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BQ24705 Status: ACTIVE

Host-Controlled Multi-Chemistry Battery Charger With Low Input Power Detect


      
         
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 BQ24705
# Series Cells2-4  
Charge Current(Max)(A)8  
Charge Status Outputs1  
Control TopologySwitchmode  
Switching Frequency(kHz)600  
Primary Charge Termination MethodHost Controlled  
Pin/Package24VQFN  
Vin(Max)(V)24  
Battery Charge Voltage(V)4  
 Samples
 Inventory

Customers Who Evaluated This Product Also Evaluated

  • BQ24745: SMBus-Controlled Level 2 Multi-Chemistry Battery Charger With Input Current Detect Comparator
  • BQ24105: Standalone Synchronous Switch-Mode Li-Ion Charger w/2A FET in QFN-20, 1 to 3 Cells
  • BQ24753: Host-Controlled Multi-Chemistry Battery Charger with Low Iq and System Power Selector
  • TPS51125: Dual-Synchronous, Step-Down Controller with Out-of-AudioT Operation and 100-mA LDOs
  • TL431A: Adjustable Precision Shunt Regulator
  • BQ27541: Single Cell Li-Ion Battery Fuel Gauge for Battery Pack Integration

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Product Information

Features

  • NMOS-NMOS Synchronous Buck Converter with 600 kHz Frequency and >95% Efficiency
  • 30-ns Minimum Driver Dead-time and 99.5% Maximum Effective Duty Cycle
  • High-Accuracy Voltage and Current Regulation
    • ±0.5% Charge Voltage Accuracy
    • ±3% Charge Current Accuracy
    • ±3% Adapter Current Accuracy
    • ±2% Input Current Sense Amp Accuracy
  • Integration
    • Internal Loop Compensation
    • Internal Soft-Start
  • Safety
    • Input Overvoltage Protection (OVP)
    • Dynamic Power Management (DPM) with Status Indicator
  • Supports Two, Three, or Four Li+ Cells
  • 5 - 24 V AC/DC-Adapter Operating Range
  • Analog Inputs with Ratiometric Programming via Resistors or DAC/GPIO Host Control
    • Charge Voltage (4-4.512 V/cell)
    • Charge Current (up to 8 A, with 10-m Sense Resistor)
    • Adapter Current Limit (DPM)
  • Status and Monitoring Outputs

View All Features in Datasheet

Description

The bq24705 is a high-efficiency, synchronous battery charger with integrated compensation, offering low component count for space-limited multi-chemistry battery charging applications. Charge current and voltage programming allows high regulation accuracies, and can be either hardwired with resistors, or programmed by the system power-management microcontroller using a DAC or GPIOs.

The bq24705 charges two, three, or four series Li+ cells, supporting up to 8 A of charge current, and is available in a 24-pin, 4x4-mm thin QFN package.

The bq24705 features Dynamic Power Management (DPM) and input power limiting. These features reduce battery charge current when the input power limit is reached to avoid overloading the AC adapter when supplying the load and the battery charger simultaneously.

View All Description in Datasheet

    

Pricing / Packaging / CAD Design Tools / Samples

PricePackagingCAD Design ToolsSamples
DeviceStatusTemp (oC)Price | QuantityPackage | PinsTop Side MarkingPackage QTY | Package CarrierSymbolsSamples
BQ24705RGERACTIVE0 to 1252.20 | 1kuVQFN (RGE) | 24 View 3000 | LARGE T&R Download CAD Format for this Symbol
BQ24705RGERG4ACTIVE0 to 1252.20 | 1kuVQFN (RGE) | 24 View 3000 | LARGE T&R 
BQ24705RGETACTIVE0 to 1252.45 | 1kuVQFN (RGE) | 24 View 250 | SMALL T&R Download CAD Format for this SymbolPurchase Samples
BQ24705RGETG4ACTIVE0 to 1252.45 | 1kuVQFN (RGE) | 24 View 250 | SMALL T&R Purchase 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 12:13 PM GMT, 22 Nov 2009
RegionCompanyIn StockPurchase
TI Lead Time*: 20 WeeksBQ24705RGER
WorldwideDigiKey >1k
TI Lead Time*: 20 WeeksBQ24705RGERG4
WorldwideDigiKey  Available
TI Lead Time*: 16 WeeksBQ24705RGET
AsiaFarnell Asia 107
EuropeFarnell 107
WorldwideDigiKey  Available
TI Lead Time*: 16 WeeksBQ24705RGETG4
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
BQ24705RGER RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
BQ24705RGERG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
BQ24705RGET RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
BQ24705RGETG4 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 BQ24705 Help

