On August 4th 2020, Maxim Integrated officially released the MAX77751 for mass production - a 3.15A USB-C Autonomous Charger for 1-Cell Li+ Batteries.
The MAX77751 is a standalone 3.15A charger with integrated USB Type-C® CC detection and reverse boost capability. The fast-charge current and top-off current thresholds are easily configured with resistors. It operates with an input voltage of 4.5V to 13.7V 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 enables the automatic USB Type C power source detection and the input current limit configuration. To support a variety of legacy USB as well as proprietary adapters, the IC also integrates BC1.2 detection using the D+ and D- pins. The IC runs the CC detection and BC1.2 detection automatically without any software as soon as the USB plug is inserted.
The IC also offers Reverse-Boost capability up to 5.1V, 1.5A, which can be enabled with the ENBST pin. The STAT pin indicates charging status, while the INOKB pin indicates valid input voltage. Charging can be stopped by pulling the ITOPOFF pin low.
The MAX77751 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 MAX77751 released in option with battery termination voltage of 4.35V, other variants with termination voltages from 4.1V to 4.5V to support different Li-ion batteries are to be released soon. The IC comes in a 3mm x 3mm, 0.4mm pitch 24-lead FC2QFN package, making it suitable for low-cost PCB assembly.
Typical application areas for MAX77751 USB-C Charger include:
- Mobile POS Terminal
- Portable Medical Devices
- Wireless Headphones
- GPS Trackers
- Charging Cradles for Wearables
- Power Banks
- Mobile Routers
Customer can evaluate the device using the Evaluation Kit offered by Maxim Integrated. The Kit represents a fully assembled and tested PCB demonstrating MAX77751 product features.Get your Datasheet for the new MAX77751 [PDF]