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BQ24721C Status: ACTIVE

Smart Battery Charger with SMBus and System Power Selector, Softer Turn-On


      
         
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 BQ24721C
# Series Cells3-4  
Control TopologySwitchmode  
Switching Frequency(kHz)300 or 500  
Primary Charge Termination MethodHost Controlled  
Pin/Package32QFN  
 Samples
 Inventory

Customers Who Evaluated This Product Also Evaluated

  • BQ2954: Switch-mode Li-Ion Charge Controller
  • BQ24750A: Host-controlled Multi-chemistry Battery Charger w/Integrated Sys Power Selector
  • BQ24740: Multi-Cell Synchronous Switch-mode Battery Charger
  • BQ77PL900: 5-10 cell Li-ion Battery protection & AFE
  • BQ78PL114: PowerLAN Gateway Battery Management Controller with PowerPump Cell Balancing
  • PTH08T240W: 10-A, 4.5V to 14V Input, Non-Isolated, Wide Output Adjustable Power Module with TurboTrans

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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

PricePackagingCAD Design ToolsSamples
DeviceStatusTemp (oC)Price | QuantityPackage | PinsTop Side MarkingPackage QTY | Package CarrierSymbolsSamples
BQ24721CRHBRACTIVE-40 to 852.70 | 1kuQFN (RHB) | 32 View 3000 | LARGE T&R Download CAD Format for this Symbol
BQ24721CRHBRG4ACTIVE-40 to 852.70 | 1kuQFN (RHB) | 32 View 3000 | LARGE T&R Download CAD Format for this Symbol
BQ24721CRHBTACTIVE-40 to 853.00 | 1kuQFN (RHB) | 32 View 250 | SMALL T&R Download CAD Format for this SymbolPurchase Samples
BQ24721CRHBTG4ACTIVE-40 to 853.00 | 1kuQFN (RHB) | 32 View 250 | SMALL T&R Download CAD Format for this SymbolPurchase Samples

* Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For higher volume price quotes,prices in local currency or delivery quotes, please contact your local Texas Instruments Sales Office or Authorized Distributor.

Inventory

Reported Distributor Inventory as of 12:06 PM GMT, 08 Nov 2009
RegionCompanyIn StockPurchase
TI Lead Time*: 20 WeeksBQ24721CRHBR
WorldwideDigiKey >1k
Mouser Electronics >1k
TI Lead Time*: 20 WeeksBQ24721CRHBRG4
WorldwideDigiKey  Available
TI Lead Time*: 20 WeeksBQ24721CRHBT
WorldwideDigiKey  Available
TI Lead Time*: 20 WeeksBQ24721CRHBTG4
WorldwideDigiKey  Available
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.

Quality & Lead (Pb)-Free Data

 Product ContentDPPM / MTBF / FIT Rate
DeviceEco Plan* Lead / Ball FinishMSL Rating / Peak ReflowDetailsDetails
BQ24721CRHBR RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
BQ24721CRHBRG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
BQ24721CRHBT RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
BQ24721CRHBTG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView

* The planned eco-friendly classification: Pb-Free (RoHS) or Pb-Free (RoHS Exempt) or Green (RoHS & no Sb/Br) - please click on the Product Content Details "View" link in the table above for the latest availability information and additional product content details.

If the information you are requesting is not available online at this time, contact one of our Product Information Centers regarding the availability of this information.

Technical Documents

Most useful technical documents for BQ24721C Help

Datasheet

Application Notes

View Application Notes for Battery Charge Management

User Guides

View User Guides for Battery Charge Management

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

Customers Who Evaluated This Product Also Evaluated...
Part # Name Product Family Comments
BQ2954 Switch-mode Li-Ion Charge Controller BATTERY MANAGEMENT-BATTERY CHARGE MANAGEMENT TI customers also evaluated this product.
BQ24750A Host-controlled Multi-chemistry Battery Charger w/Integrated Sys Power Selector BATTERY MANAGEMENT-BATTERY CHARGE MANAGEMENT TI customers also evaluated this product.
BQ24740 Multi-Cell Synchronous Switch-mode Battery Charger BATTERY MANAGEMENT-BATTERY CHARGE MANAGEMENT TI customers also evaluated this product.
BQ24753A Host-Controlled Li-Ion and Li-Polymer Battery Charger with Low Iq and System Power Selector BATTERY MANAGEMENT-BATTERY CHARGE MANAGEMENT TI customers also evaluated this product.
BQ24745 SMBus-Controlled Level 2 Multi-Chemistry Battery Charger With Input Current Detect Comparator BATTERY MANAGEMENT-BATTERY CHARGE MANAGEMENT TI customers also evaluated this product.
BQ24702 Multi-Chemistry Battery Charge Controller and System Power Selector BATTERY MANAGEMENT-BATTERY CHARGE MANAGEMENT TI customers also evaluated this product.
BQ24703 Multi-Chemistry Battery Charge Controller and System Power Selector BATTERY MANAGEMENT-BATTERY CHARGE MANAGEMENT TI customers also evaluated this product.
BQ24105 Standalone Synchronous Switch-Mode Li-Ion Charger w/2A FET in QFN-20, 1 to 3 Cells BATTERY MANAGEMENT-BATTERY CHARGE MANAGEMENT TI customers also evaluated this product.
BQ24741 Multi-Cell Synchronous Switch-mode Charger With Low Iq and Accurate Trickle Charge BATTERY MANAGEMENT-BATTERY CHARGE MANAGEMENT TI customers also evaluated this product.
BQ24751B Multi-Cell Synchronous Switch-mode Charger in 5x5 QFN BATTERY MANAGEMENT-BATTERY CHARGE MANAGEMENT TI customers also evaluated this product.
BQ77PL900 5-10 cell Li-ion Battery protection & AFE BATTERY MANAGEMENT-LITHIUM ION PROTECTION TI customers also evaluated this product.
BQ78PL114 PowerLAN Gateway Battery Management Controller with PowerPump Cell Balancing BATTERY MANAGEMENT-BATTERY FUEL GAUGES TI customers also evaluated this product.
PTH08T240W 10-A, 4.5V to 14V Input, Non-Isolated, Wide Output Adjustable Power Module with TurboTrans PLUG-IN POWER MODULES-NON-ISOLATED POL TI customers also evaluated this product.
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TPS63002 96% Buck-Boost Converter with 1.7A Current Switches, 5V fixed Output voltage in 3x3 QFN DC/DC CONVERTERS (INTEGRATED SWITCH)-BUCK-BOOST REGULATORS TI customers also evaluated this product.
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