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BQ24704

ACTIVE

Host-Controlled Multi-Chemistry Battery Charger with Low Input Power Detect and low Iq

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Data sheet

BQ24704

ACTIVE
Data sheet Order now

Product details

Number of series cells 2, 3, 4 Charge current (max) (A) 10 Vin (max) (V) 24 Cell chemistry Li-Ion/Li-Polymer Battery charge voltage (min) (V) 8 Battery charge voltage (max) (V) 18 Absolute max Vin (max) (V) 30 Control topology Switch-Mode Buck Control interface Standalone (RC-Settable) Features Power Path Vin (min) (V) 8 Rating Catalog Operating temperature range (°C) -40 to 125
Number of series cells 2, 3, 4 Charge current (max) (A) 10 Vin (max) (V) 24 Cell chemistry Li-Ion/Li-Polymer Battery charge voltage (min) (V) 8 Battery charge voltage (max) (V) 18 Absolute max Vin (max) (V) 30 Control topology Switch-Mode Buck Control interface Standalone (RC-Settable) Features Power Path Vin (min) (V) 8 Rating Catalog Operating temperature range (°C) -40 to 125
VQFN (RGE) 24 16 mm² 4 x 4
  • NMOS-NMOS Synchronous Buck Converter with 300 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
    • Dynamic Power Management (DPM) with Status Indicator
    • Charger Overcurrent Protection
    • Battery Overvoltage Protection
    • Thermal Shutdown
  • Supports Two, Three, or Four Li+ Cells
  • 8 — 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
    • AC/DC Adapter Present with Programmable Voltage Threshold
    • DPM Loop Active (DPMDET)
    • Current Drawn from Input Source
  • Charge Enable
  • 24-pin, 4x4-mm QFN Package
  • Energy Star Low Iq
    • < 10 µA Off-state Discharge Current
    • < 1.5 mA Off-state Input Quiescent Current
  • APPLICATIONS
    • Notebook and Netbook Computers
    • Portable Data-Capture Terminals
    • Portable Printers
    • Medical Diagnostics Equipment
    • Battery Bay Chargers
    • Battery Back-Up Systems

PowerPad is a trademark of Texas Instruments.
  • NMOS-NMOS Synchronous Buck Converter with 300 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
    • Dynamic Power Management (DPM) with Status Indicator
    • Charger Overcurrent Protection
    • Battery Overvoltage Protection
    • Thermal Shutdown
  • Supports Two, Three, or Four Li+ Cells
  • 8 — 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
    • AC/DC Adapter Present with Programmable Voltage Threshold
    • DPM Loop Active (DPMDET)
    • Current Drawn from Input Source
  • Charge Enable
  • 24-pin, 4x4-mm QFN Package
  • Energy Star Low Iq
    • < 10 µA Off-state Discharge Current
    • < 1.5 mA Off-state Input Quiescent Current
  • APPLICATIONS
    • Notebook and Netbook Computers
    • Portable Data-Capture Terminals
    • Portable Printers
    • Medical Diagnostics Equipment
    • Battery Bay Chargers
    • Battery Back-Up Systems

PowerPad is a trademark of Texas Instruments.

The bq24704 is a high-efficiency, synchronous battery charger with integrated compensation offering low component count for space-limited Li-Ion and Li-Polymer 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 bq24704 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 bq24704 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. A highly-accurate current-sense amplifier enables precise measurement of input current from the AC adapter to monitor the overall system power.

The bq24704 is a high-efficiency, synchronous battery charger with integrated compensation offering low component count for space-limited Li-Ion and Li-Polymer 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 bq24704 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 bq24704 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. A highly-accurate current-sense amplifier enables precise measurement of input current from the AC adapter to monitor the overall system power.
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* Data sheet Host-Controlled Multi-Chemistry Battery Charger With Low Input Power Detect.. datasheet 18 May 2009
Analog Design Journal Q4 2009 Issue Analog Applications Journal 24 Sep 2018
Application note How to Review a Multicell Switching Charger Schematic 21 Sep 2011

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