3.15A USB Type-C Autonomous Charger with JEITA for 1-Cell Li-ion/LiFePO4 Batteries

The MAX77787 is a standalone, 3.15A charger with integrated USB Type-C® CC detection and reverse-boost capability. The fast-charge current and termination voltage is easily configured with resistors. The IC operates with an input voltage of 4.5V to 13.4V and has a maximum input current limit of 3A. The IC also implements the adaptive input current limit (AICL) function that regulates the input voltage by reducing input current to prevent the voltage of a weak adapter from collapsing or folding back.

The USB Type-C Configuration Channel (CC) detection pins on the IC enable automatic USB Type-C power source detection and input current limit configuration without any software control as soon as the USB plug is inserted. The IC also integrates BC1.2 and proprietary adapter detection using the D+ and D- pins.

The IC offers reverse-boost capability up to 5.1V, 1.5A, that can be enabled with the ENBST pin, also BYP reverse-boost that can be enabled with the ENBST and STBY pin combination. The STAT pin indicates charging status, while the INOKB pin indicates valid input voltage. Charging can be stopped by pulling the CHGENB pin low.

The IC is equipped with a Smart Power Selector™ and a battery true-disconnect FET to control the charging and discharging of the battery or isolate the battery in case of a fault. The IC supports Li-ion batteries with JEITA compliance. It also has another option that supports LiFePO4 batteries with non-JEITA compliance. The IC comes in a 2.758mm x 2.758mm, 0.4mm pitch, 6 x 6 wafer-level package (WLP) making it suitable for low-cost PCB assembly.

Applications

* Mobile Point-of-Sale (mPOS) Terminals * Portable Medical Devices * Wireless Headphones * GPS Trackers * Charging Cradles for Wearable Devices * Power Banks * Mobile Routers

* Up to 16V Protection * 13.4V Maximum Input Operating Voltage * 3.15A Maximum Charging Current * 6A Discharge Current Protection

* No Firmware or Communication Required * Integrated CC Detection for USB Type-C * Integrated BC1.2 Detection for Legacy SDP, DCP, CDP, and DCD Timeout * Integrated USB Detection for Common Proprietary Charger Types * Automatic Input Current Limit Configuration * Input Voltage Regulation with Adaptive Input Current Limit (AICL)

* 5.1V, 1.5A OTG Mode and BYP Reverse Boost * Safety

* Charge Safety Timer * JEITA Compliance with NTC Thermistor Monitor * Thermal Shutdown

* Pin Control of all Functions

* Resistor Configurable Fast-Charge Current/Input Current Limit/Termination Voltage * ENBST Pin to Enable and Disable Reverse Boost * STAT Pin to Indicate Charging Status * INOKB Pin to Indicate Input Power-OK * CHGENB Pin to Enable and Disable Charging * STBY Pin to Support Suspend Mode * THM Pin to Monitor Thermistor

* Integrated Power Path * Integrated Battery True-Disconnect FET * 2.758mm x 2.758mm, 6 x 6 WLP