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Texas Instruments bq25700A Buck-Boost Charge Controller

Texas Instruments bq25700A Buck-Boost Charge Controller offers a low component count, high-efficiency solution for space-constraint, multi-chemistry battery charging applications. The NVDC-1 configuration allows the system to be regulated at battery voltage, not drop below the minimum voltage. The system keeps operating even when the battery is completely discharged or removed. When load power exceeds the input source rating, the battery goes into supplement mode, preventing the input source from overloading. The bq25700A charges the battery from various input sources, including USB adapters, high voltage USB PD sources, and standard adapters. During power-up, the charger sets the converter to buck, boost, or buck-boost configuration based on the input source and battery conditions. The charger automatically transits among buck, boost, and buck-boost configurations without host control.

Features

  • Charge 1- to 4-Cell battery from a 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 an adapter is fully-loaded
    • Ideal diode operation in supplement mode
  • Power-Up USB port from the 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:
    • SMBus (bq25700A) port for optimal system performance and status reporting
    • Hardware pin to set the 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, and battery overvoltage protection
    • MOSFET inductor overcurrent protection
  • Low battery Quiescent current
  • Input Current Optimizer (ICO) to extract maximum input power
  • Charge any battery chemistry: Li+, LiFePO4, NiCd, NiMH, Lead-acid
  • 32-Pin 4×4 WQFN package

Applications

  • Ultra-books, notebooks, detachable, and tablet PCs and power bank
  • Industrial and medical equipment
  • Portable equipment with rechargeable batteries

Associated Product

Texas Instruments bq2570xAEVM-732 Evaluation Modules (EVMs)

Evaluates a SMBus controlled buck-boost charge using bq2570x, a NVDC buck-boost charge controllers.

Learn Moreabout Texas Instruments bq2570xAEVM-732 Evaluation Modules (EVMs) View Productsrelated to Texas Instruments bq2570xAEVM-732 Evaluation Modules (EVMs)

Application Diagram

Application Circuit Diagram - Texas Instruments bq25700A Buck-Boost Charge Controller
Published: 2017-10-11 | Updated: 2022-06-28