The MAX77972 is an autonomous integrated FET
charger with integrated fuel gauge, Universal Serial Bus
(USB) Type-C and BC1.2 detection. The MAX77972
supports 4.5V to 13.7V inputs and up to 3.15A of
charging current. Charge current and voltage are I2C
and pin-configurable using resistors. The IC supports
USB On-The-Go (OTG) reverse boost and includes a
Smart Power Selector™ (SPS), which is best for using
limited adapter and battery power.
The fuel gauge uses the ModelGauge™ m5 algorithm,
which provides industry-leading accuracy by combining
the short-term accuracy and linearity of a coulomb
counter with the long-term stability of a voltage-based
fuel gauge. ModelGauge m5 automatically compensates
for cell aging, temperature, and discharge rate and
provides accurate state-of-charge (SOC) over a wide
range of operating conditions.
Charging is coordinated with the fuel gauge to provide
9-temperature-region JEITA charge control as well as
step-charging. Other protection features include junction
thermal regulation, over/under voltage protection, and
short circuit protection.
The USB Type-C Configuration Channel (CC) detection
pins on the MAX77972 enable automatic USB Type-C
power source detection and input current limit
configuration. To support a variety of legacy USB types
as well as proprietary adapters, the IC also integrates
BC1.2 detection using the D+ and D- pins. The IC runs
the CC pin and BC1.2 detection automatically as soon
as a USB plug is inserted without any software control.
The IC is available in a lead-free 3.208mm x 3.258mm
36-bump 0.5mm pitch Wafer-level packaging (WLP)
package.
