ISL61862ACRZ

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PMIC - Hot Swap Controllers

Integrated circuit (IC) hot-swapping is a technology used to increase system reliability, enable system redundancy, and increase system upgrade capability. Hot-swapping is typically used in the context of replacing a device already connected to an active system without the need to turn off the power or disrupt the operation of the system. A hot-swap controller, such as the ISL61862ACRZ, is an IC specifically designed to enable hot-swapping a device with minimal impact to system stability.

ISL61862ACRZ Application Field

The ISL61862ACRZ is an integrated hot-swap controller that provides system protection, control, and monitoring. It is suitable for mainstream designs of hot-swap applications such as Ethernet/USB modules, "PayGo" power supplies and configurable power supplies with multiple outputs, to name a few. Its large overvoltage protection ranges, large operational windows, and configurable glitchless power-on set-up feature make it suitable for protecting high-speed buses and operating at high-speed input voltages.

The ISL61862ACRZ also features a full internal linear and MOSFET start-up sequence that is designed to limit inrush current on high power systems while keeping output voltage levels and current ripple within specification. Additionally, its on-chip brown-out and undervoltage lockout circuits can lead to up to 30% greater energy savings in comparison with standard hot swap controllers.

Working Principle

The ISL61862ACRZ hot-swap controller works through a three-step start-up sequence. First, it provides a user-configurable soft-start to minimize inrush current. During this step, both the linear and MOSFET start-up stages are evaluated. Second, the output voltage is monitored to ensure it stays within the established thresholds. Finally, the device is ready for ‘Hot Plug’ operation; when the system senses a valid load, the device will activate its MOSFET switch and complete the start-up sequence.

The controller’s ‘Hot Plug’ operation is designed to protect the system from input overvoltage spikes and from any current surge resulting from the device insertion. Should the output voltage exceed a user-defined threshold, the controller will operate its MOSFET switch in a reverse direction to divert the current away from the board. Additionally, the ISL61862ACRZ is equipped with a number of monitoring functions to prevent possible system damage caused by an excessive temperature of the active area.

Finally, the device offers configurable control slots to expand its capabilities. These include overvoltage protection, undervoltage protection, overcurrent protection (with fault detection), and thermal protection. In addition, extra interfacing circuits are included to allow system designers to implement custom functions to suit their individual application needs.

Conclusion

The ISL61862ACRZ is an advanced hot-swap controller designed to meet the stringent requirements of hot-swap applications. Its large operating windows, configurable start-up and monitoring features, advanced protection subsystems, and configurable control slots provide embedded system designers with a robust and reliable tool for protecting their device during hot-swap operations.

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