) 3.50mm x 3.50mm • Programmable Adapter Detection and Indicator (1) For all available packages, see the orderable addendum at • Integrated Soft Start the end of the datasheet. • Integrated Loop Compensation • Real Time System Control on ILIM pin to 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 3.5 x 3.5 mm2 VQFN Package 2 Applications • Portable Notebook Computers, UMPC, Ultra-Thin Notebook, and Netbook • Handheld Terminal • Industrial and Medical Equipment • Portable Equipment 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. |
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