MCP73842-840I/UN

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The MCP73842-840I/UN from Microchip Technology Inc. is a highly advanced single cell Lithium-Ion/Lithium Polymer (Li/Li-Poly) Charge Management Controller targeted for space-limited, portable device applications such as wearables, mobile phones and other small-form factor systems. The MCP73842-840I/UN enables USB charging port compatibility and true input-voltage auto-detection. The MCP73842-840I/UN charge management controller is designed to manage and optimize the power distribution between the power path and charging circuit sections of the host system. It is optimized to achieve high efficiency over the entire battery charge profile while maintaining current limited charging. The MCP73842-840I/UN features multi-mode charging which allows either constant current or constant voltage mode selections depending on host system preferences.

The MCP73842-840I/UN can communicate with the host system microcontroller in either one or two-wire configuration. It offers control of the system power connector using an “Enable” pin. This allows the host system microcontroller to enable or disable the system power connector through the enable pin. It also includes an open-drain status output which indicates when the battery is full or when the charge current is falling below the preset minimum threshold. This allows the host system to detect when the battery has been fully charged or when the charge condition has changed.

The MCP73842-840I/UN is designed to operate with single-cell lithium polymer and lithium ion batteries between 3.6V and 4.2V. It supports a number of charging profiles, including input voltage auto-detection, constant current and constant voltage charge modes. It also offers optional pre-charge and trickle charge modes, as well as temperature monitoring with selectable thermal protection to protect the battery from being overcharged in certain conditions.

The MCP73842-840I/UN is designed to provide high efficiency charging and power management. It offers an input voltage detection range of 3.7V to 8V, allowing charging support for USB ports and AC adapters. Its advanced current monitoring and charge control provide enhanced system integrity and improves the overall efficiency of the battery charging circuit. The current limiting resistor protection is a unique feature of the device, which helps to improve system safety by preventing current overload and ensuring safe operation regardless of input voltage condition.

The MCP73842-840I/UN includes advanced power management features. It includes an integrated power switch and adjustable current limit that allow the device to precisely control the charge and discharge current by accepting input from the host system microcontroller. It also features an output power switch with overload protection, programmable short circuit protection and high temperature protection to protect the system in the event of faulty conditions.

In summary, the MCP73842-840I/UN charge management controller from Microchip is an ideal solution for space-constrained portable devices. It offers USB compatibility, high efficiency charging and power management, along with advanced safety features. It is highly suited to portable, wearables and other small-form factor system applications, where precise charge and power management is essential.

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