MAX17115ETJ+

Working Principle

The MAX17115ETJ+ is a complete low-cost, high-performance single-cell linear charger that performs all necessary control and safety functions required for safe charging. The integrated linear charger monitors the battery voltage, current, temperature and capacity for safe charging. The monitoring and charging are integrated in the chip without external programming logic, and the system can be operated with a regular 5V power supply.

The charger has two programmable operating modes: constant voltage (CV) and constant current (CC). The battery is charging in the constant voltage mode until the charge current is below the programmed current limit (CC). Then it switches to the constant current mode until the programmed battery voltage limit is reached, after which the charge termination is considered complete. The battery is protected from overcharging (battery depleted) or over-discharging (battery missing) by two adjustable cut-off levels. The chip also integrates an exposure timer, enabling the user to set the exposure time to minimize exposure to high temperature that can be caused by long exposure to the sun. The chip has a wide input voltage range from 2.5V to 7V, allowing flexibility for various power sources such as USB, DC adapter and solar panel.