BQ25980

• 98.6% peak efficiency switched cap parallel charger supporting 2-cell battery and 8-A fast charge
• Patent pending dual phase switched cap architecture optimized for highest efficiency
  • Input voltage is 2x battery voltage (7.0V to 9.54V)
  • Output current is 2x of input current (up to 4.75A)
  • Reduces power loss across input cable
• Integrated 7-A bypass mode fast charge
  • 13mΩ charging path resistance for high current operation
• Dual-input power mux controller for source selection

• Support wide range of input voltage

  • Up to 22-V operational input voltage

  • Maximum 40-V input voltage with optional external ACFET and 28-V without external ACFET

• Parallel charging with synchronized dual BQ25980 operations for up-to 12-A charging current

• Integrated programmable protection features for safe operation
  • Input over-voltage protection (BUSOVP) and battery over-voltage protection (BATOVP)
  • Input over-current protection (BUSOCP) and battery over-current protection (BATOCP)
  • Output over-voltage protection (VOUTOVP)
  • Input under-current protection (BUSUCP) and input reverse-current protection (BUSRCP) to detect adapter unplug and prevent boost-back
  • Input short-circuit protection (BUSSCP)
  • Battery and connector temperature monitoring (TSBAT_FLT and TSBUS_FLT)
  • Junction over-temperature protection (TDIE_FLT)
  • Optional input over-voltage protection with external ACFET up to 40V
• Programmable settings for system optimization
  • Interrupts and interrupt masks
  • ADC readings and configuration
• Integrated 16-bit ADC for voltage, current and temperature monitoring

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The BQ25980 is a 98.6% peak efficiency, 8-A battery charging solution using dual-phase switched cap architecture for 2-cell Li-ion battery. The switched cap architecture allows the cable current to be half the charging current, reducing the cable power loss and limiting temperature rise. The dual-phase architecture increases charging efficiency and reduces the input and output cap requirements. When used with a main charger such as BQ25790, the system enables the fast charging at the very low power loss from pre-charge through constant current (CC), constant voltage (CV), and termination.

The BQ25980 also supports 7-A bypass mode charge (previously called battery switch charge) through internal MOSFETs. The R_dson in bypass mode charging path is less than 13mΩ for high current operation. The integrated bypass mode allows backward compatibility of 10-V fast charging adapter to charge 2-cell battery.

The device supports dual input configuration through integrated mux control and driver for external N-FETs. It also allows single input with no external N-FET or single N-FET.

The device integrates all the necessary protection features to support safe charging, including input over-voltage and over-current protection, output over-voltage and over-current protection, input under-current and reverse-current protection, input short circuit protection, temperature sensing for the battery and cable, and junction over-temperature protection in both switched cap and bypass mode.

The device includes a 16-bit analog-to-digital converter (ADC) to provide VAC voltage, bus voltage, bus current, output voltage, battery voltage, battery current, input connector temperature, battery temperature, junction temperature, and other calculated measurements needed to manage the charging of the battery from the adapter, or wireless input, or power bank.