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BQ24721 Status: NRND

Smart Battery Charger with SMBus & System Power Selector


      
         
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Alert Icon   NRND: This product is not recommended for new designs. However, the device, tool, or software continues to be in production to support existing customers. TI does not recommend using this part in a new design. TI encourages designers to consider alternative products for new designs.

Replaced By:

  • BQ24721C The device is an EXACT EQUIVALENT in functionality and parametrics to the compared device. 
 BQ24721C 
# Series Cells3-4  
Control TopologySwitchmode  
Switching Frequency(kHz)300 or 500  
Primary Charge Termination MethodHost Controlled  
Pin/Package32QFN  
 Samples
 Inventory

Product Information

Features

  • High Efficiency NMOS-NMOS Synchronous Buck Converter With User-Selectable 300 kHz or 500 kHz frequency
  • bq24721C Offers Softer Turn-On, Stronger Turn-Off
  • SBS-Like(1) SMBus Interface for Control and Status Communications With Host
  • Programmable Battery Voltage, Charge Current, and AC Adapter Current via SBS-Like SMBus Interface
  • 0.4% Charge Voltage Regulation Accuracy
  • 3% Charge Current Regulation Accuracy
  • 3% Adapter Current Regulation Accuracy Dynamic Power Management (DPM)
  • 2% Accuracy Integrated Charge and AC Adapter 20× Current Amplifier Output
  • 3-Cell and 4-Cell Li-Ion Voltage Regulation 9 V, 12 V-14.4 V, 16 V-19.2 V
  • Battery Pack Voltage Operating Range 0 V-19.2 V
  • AC Adapter Operating Range 8 V-28 V
  • 99.5% Max Duty Cycle
  • Internal Soft Start
  • Integrated 5% 5-V LDO When AC Adapter Applied
  • 6-V Drive Supply Voltage for Increased Efficiency
  • Reverse Battery to Adapter Discharge Protection
  • Battery/Adapter to System Power Selector Function
  • Charge and Adapter Overcurrent Protection
  • Battery Thermistor Sense, TS, Comparators
  • Available in 32-Pin 5x5-mm QFN Package
  • APPLICATIONS
    • Portable Notebook Computers
    • Portable DVD Players
    • Webpads, PC Tablets

(1) SBS-Like interface is not 100% SBS compliant. SBS-Like interface is SMBus1.1 complaint but does not support Packet Error Correction (PEC). The control and status registers were changed to simplify and enhance notebook charger control. An 8-bit address (0x12) is used.
PowerPAD is a trademark of Texas Instruments.

Description

The bq24721 is a high efficiency synchronous battery pack charger with high level of integration for portable applications. This device implements a high performance analog front-end that interfaces to the system power management micro-controller through a simplified SBS-like SMBus interface.

The dynamic power management (DPM) function modifies the charge current depending on system load conditions, avoiding ac adapter overload.

High accuracy current sense amplifiers enable accurate measurement of either the charge current or the ac adapter current, allowing termination of nonsmart packs and monitoring of overall system power.

The adapter isolation diode can be bypassed or entirely replaced with an external MOSFET using a control signal provided by the bq24721, thus reducing overall power dissipation.

Integrated features such as charger soft start, charge overcurrent protection, and IC temperature monitoring provide a second level of protection, in addition to pack and system protection functions.

    

Pricing / Packaging / CAD Design Tools / Samples

PackagingCAD Design ToolsSamples
DeviceStatusTemp (oC)Replaced ByPackage | PinsTop Side MarkingSymbolsSamples
BQ24721RHBROBSOLETE-40 to 85BQ24721CRHBRQFN (RHB) | 32 View Download CAD Format for this SymbolReplaced by BQ24721CRHBR
BQ24721RHBRG4OBSOLETE-40 to 85BQ24721CRHBRG4QFN (RHB) | 32 View Download CAD Format for this SymbolReplaced by BQ24721CRHBRG4
BQ24721RHBTOBSOLETE-40 to 85BQ24721CRHBTQFN (RHB) | 32 View Download CAD Format for this SymbolReplaced by BQ24721CRHBT
BQ24721RHBTG4OBSOLETE-40 to 85BQ24721CRHBTG4QFN (RHB) | 32 View Download CAD Format for this SymbolReplaced by BQ24721CRHBTG4

Inventory

Reported Distributor Inventory as of 12:06 PM GMT, 08 Nov 2009
RegionCompanyIn StockPurchase
Call**BQ24721RHBR
AmericasRochester Electronics >1k
Call**BQ24721RHBT
AmericasRochester Electronics >1k
View all Distributors  

** Lead time information is not available at this time. However, our information is updated daily so please check back with us soon. Please contact your preferred TI Authorized Distributor for additional information.

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Technical Documents

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Application Notes

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Tools & Software

NamePart # Company Tool / Software Type
BQ24721 Evaluation ModuleBQ24721EVMTexas InstrumentsDevelopment Boards/EVMs
Quick Search Selection Tool for Battery ChargersBATTERY_CHARGERS_SELECTION_TOOLTexas InstrumentsFree Evaluation Tools

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