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Battery backup systems used in applications such as solar-powered outdoor cameras, lighting, and small cell systems like 4G/5G access points need multi-cell battery chargers for power. The traditional solution for multi-cell battery chargers is composed of several discrete power MOSFETs and multiple auxiliary components. In traditional discrete solutions, designers need at least two power MOSFETs for the charger’s DC/DC converter, one power MOSFET to prevent battery power from flowing back to the input, and another MOSFET if power path functionality from the battery is needed. Control loops that include sensing circuits, compensating circuits, PWM generators, and drivers are essential. Furthermore, the system needs circuits that offer protection, indications for the input source or any changes in operating conditions, and other functions. These discrete components result in a complicated design process, lack of flexible programmability, large board size, and high BOM costs. The MP2759 is a highly integrated switching charger designed for charging applications with 1-cell to 6-cell series Li-ion, Li-polymer, and LiFePO4 battery packs. This IC integrates three power MOSFETs — plus programmable analog control circuits — into a 3mmx3mm package, and can operate reliably and safely with very few external components.
The MP2759 switches to battery power if the power supply goes away, and it supports up to 40V protection on the input, compared to only 28V in many other solutions. Additional features include:
Monolithic Power Systems provides small, highly energy efficient, easy-to-use power solutions for systems found in industrial applications, telecom infrastructures, cloud computing, automotive, and consumer applications.