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Texas Instruments bq25703A Buck-Boost Charge Controllers

Texas Instruments bq25703A NVDC I2C Battery Buck-Boost Charge Controllers with System Power Monitor and Processor provide a low component count and high-efficiency solution for battery charging applications. The device does not drop below the system minimum voltage and is regulated at battery voltage enabled by the NVDC-1 configuration. Battery features include system operation after battery removal or discharge, as well as supplement mode applying when the load power exceeds input source rating preventing overloading. 

Input sources for battery charging include a USB adapter, high voltage USB PD sources, and traditional adapters. Based on the input source and battery conditions during power-up, the charger sets the converter to buck, boost, or buck-boost configuration. The bq25703A supports On-the-Go (OTG) function from 1- to the 4-cell battery to generate 4.48V to 20.8V on VBUS in the absence of an input source. The charger regulates the output voltage and output current during OTG mode. The device monitors adapter current, battery current, and system power.

Features

  • Charge 1 to 4-cell battery from wide range of input sources
    • 3.5V to 24V Input operating voltage
    • Supports USB2.0, USB 3.0, USB 3.1 (Type C), and USB_PD input current settings
    • Seamless transition between buck and boost operation
    • Input current and voltage regulation (IDPM and VDPM) against source overload
  • Power/current monitor for CPU throttling
    • Comprehensive PROCHOT profile, IMVP8 compliant
    • Input and battery current monitor
    • System power monitor, IMVP8 compliant
  • Narrow-VDC (NVDC) power path management
    • Instant-on with no battery or deeply discharged battery
    • Battery supplements system when adapter is fully-loaded
    • Ideal diode operation in supplement mode
  • Power up USB port from battery (USB OTG)
    • Output 4.48V to 20.8V compatible with USB PD
    • Output current limit up to 6.35A
  • 800kHz or 1.2MHz Programmable switching frequency for 1µH to 2.2µH low profile inductor
  • Host control interface for flexible system configuration
    • I2C (bq25703A) Port for optimal system performance and status reporting
    • Hardware pin to set input current limit without EC control
  • High accuracy regulation and monitor
    • ±0.5% Charge voltage regulation
    • ±2% Input/charge current regulation
    • ±2% Input/charge current monitor
    • ±5% Power monitor
  • Safety
    • Thermal shutdown
    • Input, system, battery overvoltage protection
    • MOSFET Inductor overcurrent protection
  • Low battery quiescent current
  • Input Current Optimizer (ICO) to extract max input power
  • Charge any battery chemistry: Li+, LiFePO4, NiCd, NiMH, lead-acid
  • 32-Pin 4×4 WQFN Package

Applications

  • Drones, BLUETOOTH® speakers, IP cameras, detachable, and tablet PCs and power bank
  • Industrial and medical equipment
  • Portable equipment With rechargeable batteries

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Publicado: 2017-11-20 | Actualizado: 2022-07-11