Datasheet

User Guides

View User Guides for Battery Charge Management

Tools & Software

NamePart # Company Tool / Software Type
BQ24705 Evaluation Module for Multicell Synchronous Notebook ChargerBQ24705EVMTexas 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
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.
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.
BQ24753 Host-Controlled Multi-Chemistry Battery Charger with Low Iq and System Power Selector 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.
BQ24750A Host-controlled Multi-chemistry Battery Charger w/Integrated Sys Power Selector 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.
BQ24704 Low Cost, Host-Controlled Li-Ion and Li-Polymer Battery Charger With Low Iq BATTERY MANAGEMENT-BATTERY CHARGE MANAGEMENT TI customers also evaluated this product.
BQ2031 Switch-mode Lead-Acid Battery Charger with User-Selectable Charge Algorithms BATTERY MANAGEMENT-BATTERY CHARGE MANAGEMENT TI customers also evaluated this product.
BQ24450 Integrated Charge Controller for Lead-Acid Batteries BATTERY MANAGEMENT-BATTERY CHARGE MANAGEMENT TI customers also evaluated this product.
TPS51125 Dual-Synchronous, Step-Down Controller with Out-of-AudioT Operation and 100-mA LDOs NON-ISOLATED SWITCHING DC/DC REGULATORS-DC/DC CONTROLLERS (EXTERNAL SWITCH) TI customers also evaluated this product.
TL431A Adjustable Precision Shunt Regulator VOLTAGE REFERENCE-SHUNT VOLTAGE REFERENCE TI customers also evaluated this product.
BQ27541 Single Cell Li-Ion Battery Fuel Gauge for Battery Pack Integration BATTERY MANAGEMENT-BATTERY FUEL GAUGES TI customers also evaluated this product.
TPS79301 Single Output LDO, 200mA, Adj.(1.2 to 5.5V), High PSRR, Low Noise LINEAR REGULATORS-SINGLE CHANNEL LDO TI customers also evaluated this product.
TPS51124 Dual, Synchronous Step Down Controller for Low Voltage System Power NON-ISOLATED SWITCHING DC/DC REGULATORS-DC/DC CONTROLLERS (EXTERNAL SWITCH) TI customers also evaluated this product.
TLV431A Low Voltage Adjustable Precision Shunt Regulator VOLTAGE REFERENCE-SHUNT VOLTAGE REFERENCE TI customers also evaluated this product.
TPS5430-Q1 Automotive Catalog 3-A Wide-Input-Range Step-Down SWIFT™ Converter DC/DC CONVERTERS (INTEGRATED SWITCH)-STEP-DOWN REGULATORS TI customers also evaluated this product.
TLV1117-33 Single Output LDO, 800mA, Fixed(3.3), Internal Current limit, Thermal Overload Protection LINEAR REGULATORS-STANDARD VOLTAGE REGULATORS TI customers also evaluated this product.
TPS75733 Single Output LDO, 3.0A, Fixed(3.3V), Fast Transient Response, Low Quiescent Current LINEAR REGULATORS-SINGLE CHANNEL LDO TI customers also evaluated this product.
TPS2051B Single, Current-Limited, Power-Distribution Switch PCMCIA AND USB-USB POWER SWITCHES TI customers also evaluated this product.

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