ISL61853KCRZ

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ISL61853KCRZ

ISL61853KCRZ is a PMIC - Hot Swap Controller from Intersil that provides precision current, over current and thermal protection for high current systems with strict cost and component count requirements. This Hot Swap Controller is designed for use in commercial applications with input power voltages typically greater than 12V and often find use in distributed power systems. Its use in current limited and current sensing applications provide reliability and protection where high current and tight current limits are essential.

Application Field and Installation

ISL61853KCRZ can be used in many applications, such as xDSL, synchronous optical networks (SONETs), power-over-fiber (PoF), lasers, power supplies, multi-processor systems, Firewire backplanes, and many other hot swap applications. It is a component of a larger hot swap system, which requires a drive, sense and pull-down elements, along with a hot swap controller such as the ISL61853KCRZ. The component may be installed, depending on the application, on the free side of the board either conductive or non-conductive.

Working Principle

The ISL61853KCRZ is a complete hot swap controller capable of delivering up to 500mA of hot plug current and providing complete over-current and thermal protection while integrating two logic-controlled MOSFET drivers. It requires only one external current limiting resistor and specific user-defined circuit elements, enabling it to be easily configured in a variety of hot swap and current- sensing applications. The Hot Swap Controller follows a three-level process: pre-charging the bus, monitoring, and fault protection. The pre-charging process ensures that the AC and DC offsets present on the bus will not cause a ground bounce and interfere with the sensitive parts of the system. Creates The controller also monitors the power and current at all times, to protect from Inrush current and an over-current condition. The Fault protection phase activates the overcurrent protection, changing the gate voltage of the MOSFET to turn it off, thus limiting the current.

Functions and Features

The ISL61853KCRZ controller is a single chip hot swap controller, compatible with 5V or 12V VCC power supplies. It has low typical quiescent current of 50-90uA and features adjustable current limit, adjustable under-voltage lockout, adjustable soft-start and adjustable VSD. The controller also comes with integrated thermal shutdown to limit losses due to excessive current and under-voltage lockout, which prevents the drive from operating during the discharge cycle of a battery.

Advantages

The ISL61853KCRZ from Intersil offers several advantages compared to traditional controllers. It is a cost-effective solution compared to more complex protection circuits that require additional components, such as current sense resistors and/or secondary regulators. Its over-current protection limits peak current to a safe value in the event of a short-circuit. It also provides soft start and adjustable output voltage, allowing users to customize their system for their application. Finally, its integration of logic-controlled MOSFET drivers reduces the amount of external components needed, reducing costs.

Conclusion

The ISL61853KCRZ Hot Swap controller from Intersil is a cost-effective, easy to use, and powerful solution for hot plug/unplug operations. It provides reliable, high current monitoring and over-current protection and is suitable for a variety of commercial applications. The controller requires a minimum of external components, reducing costs and system complexity. The result is a reliable, secure and cost-efficient solution for any hot plug/unplug design.

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