1 Features
• 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

2 Applications
• Smartphone, Tablet, Non-military Drone
• Chromebook, Notebook

3 Description
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 precharge
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 Rdson 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.