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Product details

Parameters

Number of series cells 2, 3, 4 Charge current (Max) (A) 10 Operating Vin (Max) (V) 24 Cell chemistry Lead Acid, Li-Ion/Li-Polymer, Lithium Phosphate/LiFePO4, NiCd, NiMH Battery charge voltage (Min) (V) 1.024 Battery charge voltage (Max) (V) 19.2 Absolute Vin (safety rating) (Max) ((V)) 30 Control topology Switch-Mode Buck Control interface SMBus Features IC thermal regulation, IINDPM (Input current limit), Power Path Operating Vin (Min) (V) 7 Rating Catalog open-in-new Find other Battery charger ICs

Package | Pins | Size

VQFN (RUV) 34 25 mm² 3.5 x 7 open-in-new Find other Battery charger ICs

Features

  • Integrated Power MOSFETs, NMOS-NMOS,
    Synchronous Buck Converter
  • >95% Efficiency
  • Frequency 700kHz Allows Smaller Inductor (5 mm
    × 5 mm)
  • Thermal Regulation Loop for Safety, Limit TJ =
    120°C
  • Adaptive 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
    • Integrated Power MOSFETs
    • Input Current Comparator
    • Internal Soft-Start
  • Safety
    • Thermal Regulation Loop and Thermal
      Shutdown
    • Dynamic Power Management (DPM)
    • Power FETs Over Current Protection
  • 7 V–24 V AC/DC-Adapter Operating Range
  • Simplified SMBus Control
    • Charge Voltage DAC (1.024 V–19.2 V)
    • Charge Current DAC (128 mA–8.064 A)
    • Adapter Current Limit DPM DAC (256
      mA–11.008 A)
  • Status and Monitoring Outputs
    • AC/DC Adapter Present With Adjustable
      Voltage Threshold
    • Input Current Comparator, With Adjustable
      Threshold and Hysteresis
    • Current Sense Amplifier for Current Drawn
      From Input Source
  • Charge Any Battery Chemistry: Li+, LiFePO4,
    NiCd, NiMH, Lead Acid (2, 3, and 4 Li-Ion Cells)
  • Charge Enable Pin (CE)
  • Energy Star Low Iq
    • < 10-µA Battery Current with Adapter
      Removed
    • < 1 mA Input DCINA Current When Adapter
      Present and Charge Disabled
  • 34-pin, 3.50 mm × 7.00 mm QFN Package
  • APPLICATIONS
    • Notebook and Ultra-Mobile Computers
    • Portable Data-Capture Terminals
    • Portable Printers
    • Medical Diagnostics Equipment
    • Battery Bay Chargers
    • Battery Back-up Systems

All other trademarks are the property of their respective owners

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Description

The bq24765 is a high-efficiency, synchronous battery charger with two integrated 30-mΩ NMOS power MOSFETs, and an integrated input current comparator, offering low component count for space-constraint, multi-chemistry battery charging applications. Input current, charge current, and charge voltage DACs allow for very high regulation accuracies that can be easily programmed by the system power management micro-controller using SMBus. The bq24765 has switching frequency of 700 kHz. The bq24765 charges 2, 3, or 4 series Li+ cells, and is available in a 34-pin, 3.50 mm × 7.00 mm VQFN package.

The bq24765 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 adaptor when supplying the load and the battery charger simultaneously. A high-accuracy current sense amplifier enables accurate measurement of input current from the AC adapter, allowing monitoring the overall system power. If the adapter current is above the programmed low-power threshold, a signal is sent to host so that the system optimizes its power performance according to what is available from the adapter. An integrated comparator allows monitoring the input current through the current sense amplifier, and indicating when the input current exceeds a programmable threshold limit. The bq24765 features a thermal regulation loop to reduce battery charge current when the Tj limit is reached. This feature protects internal power FETs from overheating when charging with high current.

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Technical documentation

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Type Title Date
* Data sheet bq24765 SMBus-Controlled Multi-Chemistry Battery Charger With Integrated Power MOSFETs datasheet (Rev. A) Nov. 25, 2015
Technical article When to use rechargeable batteries in small battery applications Oct. 01, 2019
Technical article Should I use a linear charger or a switching charger? Oct. 31, 2015
Technical article Summertime and the livin' is easy Jun. 20, 2014
User guide bq24765 (HPA349) user's guide (Rev. A) Oct. 04, 2013
Application note How to Review a Multicell Switching Charger Schematic Sep. 21, 2011

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARD Download
document-generic User guide
199
Description

The bq24765 evaluation module is a complete charger module for evaluating a multi cell integrated power MOSFETs synchronous notebook charge using the bq24765 devices. It is designed to deliver up to 8A of charge current to Li-Ion or Li-Pol applications. The charge current is programmable by SBS-like (...)

Features
  • Evaluation Module For BQ24765
  • High Efficiency Integrated Power MOSFET Synchronous Buck Charger
  • User-selectable 1-cell, 2-cell, 3-cell or 4-cell Li-ion Battery Voltage
  • Programmable Battery Voltage, Charge Current, and AC Adapter Current via SBS-Like SMBus Interface
  • AC Adapter Operating Range 18 V–22 V
  • LED (...)

Software development

SUPPORT SOFTWARE Download
SLVC309.ZIP (2292 KB)

CAD/CAE symbols

Package Pins Download
VQFN (RUV) 34 View options

Ordering & quality

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  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

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