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  • MCP19111 Based Battery Charger

  • Created: May 02, 2017

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Summary

This schematic design is a battery charger that can be used to charge batteries of various chemistries. The design is compatible to batteries such as NiMH up to seven cells, Li-Ion up to four cells, and VRLA batteries up to six cells. The design is based on the MCP19111 enhanced power analog controller from Microchip.


The MCP19111 chip is a highly integrated, mixed-signal, Pulse-Width Modulation (PWM) current mode controller with an integrated microcontroller core for synchronous DC/DC step-down applications. This device is configured to regulate the amount of charge current and the type of charging while simultaneously reading the state of the battery to change between operation modes for optimized charge profiles. Almost all parameters used for charging can be programmed using the integrated microcontroller core. The board can run in Rapid Charge Current mode for NiMH batteries, as well as Constant Current/Constant Voltage mode for Li-Ion batteries. The MCP19111 Battery Charger Evaluation Board also has two charge configurations for VRLA batteries, which can be charged in both Rapid Charge and Constant Current modes. The MCP19111 accepts a voltage range of up to 32V. The battery charger board also provides several status and fault indications for various states of the board. Moreover, the board detects the presence or the removal of a battery pack.


The board has the capability to connect to both the PICkit™ 3 In-Circuit Debugger/Programmer for reprogramming and the PICkit Serial Analyzer to operate in conjunction with the GUI. Normally, the PICkit Serial Analyzer is used to configure the charge cycle and to change parameters.

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