MAX5939MESA

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The MAX5939MESA is a hot-swap controller that provides high-current, low-noise and inrush limiting, enabling smooth and reliable system power-up when card-edge connectors are inserted. The device includes everything needed to support hot-swap functions in card-edge powered systems. The MAX5939MESA application field includes medical / lab equipment, expansion slots, and military systems.

The MAX5939MESA provides an absolute maximum current limit of 40A with a current foldback limit of 20A. Foldback current limit reduces heating, thus creating a fail-safe system. Additionally, the MAX5939MESA provides a manual or automatic inrush limit with timeouts of 1-30 seconds and delays of 1-4 ms.

The device has all protection features such as input undervoltage lockout, short circuit protection, and thermal shutdown. It also includes an output voltage monitoring feature which provides a “UVP-L” status bit. The MAX5939MESA is configured using an I2C serial interface and provides a logic-controlled enable function.

The MAX5939MESA’s working principle is simple and straightforward. When the power plug is connected to the card edge connector, the MAX5939MESA detects the connection and applies the given voltage to the output through the power FET. The device provides the necessary current limiter and inrush limiter which helps to protect the connected device from over current issues. The device also has a built-in thermal protector to shut down the system if the temperature exceeds certain limits. This ensures that the system does not overheat, thereby ensuring system reliability.

The MAX5939MESA is designed for card edge powered systems, providing robust and reliable power distribution. The device supports multiple voltage levels and an I2C interface for easy customization. The device provides a foldback current limit and inrush limiter to protect the connected device from over current issues and hot-swap events. Furthermore, the device includes all protection features such as input undervoltage lockout, thermal shutdown and output voltage monitoring.

In conclusion, the MAX5939MESA hot-swap controller is used to control voltage through card edge connectors in a safe, reliable and efficient manner. The device provides high-current, foldback and inrush limiting functions, along with other protection features, allowing for smooth system power-up. With its simple and straightforward working principle, the MAX5939MESA can be easily customized and configured to suit any application.

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