MCP73842T-840I/UN Integrated Circuits (ICs)

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Battery Chemistry:	Lithium-Ion/Polymer
Number of Cells:	1 ~ 2
Current - Charging:	--
Programmable Features:	Timer
Fault Protection:	Over Temperature
Charge Current - Max:	--
Battery Pack Voltage:	8.4V
Voltage - Supply (Max):	12V
Interface:	--
Operating Temperature:	-40°C ~ 85°C (TA)
Package / Case:	10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
Supplier Device Package:	10-MSOP
Base Part Number:	MCP73842

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MCP73842T-840I/UN Application Field and Working PrincipleThe MCP73842T-840I/UN (Microchip Technology) is a type of power management integrated circuit (PMIC) with battery-charging capabilities. It’s a part of the MCP73842T series, which are three-cell lithium-ion/polymer (Li-ion/Polymer) battery-charge controllers. This series of PMICs provide end-of-charge (EOC) protection to maintain cell-capacity balance, over-voltage and over-temperature protection, plus system flexibility with a programmable input resistor. The MCP73842T is suitable for any applications requiring charging of mobile battery packs in mobile phones and other portable or fixed electronic products, and can also be used for general-purpose power supplies.General OverviewThe MCP73842T-840I/UN is a linear battery charge controller IC with 7-bit EEPROM that is designed to provide charging support for up to three Li-ion or Li-polymer batteries. It uses constant current/constant voltage charging algorithm for charging and has over-current, over-voltage, and over-temperature protection, along with cell-capacity balance protection. The IC also has a programmable input resistor and built-in fault detection and reporting, making it one of the most user-friendly charge controllers on the market.FeaturesThe MCP73842T-840I/UN offers many features that make it suitable for a variety of applications. It has a 7-bit EEPROM that allows for user-programmable protection settings and input-resistor settings. The IC also has four charge termination modes (number of cells, SOE voltage, timer, and Li-ion/ Li-polymer cell-level). It has over-current, over-voltage and over-temperature protection, along with cell-capacity balance protection. The IC also offers continuous system-monitoring, with the ability to identify faults and report them through an I2C interface. Finally, the IC has a programmable input resistor and can be calibrated for maximum efficiency.Working PrincipleThe MCP73842T-840I/UN works as a linear charge controller. It uses an internal current-limiting circuit to regulate the input current and maintain the output current-to-voltage ratio. As the battery voltage increases, the internal current-limiting circuit reduces the input current to maintain the constant input-to-output current ratio. The output voltage is regulated to a programmed level, while the output current is proportionally regulated according to the battery voltage. The IC also has over-voltage and over-temperature protection, as well as cell-capacity balance protection.ConclusionThe MCP73842T-840I/UN is a power management integrated circuit (PMIC) with advanced battery-charging capabilities. It is suitable for applications requiring charging of mobile battery packs in mobile phones and other portable or fixed electronic products. Its 7-bit EEPROM allows for user-programmable protection settings and input-resistor settings. It also offers over-current, over-voltage and over-temperature protection, as well as cell-capacity balance protection. The IC uses a linear charge controller, with an internal current-limiting circuit that maintains the input-to-output current ratio. With its advanced battery-charging capabilities, the MCP73842T-840I/UN is an ideal choice for applications requiring efficient and reliable battery charging.

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