MCP73844-820I/MS

Series:	--
Packaging:	Tube
Part Status:	Active
Battery Chemistry:	Lithium-Ion/Polymer
Number of Cells:	1 ~ 2
Current - Charging:	--
Programmable Features:	Timer
Fault Protection:	--
Charge Current - Max:	--
Battery Pack Voltage:	8.2V
Voltage - Supply (Max):	12V
Interface:	--
Operating Temperature:	-40°C ~ 85°C (TA)
Package / Case:	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Supplier Device Package:	8-MSOP
Base Part Number:	MCP73844

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MCP73844-820I/MS Application Field and Working Principle

The MCP73844-820I/MS is an advanced lithium-ion battery charger with low resistance sense that offers precise voltage control and fast charge times. With an integrated precise voltage regulation system, the MCP73844-820I/MS is able to ensure maximum safety and reliability while providing flexible charging solutions and precise charge termination. It is highly suitable for applications that require high levels of accuracy and precise temperature control, such as medical and automotive.

Application Field

The MCP73844-820I/MS is ideal for systems that require precise voltage regulation. It can be used in a variety of applications including medical, automotive, industrial and consumer electronics. The device is capable of charging a wide range of battery specifications such as Li-Ion, Li-Po, LiFePO4 and NiMH/Cd cells. It is equipped with a built-in PTC that protects against bad cells, over current and short circuit.The device supports a wide battery voltage range from 4.2V to 18V and can charge up to three cells in series. It has a charging current up to 2A, making it suitable for supporting high current loads. It can also be configured for charging lithium-ion batteries of different voltages in parallel connection.The MCP73844-820I/MS is equipped with an excellent thermal design, allowing it to maintain optimal performance and safe working temperatures even during extended high current charging sessions. It features an adjustable termination voltage tolerance and timer, allowing precise charge termination and prevention of over-charging. The battery temperature sensing input allows customers to monitor batteries to prevent over-charging and deep discharge.The MCP73844-820I/MS chargers are completely protected against reversed polarity, over current and over temperature considering ease of use, cost and space efficiency. They also feature a low standby current to reduce consumption and power loss, allowing more efficient operation and longer run times between charges.

Working Principle

The MCP73844-820I/MS uses pulse charging technology to charge batteries with a constant current or constant voltage depending on the battery type. The device monitors the battery and shuts off the charge cycle when the battery is at its full capacity in order to prevent overcharging.The device has multiple charging phases: pre-charge, constant current, constant voltage, and recharge. During pre-charge, the charger slowly ramps up the charging current, allowing the chemical reaction to begin. This is important for larger capacity cells, as it prevents thermal runaway.The constant current phase is where the charger maintains a constant current. This is where the power to charge the battery is continuous and the battery voltage slowly increases until it reaches the peak voltage, which is determined by the battery chemistry. After this point, most charge controllers enter the constant voltage phase, where they slowly decrease the current. As the voltage slowly decreases, the battery enters a recharge phase where a small current keeps the battery balanced.Once the battery reaches its end voltage, the charger stops charging. This allows the battery to remain charged without overcharging, enabling better battery life and safety.

Conclusion

The MCP73844-820I/MS is a highly efficient and precise battery charger with an integrated low resistance sense, suitable for applications that require quick charge times, precise voltage control and temperature sensing. It is a versatile battery charging solution for a variety of applications, including medical, automotive, industrial and consumer electronics. With its adjustable termination voltage tolerance and timer, it ensures precise charge termination and safe battery charging. Additionally, its low standby current ensures more efficient operation and longer run times between charges.

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