MCP73834-FCI/MF

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PMICs, or power management integrated circuits, are semiconductor devices that provide power management solutions for devices ranging from everyday PCs to industrial and automotive systems. These solutions enable applications to operate efficiently and reliably by providing solutions that help manage and optimize the use of power while minimizing operating costs. This article will discuss the application fields and working principles of the MCP73834-FCI/MF battery charger, one of the PMIC\'s specialised solutions for battery charging.

MCP73834-FCI/MF is a high-precision, low-power, linear Li-Ion/Li-Polymer charger IC with integrated power path management and dual input assessment protection. This device provides three primary functions: charging of the battery, system control and a range of power protection features. It is designed to charge single-cell Li-Ion/Li-Polymer batteries and is ideal for applications requiring fast, efficient charging such as portable electronic devices, medical instruments, and other handheld devices.

For these applications, the MCP73834-FCI/MF is designed to operate with a wide input range and a wide battery range, as well as have standard 5-pins DFN package, 0.4 mm pitch, 1.6 mm body size, and compliant with the European RoHS, that allows the charger to easily integrate into portable devices. Additionally, the charge current, charge voltage, and charge termination current are programmable via the I2C interface.

The MCP73834-FCI/MF charger is compatible with USB BC 1.2 or proprietary chargers, providing protection from over-temperature, over-voltage, over-charge, and reverse charging. It also includes an integrated safety timer to prevent over-charge situation. Moreover, the MCP73834-FCI/MF is compliant with the latest USB specifications, providing fast charging with up to 1.1A. It also features an Adaptive Power Path MOSFET that efficiently manages power from both the input and the battery, allowing the application to continue to operate while charging the battery.

How does it work? The MCP73834-FCI/MF charger employs 4 charging modes based on input source, system status and device configuration.

First, Sleep Mode. When the chip is powered down, the charger is in a low-power sleep state, where it maintains the battery\'s charge and draws minimal quiescent current. This is useful for applications that may have short periods of inactivity such as medical instruments.

Second, Precondition Mode. Here, the charger applies a low start voltage and low charge current, before transitioning to constant voltage charge. This is done to improve battery lifetime and maximize charging efficiency.

Third, Constant-Voltage Charge Mode. This state is entered after the charger finishes preconditioning the battery. The charger then increases the charge voltage and current until either the battery voltage reaches the charge voltage limit or the charge current drops below a certain threshold.

Finally, Trickle Charge Mode. When the charge current drops below the threshold, the charger enters trickle-charge mode and reduces the charge current to a low level to sustain the battery\'s charge.

In addition to optimized charging, the MCP73833-FCI/MF offers power path management and dual input assessment protection, enabling applications to better manage their power needs. The power path management feature allows the application to continue to operate from the input source while charging the battery. It also features overcharge, overvoltage, overcurrent and overtemperature protection to ensure the battery is safely charged, and a safety timer to prevent over-charge situations.

In summary, the MCP73834-FCI/MF is a high-precision, low-power linear Li-Ion/Li-Polymer charger IC designed to rapidly and safely charge single-cell Li-Ion/Li-Polymer batteries. It offers 4 charge modes, compliant with USB BC 1.2 and proprietary chargers, as well as integrated power path management and dual-input assessment protection to enable applications to charge batteries while operating. With these capabilities, the MCP73834-FCI/MF is well-suited for applications such as portable electronic devices, medical instruments, and other handheld devices.

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