General Description
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.

Benefits and Features
• Stand-Alone AccuCharge™ Buck Charger
• 13.7V Input Operating Voltage, up to 16V
protection
• I2C or Resistor Configured Fast Charge Current
100mA to 3150mA
• I2C or Resistor Configured Charge Termination
Voltage 3.4V to 4.66V
• I2C Programmable JEITA zones – 9 Automatic
Temperature Charge Control Region
• Prequal and Step-Charging Options
• Fuel Gauge-Assisted Charge Termination
• 6A Peak Discharge Current
• OTG/Reverse Boost up to 5.1V, 1.5A
• Adaptive Input Current Limit (AICL)
• ModelGauge m5 EZ Algorithm
• Percent, Capacity, Age
• Cycle+™ Age Forecast
• Precision Measurement Without Calibration
• Current, Voltage, Time, Cycles
• Die Temperature and Thermistors
• Integrated USB Detection
• CC Detection for USB Type-C
• BC1.2 Detection for Legacy SDP, DCP, and CDP
• Automatic Input Current Limit Configuration
• OCV Keep-Out Region for Special Chemistry Cell

Applications
• Mobile Point-of-Sale Devices
• Portable speakers
• Wireless Headset Charging Cases
• Power Banks
• Mobile Hotspots
• AR/VR Devices
• E-Readers and Tablets