19VIN, 3.5/5.5A 1-Cell Li+ Battery Charger with Smart Power Selector and OTG for USBC PD

The MAX77985/MAX77986 is a high-performance high input range 3.5/5.5A fast charger with Smart Power SelectorTM. The IC can operate as a reverse boost without an additional inductor, allowing the battery to share its power through the charging port with voltage programmable from 5V to 12V. The device features fully integrated low-loss power switches to provide a small solution size and high efficiency, even at high input voltage and high charging current. Its high switching frequency allows the use of a smaller sized inductor. Li-ion, Li-polymer, and LiFePO4 battery chemistries are supported. The IC is compatible with USB Power Delivery sources with input current capability up to 5A. It can also provide fast unplug detection of 5V, 9V, and 15V sources for dynamic management of system load. The IC also helps mitigate EMI with the spread spectrum feature. The IC features true load disconnection in reverse boost mode and has an adjustable output current protection limit. The device is highly flexible and programmable through I2C configuration.

The battery charger includes a Smart Power Selector to accommodate a wide range of battery sizes and system loads. The Smart Power Selector allows the system to start up gracefully as soon as an input source is available, even when the battery is deeply discharged (dead battery) or missing. It can be configured so that when power is applied to the charger input, the battery charging can automatically start.

Note: For parts with chip revision 0b001 (PASS1), contact Analog Devices for Rev 0 of the data sheet. This information can be read from the CHIPREVISION (0x01) register.

Applications

* Gaming Devices

* VR Applications

* mPOS

* Tablet PCs

* High-Efficiency Single-Cell Switching Charger

* Up to 5.5A Charging with MAX77986

* Up to 3.5A Charging with MAX77985

* 92% Buck Efficiency at 4A, 12V Input

* 92% Charging Efficiency at 3.5A, 9V Input

* Optimized for High Voltage Input Operation

* Accelerate Charge Time by Monitoring Kelvin Sensing Battery Voltage

* Up to 5.5A Input Current Limit with AICL (MAX77986)

* Up to 3.5A Input Current Limit with AICL (MAX77985)

* +28V Absolute Maximum Input Voltage Rating

* 4.7V to 19V Input Operating Voltage Range

* Reverse Boost with Programmable Output Voltage Options up to 12V

* Up to 18W for MAX77986

* Up to 12W for MAX77985

* Safety

* Battery Temperature Sensing and Charge Safety Timer

* JEITA Guideline Compliant

* Thermal Regulation and Thermal Shutdown

* System Voltage OVLO/UVLO