MCP73855EV

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The MCP73855EV is a complete lithium-ion battery charging solution composed of an integrated circuit (IC) and required external components. It can be used for battery charging in power sources such as portable electronics, power tools, and consumer electronics. In addition, it provides status indication, safety features, and programmable charge parameters. This article will discuss the application field and working principle of MCP73855EV.

The MCP73855EV is capable of charging lithium ion, lithium iron phosphate, and nickel metal hydride batteries with up to 4.2 V and supports LiFePO4 battery type. It is capable of regulating both Constant Voltage (CV) battery charging and Constant Current (CC) operation while battery charging, and features an LED indicator for charge/discharge status and active charging. MCP73855EV also features over-temperature, over-voltage, over-current, and short-circuit protection.

The MCP73855EV requires inputs such as system voltage, system ground, battery temperature, battery voltage, and battery current. It also provides outputs for LED and charge enable control. The input pin VIN can accept an input voltage range of 6V to 18V to provide appropriate charging voltage and current for various battery types.

The working principle of MCP73855EV can be divided into two stages, the Pre-Charge stage and the Charging stage. During the Pre-Charge stage, the MCP73855EV first detects and compares the battery voltage and VIN voltage to activate the switching MOSFET and then, using the internal N-channel MOSFET, it charges the battery from the input source. When the battery voltage reaches a predetermined voltage, the pre-charge stage is complete and enters into the Charging stage. During this stage the MCP73855EV uses an internal current mode switch converter to control the battery charging current level to the programmed value, and the LED indicator is used to indicate the charging status.

The MCP73855EV offers several advantages such as low external component count, low operating supply current, and optimized switching frequency to reduce EMI. Furthermore, the external sense resistor of the MCP73855EV can be reduced to as low as 0.001 Ohm to minimize power losses. Finally, the device features current and temperature protection, which protect the battery and the MCP73855EV itself in the event of a fault condition.

The MCP73855EV is an evaluation and demonstration board and kit that provide an Energy Measurements Tool Kit for the design and evaluation of power sources for lithium-ion battery charging. It is also used in development and testing of portable electronics, power tools, and consumer electronics that require lithium-ion battery charging. It offers a convenient and easy-to-use solution to evaluate and design battery charging systems, while providing a comprehensive evaluation platform for the measurement and analysis of power sources.

In conclusion, the MCP73855EV is a complete solution for evaluation and demonstration of battery charging systems. It offers low external component count, low operating supply current, and optimized switching frequency to reduce EMI. Its external sense resistor and current and temperature protection circuits help to minimize power losses and protect the battery. The device is widely used in development and testing of portable electronics, power tools, and consumer electronics that require lithium-ion battery charging. Therefore, it is an ideal solution for evaluation and demonstration of power sources for lithium-ion battery charging.

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