LTC4228IGN-1#PBF

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Power Supply Management Integrated Circuits (PMICs) play a key role in the electronics industry by managing, monitoring, and regulating power supplies. In recent years, the growth of the interconnected internet of things has triggered a significant increase in the demand for robust, efficient power solutions. PMICs such as the LTC4228IGN-1#PBF provide a highly-flexible, integrated solution that simplifies power management design and enables boards to be powered over a wide range of voltages, temperatures, and conditions. As a Hot Swap Controller, the LTC4228IGN-1#PBF is designed to provide protection and flexible control over the insertion and removal of powered boards. In this article, we’ll explore the application field and working principle of the LTC4228IGN-1#PBF.

The LTC4228IGN-1#PBF Hot Swap Controller is well-suited for applications that require the hot insertion and removal of powered boards. When a board is inserted into a powered system, the Hot Swap Controller allows the board to be powered-on via a controlled power-up sequence. As the board is powered, the Hot Swap Controller monitors current, preventing over-current and inrush events that could damage the board or the connected system. As the board is removed from the system, the Hot Swap Controller provides controlled power-down, which prevents outrush current events that could also cause damage to the system.

The LTC4228IGN-1#PBF Hot Swap Controller offers a range of safety features, including over-voltage and over-temperature protection, along with programmable current-limit and inrush-limit control. The addition of programmable delay timers, board-removal sensing, and power-good output help reduce design complexity and enable efficient board power-up, power-down, and status reporting. The addition of a low-resistance MOSFET driver allows the LTC4228IGN-1#PBF to be used in applications where higher currents and lower voltages are required.

The internal circuitry of the LTC4228IGN-1#PBF Hot Swap Controller contains two integrated circuits: an operational amplifier and a voltage regulator. The operational amplifier measures the voltage of the board and compares it to the Vhot pin voltage, while the voltage regulator converts the input voltage to a level that can be used by the circuitry. Both of these circuits are protected against over-current and short-circuit events.

The LTC4228IGN-1#PBF Hot Swap Controller also contains an internal FET gate driver, which is responsible for controlling the on/off state of the MOSFET switch. The gate driver provides a low-resistance output for use in applications where higher currents and lower voltages are required. The FET gate driver can be adjusted using the VISENSE and CTL pins, allowing the user to adjust the gate drive current and turn-on threshold.

The LTC4228IGN-1#PBF Hot Swap Controller also includes an interrupt output pin, which can be used to detect abnormal conditions such as board-removal, over-current, and over-temperature events. The interrupt pin can also be used to alert other components in the system, such as microcontrollers, when a board is inserted or removed.

In summary, the LTC4228IGN-1#PBF is a robust and effective Hot Swap Controller that provides a range of safety features and simplifies design complexity. The controller provides programmable current-limit and inrush-limit control, as well as a low-resistance MOSFET driver, board-removal sensing, and power-good output. The addition of an interrupt output pin allows the user to detect abnormal conditions and alert other components in the system.

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