BQ25731

• No battery MOSFET for saving cost and high efficiency
• 400-kHz/800-kHz programmable switching frequency for high efficiency/high power density
• Buck-boost charger for USB-C Power Delivery (PD) interface platform
  • 3.5-V to 26-V input range to charge 1- to 5-cellbattery
  • Charge current up to 16.2 A/8.1 A with 128-mA/64-mA resolution based on 5-mΩ/10-mΩ sensing resistor
  • Input current limit up to 10 A/6.35 A with 100-mA/50-mA resolution based on 5-mΩ/10-mΩ sensing resistor
  • Support USB 2.0, USB 3.0, USB 3.1 and USB power delivery input current setting
  • Input Current Optimizer (ICO) to extract max input power without overloading the adapter
  • Seamless transition between buck, buck-boost, and boost operations
  • Input current and voltage regulation (IINDPM and VINDPM) against source overload
• TI patented switching frequency dithering pattern for meeting IEC-CISPR 32 EMI specification
• TI patented Pass Through Mode (PTM) for system power efficiency improvement and battery fast charging achieving 99% efficiency.
• Input and battery current monitor through dedicated pins
• Integrated 8-bit ADC to monitor voltage, current and power
• Support independent comparator logic with dedicated pins
• Power up USB port from battery (USB OTG)
  • 3-V to 24-V OTG with 8-mV resolution
  • Output current limit up to 12.7 A/6.35 A with 100-mA/50-mA resolution based on 5-mΩ/10-mΩ sensing resistor
• I²C host control interface for flexible system configuration
• High accuracy for the regulation and monitor
  • ±0.5% Charge voltage regulation
  • ±3% Charge current regulation
  • ±2.5% Input current regulation
  • ±2% Input/charge current monitor
• Safety
  • Thermal shutdown
  • Input, system, battery overvoltage protection
  • Input, MOSFET, inductor overcurrent protection
• Package: 32-Pin 4.0 mm × 4.0 mm WQFN

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The BQ25731 is a synchronous buck-boost battery charge controller to charge a 1- to 5-cell battery from a wide range of input sources including USB adapter, high voltage USB-C Power Delivery (PD) sources, and traditional adapters. It offers a low component count, high efficiency solution for space constrained, 1- to 5-cell battery charging applications.

During power up, the charger sets the converter to a buck, boost, or buck-boost configuration based on the input source and battery conditions. The charger seamlessly transits between the buck, boost, and buck-boost operation modes without host control.

During power up, the charger sets the converter to a buck, boost, or buck-boost configuration based on the input source and battery conditions. The charger seamlessly transits between the buck, boost, and buck-boost operation modes without host control.

In the absence of an input source, the BQ25731 supports the USB On-the-Go (OTG) function from a 1- to 5-cell battery to generate an adjustable 3-V to 24-V output on VBUS with 8-mV resolution. The OTG output voltage transition slew rate can be configured to comply with the USB-PD 3.0 PPS specification.

The latest version of the USB-C PD specification includes Fast Role Swap (FRS) to ensure power role swapping occurs in a timely fashion so that the device(s) connected to the dock can avoid experiencing momentary power loss or glitching. This device integrates FRS in compliance with the PD specification.

TI patented switching frequency dithering pattern can significantly reduce EMI noise over the whole conductive EMI frequency range (150 kHz ~ 30 MHz). Multiple dithering scale options are available to provide flexibility for different applications to simplify EMI noise filter design.

The charger can be operated in the TI patented pass through (PTM) mode to improve efficiency over the full load range. In PTM, input power is directly passed through the charger to the system. Switching losses of the MOSFETs and inductor core loss can be saved for high efficiency operation.

The BQ25731 is available in a 32-pin 4mm × 4mm WQFN package.