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BQ24735 Datasheet

Part NameBQ24735 TI
Texas Instruments TI
Description1- to 4-Cell Li+ Battery SMBus Charge Controller for Supporting Turbo Boost Mode With N-Channel Power MOSFET Selector
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Description
The bq24735 device is a high-efficiency, synchronous battery charger, offering low component count for space-constrained, multichemistry battery charging applications. The bq24735 device supports turbo boost by allowing battery discharge energy to the system when system power demand is temporarily higher than the adapter maximum power level so the adapter will not crash.
The bq24735 device 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 digital-to-analog converters (DACs) allow for very high-regulation accuracies that can be easily programmed by the system power management microcontroller.

Features
• Adapter and Battery Provide Power to System
   Together to Support Intel® CPU Turbo Boost
   Mode
• SMBus Host-Controlled NMOS-NMOS
   Synchronous Buck Converter With Programmable
   615-, 750-, and 885-kHz Switching Frequencies
• Automatic N-Channel MOSFET Selection of
   System Power Source From Adapter or Battery
   Driven by Internal Charge Pumps
• Enhanced Safety Features for Overvoltage
   Protection, Overcurrent Protection, Battery,
   Inductor and MOSFET Short-Circuit Protection
• Programmable Input Current, Charge Voltage,
   Charge Current Limits
   – ±0.5% Charge Voltage Accuracy up to 19.2 V
   – ±3% Charge Current Accuracy up to 8.128 A
   – ±3% Input Current Accuracy up to 8.064 A
   – ±2% 20× Adapter Current or Charge Current
      Amplifier Output Accuracy
• Programmable Battery Depletion Threshold, and
   Battery LEARN Function
• Programmable Adapter Detection and Indicator
• Integrated Loop Compensation and Soft Start
• Real-Time System Control on ILIM Pin to Limit
   Charge Current
• AC Adapter Operating Range: 4.5 V to 24 V
• 5-µA Off-State Battery Discharge Current
• 0.65 mA (0.8 mA Max) Adapter Standby
   Quiescent Current

Applications
• Portable Notebook Computers, UMPC, Ultra-Thin
   Notebooks, and Netbooks
• Handheld Terminals
• Industrial and Medical Equipment
• Portable Equipment

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