23V 3.2A Buck-Boost Charger for 2S/3S Li-Ion Batteries and USB Power Delivery

The MAX77963 is a high-performance wide-input 3.2A buck-boost charger with a Smart Power Selector™ and operates as a reverse buck without an additional inductor, allowing the IC to power USB On-the-Go (OTG) accessories. The device integrates low-loss power switches and provides a small solution size, high efficiency, low heat, and fast battery charging. The reverse buck has a true-load disconnect and is protected by an adjustable output current limit. The device is highly flexible and programmable through I2C configuration or autonomously through resistor 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 when an input source is available even when the battery is deeply discharged (dead battery) or missing. For battery safety/authentication reasons, the IC can be configured to keep charging disabled and allow the DC-DC to switch and regulate the SYS voltage. The system processor can later enable charging using I2C commands as appropriate. Alternatively, the MAX77963 can be configured to automatically start charging.

APPLICATIONS

* Wide-Input Voltage Range for USB Power Delivery Applications

* 2- and 3-Cell Battery Powered Devices

* Smartphones, Tablets, and 2-in-1 Laptops

* Medical Devices, Health and Fitness Monitors

* Digital Still, Video, and Action Cameras

* Handheld Computers and Terminals

* Handheld Radios

* Power Tools

* Drones

* Battery Backups

* Wireless Speakers

* 3.5V to 23V Input Operating Range, 30VDC Withstand Voltage

* 96% Peak Efficiency for 2S Battery at 9VIN/8.4VOUT/1.5AOUT

* 96% Peak Efficiency for 3S Battery at 15VIN/12.6VOUT/2AOUT

* Reverse Leakage Protection

* 50mA to 3.15A Programmable Input Current Limit

* 50mA to 3.2A Programmable Constant Current Charge

* 12-Bit ADC for Monitoring Voltage, Current, and Temperature

* Remote Differential Voltage Sensing

* 600kHz, 1.2MHz, or 1.8MHz Switching Frequency Options

* Spread-Spectrum Modulation to Reduce EMI Emissions at the Switching Frequency