MAX77751

3.15A USB-C Autonomous Charger

for 1-Cell Li+ Batteries

www.maximintegrated.com

Maxim Integrated | 17

Detailed Description

The MAX77751 is a highly integrated USB Type-C Charger with autonomous configuration. The MAX77751 can operate

at an input range from 4.5V to 13.7V to support a 5V, 9V, and 12V AC adapter and USB input. It is capable of supplying

a fast-charge current up to 3.15A and the maximum input current limit is 3.0A.

The MAX77751 can run BC1.2 and USB Type-C CC detection when USB input is plugged in and can configure the input

source to the maximum power option and the charger input current limit to maximum power.

The fast-charge current and top-off current threshold can be programmed with an external resistor. The input voltage

regulation feature with adaptive input current limit (AICL) allows charging to continue even with a weak adapter by

preventing it from collapsing or folding back.

The power path design provides system power even when the battery is fully discharged, and it supplements current from

the battery and CHGIN input automatically when the system demands higher current.

Switching Mode Charger

Features

• Complete Li-ion/Li-Polymer Switching Charger

• Prequalification, Constant Current, Constant Voltage Charging

• 55mA Precharge, 300mA Trickle Charge Current

• 500mA to 3.15A Resistor-Adjustable Fast-Charge Current

• 100mA to 350mA Resistor-Adjustable Charge Termination Threshold

• 4.1V to 4.5V Battery Regulation Voltage (see the Ordering Information section)

• Smart Power Selector

• Optimally Distributes Power Between the Charge Adapter, System, and Battery

• When Powered by a Charge Adapter, the Main Battery Can Provide Supplemental Current to the System

• The Charge Adapter Can Support the System Without a Battery

• 20mΩ BATT to SYS Switch with up to 4.5A Continuous Discharge Capability

• No External MOSFETs Required

• 4.5V to 13.7V Input Operating Voltage

• Reverse Leakage Protection Prevents the Battery Current Leaking to the Input

• Automatic Detection of USB Type-C and BC1.2 Adapters

• 500mA to 3A Automatic Input Current Limit Selection After USB Charger Type Detection

• Supports Non-USB Sources

• 6-Hour Charge Safety Timer

• Die Temperature Monitor with Thermal Foldback Loop (130°C Threshold)

• Input Voltage Regulation Allows Operation from High-Impedance Sources (AICL)

• Short Circuit Protection

• BATT to SYS Overcurrent Threshold: 6A

• SYS Short-to-Ground