ISL6141IB-T

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The Hot Swap Controllers are devices which allow the system designer to implment safe, accurate and reliable hot plug systems, in which power supplies and boards can safely be inserted and removed while the system is powered. ISL6141IB-T is a low-side current sensing Hot Swap Controller, working upon Hot Swap Principle and providing features and benefits.

Application Field: ISL6141IB-T is listed among the Hot Swap Controllers, which have third and fourth rails to support up to 48V systems. This device offers an ideal solution for applications in the telecommunications field, such as power shelves, where multiple power supplies and systems require simultaneous hot plug insertion and removal in order to deliver high power performance levels. It is also applicable in the industrial and server market for applications such as storage and racks and more.

Working Principle: ISL6141IB-T Hot Swap Controller uses the principle of hot plugging to provide total solution for power system design, allowing the safe removal and insertion of power load regardless of system power status. It is a low-side current sensing controller, which provides an efficient control of the gate driver. The device offers a package of features, composed of integrated overvoltage protection, overcurrent protection, undervoltage protection and other in order to provide a complete hot-swap/load-switch solution. It also feature a unique power-good detection.

This device is based on low-side current sensing, which requires the insertion of a current-sense resistor in series with the output of the Hot Swap device. The current passing through this current sense resistor is converted into a voltage drop which is proportional to the load current. This voltage drop is sensed by the controller, which generates a voltage output, proportional to the output current, to turn off the gate driver in case of an over-current event. The sense voltage is set for over- current protection by adjusting the resistor to achieve a desired current threshold.

The Hot Swap Controller includes a unique set of protection features. The input, 3.2V to 48V wide range conforms with 48V hot swap voltage environment, providing a 8V to 36V dynamic range. It also features overvoltage protection, overcurrent protection and undervoltage protection capable of removing power from the hot-swap/load-switch in case a fault or overload occurs. It also includes a unique overtemperature protection, preventing device operation when the die temperature exceeds 10°C.

The ISL6141IB-T\'s external enable is an open-drain enable pin integrated with internal weak pull-up, allowing the controller to remain enabled until the enable is explicit disabled by pulling it low so the power stage can be disabled. The enable enables clean start up, bypass delay problems and allows for an additional system with safety monitoring. The device also includes a power good indication. The power status can be monitored by the power-good output, also providing an indication when the gate driver is operating.

In conclusion, the practice of power system design is complicated, however the use of ISL6141IB-T Hot Swap Controller simplifies complex design process by providing control and protection features for hot-swap and load switch applications. ISL6141IB-T allows device to be safely inserted and removed while the system is powered, making it a reliable solution in the telecommunications field, industrial and server market and other.

By integrating overvoltage protection, overcurrent protection, undervoltage protection, overtemperature protection and other features, ISL6141IB-T provides a complete hot-swap/load-switch device driven by a low-side current sensing principle. The external enable, open-drain enable pin and power-good indication complete the circuit and make this Hot Swap Controller a safe and reliable solution for 48V power systems.

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