ISL61852ACRZ

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ISL61852ACRZ is a hot-swap controller that is designed to allow board-level components to be safely and reliably connected and disconnected from power sources without causing damage due to inrush currents, over voltage, and overtemperature conditions. It is a low-cost solution for a variety of hot-swap applications, such as server and telecom applications, as well as intelligent automotive systems. The ISL61852ACRZ allows the voltage on the load side to be ramped up or down in a controlled manner to minimize stress and ensure safe operation.

Application Field

The ISL61852ACRZ can be used in a variety of different hot swap applications, including servers, telecom, and intelligent automotive systems. It has been designed to handle hot-swapping of high-power load up to two Amps at up to 26V. The controller is well suited for processing high-density system designs in telecom, networking, storage, and server infrastructures.

The ISL61852ACRZ is particularly desirable for server applications due to its advanced power management capabilities. It is designed to ramp-up voltage to the load in a controlled manner to reduce Inrush current during hot swapping. It also features over-voltage protection, thermal shutdown, and adjustable fault timer that can be programmed to immediately or gradually shut down the output voltage.

The ISL61852ACRZ is also suitable for any application that requires hot-swapping of higher-current load up to two Amps, such as intelligent automotive systems. Its advanced safety features, such as positive temperature coefficient (PTC) operation, over-current protection and fault timer make it an ideal solution for hot-swapping automotive electronics.

Working Principle

The ISL61852ACRZ provides an integrated approach to hot-swapping of board-level components. The controller operates in a cycle-by-cycle current limit control mode with an adjustable maximum current limit. When an input voltage is applied to the controller, it will immediately start to ramp-up the output voltage. The speed at which the output voltage is ramped-up is determined by the voltage ramp rate setting and the load current. The maximum current limit is factory programmable and adjustable. If the load current exceeds the maximum limit, the controller will momentarily interrupt the output voltage. Once the current is stabilized, the controller will restart the ramp-up sequence and the output voltage will be ramped-up again.

The controller also features an over-voltage protection (OVP) circuit that quickly reacts to excess output voltage. When the output voltage reaches the OVP threshold, the controller will immediately shut down the output to protect the board-level components. The controller will also shut down if the input voltage falls below its lower limit or if the internal temperature exceeds its shutdown threshold.

The ISL61852ACRZ incorporates a fault timer that operates in two modes: immediate and gradual, depending on the user-defined settings. In immediate mode, the fault timer will immediately shut down the output voltage when an over-current event is detected. In gradual mode, the fault timer will reduce the output voltage in a graduated manner before shutting it down. This allows for a smoother shutdown, minimizing the stress on the components.

The ISL61852ACRZ is a complete solution for hot-swapping of board-level components. It provides advanced safety features and power management capabilities, while being a low-cost solution suitable for a wide range of applications, including servers, telecom, and intelligent automotive systems.

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