LTC4222IUH#PBF

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LTC4222IUH#PBF is a Hot Swap controller widely used in the field of power management integrated circuit (PMIC). It provides a comprehensive hot swap control solution for boards, servers, and subsystems. With integrated current sense, current limiting, inrush current control, it provides overvoltage and undervoltage protection for the supply rail, and mechanical relay and MOSFET control logic. Some applications of LTC4222IUH#PBF feature system power-up sequence, overvoltage and undervoltage protection, load current and inrush current monitoring, slew rate control and air-gap control, system reboot without power cycle, and separate power up/power down control.

The LTC4222IUH#PBF makes use of a low RDSon(on) output MOSFET to control the power path to ground when the load power is removed or failure occurs. This device has advanced low quiescent current control to avoid wasting energy during normal operation. The overvoltage and undervoltage thresholds can be set using the OVT and UVT attributes.

The working principle of the LTC4222IUH#PBF is summarised as follows. First, the Overvoltage (OVT) and Undervoltage (UVT) attributes are used to set the overvoltage and undervoltage thresholds, respectively. When the voltage at the VS pin exceeds the OVT level, the device operates in a controlled shut down mode and the load current is reduced instantly. A soft-start current limit is automatically implemented at power up and additionally, the current limit at hot swap power-on can be programmed with two adjustable resistors. In addition, an adjustable inrush control function is provided to limit the rate at which the supply voltage rises when a hot-swap power rail is connected. The LTC4222IUH#PBF also provides a mechanical relay de-energisation pin, which falls when the power supply voltage is too low to be maintained, so that the relay will not provide a connection to the hot-swapped board.

The LTC4222IUH#PBF also provides a load current monitor and load current limit. This device can detect hot swap load current and can be used for monitoring and protection purposes. The load current is monitored via an on-chip sense resistor and the current limit can be programmed using two adjustable resistors. Moreover, the LTC4222IUH#PBF offers a delay on/off power-up control, which can be programmed to specify when to enable the load power path while powering up the board. This allows a system power-up sequence to be implemented with clean power-up and power-down waveforms.

In conclusion, the LTC4222IUH#PBF is a highly integrated Hot Swap controller used to protect and monitor the supply rail. It provides advanced current limiting, overvoltage and undervoltage protection, mechanical relay and MOSFET control logic, and load current monitoring. With integrated features, it can be used in system power-up sequence, overvoltage and undervoltage protection, load current and inrush current monitoring, slew rate control and air-gap control, system reboot without power cycle, and separate power up/power down control. This makes it an ideal choice for PMIC solutions.

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