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bq24704 - Multi-Cell Synchronous Switch-mode Battery Charger


Low Cost, Host-Controlled Li-Ion and Li-Polymer Battery Charger With Low Iq - Now Available at Digi-Key

Texas Instruments' 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.    bq24704 Datasheet
Texas Instruments bq24704 - Multi-Cell Synchronous Switch-mode Battery Charger
  • Overview
  • Features & Applications
  • Diagram
  • Buy Now


Overview

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.


Features
  • Fixed 300-kHz NMOS-NMOS sync. buck converter
  • 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
  • AC Adapter Operating Range 5–24 V
  • <10-µA off-state discharge current, <1.5mA input Iq
  • 24-pin 4x4 thin QFN package

Applications
  • Notebook Computers
  • Portable Data-Capture
  • Portable Printers
  • Medical Equipments
  • Battery Bay Chargers
  • Battery Back-up Systems
RoHS Compliant


Block Diagram

Texas Instruments bq24704 Block Diagram


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 Available in Tape & Reel (-2-ND), Cut Tape (-1-ND), and custom Digi-Reel® (-6-ND)
Texas Instruments
Part Number
Digi-Key
Part Number
Battery Type
Voltage - Supply
Package/Case
bq24704RGET
Li-Ion, Li-Pol
5V ~ 24V
24-VQFN