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