Monolithic Power Systems’ MP2456B is a highly integrated, flexible, switch-mode battery charger with 3 A boost current. The system power-path management design makes it ideal for single-cell lithium ion or lithium polymer batteries for use in a wide range of applications. The device can operate in both charge mode and boost mode to allow for full system and battery power management. The MP2632B has an integrated VIN-to-SYS pass-through path to pass the input voltage to the system. The pass-through has built-in overvoltage protection (OVP) and overcurrent protection (OCP) and a higher priority over the charging path. When operating in charge mode, the battery voltage is detected automatically and charges the battery in three phases: trickle current, constant current, and constant voltage. Other features include charge termination and auto-recharge, and availablity in a QFN-26 (4 mm x 4 mm) package.

The MP2632B also integrates both input current limit and input voltage regulation to manage the input power and prioritize the system load.  In the absence of an input source, the device switches to boost mode through PB to power SYS from the battery. In boost mode, the OLIM pin programs the output current limit, and the MP2632B turns off at light load automatically. The MP2632B also allows for output short-circuit protection (SCP) to disconnect the battery completely from the load in the event of a short-circuit fault; normal operation resumes once the short-circuit fault is removed. A 4-LED driver is integrated for voltage-based fuel gauge indication. Together with torch-light control, the MP2632B provides an all-in-one solution for power banks and similar applications without an external microcontroller.