![]() R1 and R 2 can be calculated with Equation (1): To charge a lead-acid battery, there is a specific regulated battery voltage that can be set using resistor dividers (R 1 and R 2). Each cells has a regulated battery voltage (3.6V, 4.15V, 4.2V, or 4.35V). The MP2659 is designed for 3-cell to 6-cell series Li-ion and Li-polymer batteries. When an input source is present, Q BATT turns off, and the system’s power is supplied by the input source from Q IN. When there is no input source, Q BATT turns on and transfers energy from the battery to the system. OR-selection power path management can be realized with two P-channel MOSFETs and other components (e.g. With the addition of external components, the complete charging function with power path management can be implemented. The circuit’s power stage uses one inductor (L 1) and three capacitors (C IN, C PMID, and C BATT). Table 2: System Specifications 3 Design 3.1 Design Methodįigure 2 shows an application circuit to charge lead-acid batteries with OR-selection power path management. Table 1: System Specifications 2.3 System Specifications ParameterĦ80kHz or 350kHz (under nominal conditions) This reference design is based on the following MPS solution: MPS Integrated Circuitģ6V, standalone switching charger with integrated MOSFETs, 3-cell to 6-cell series battery pack To adjust the regulation voltage of the lead-acid batteries, adjust the resistance of the voltage dividers.įigure 1: Block Diagram 2.2 Related Solutions This application has a 40W output capability and an input voltage up to 36V. 45V Maximum Sustainable Voltage When Not Switchingįigure 1 shows a block diagram for a highly integrated switching charger for lead-acid batteries.The solution uses the MP2659, a highly integrated switching charger designed for portable devices with 3-cell to 6-cell series Li-ion or Li-polymer battery packs. This reference design showcases a lead-acid battery charging solution. However, there are few chips on the market that are designed specifically for applications that charge lead-acid batteries. Lead-acid batteries are widely used in battery-powered devices due to their advantages, such as a stable voltage, low price, simple maintenance, and high reliability. Lattice Semiconductor Reference Designs.Switching Converters and Controllers AECQ Grade.BLDC Pre Drivers and Integrated Solutions.Digital Isolators with Integrated Power.Multi Phase Controllers & Intelli-Phase.
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