ISL61852DIRZ

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The ISL61852DIRZ controller is a high-current, high-side, load-shareable, synchronous rectification Hot Swap control IC for 3.2V to 60V applications. This IC provides inrush current limiting, overvoltage protection, and the ability to regulate current to multiple outputs and load-sharing capabilities.

The ISL61852DIRZ controller’s Hot Swap application field is ideal for powering FPGAs, networked and distributed power systems with multiple power rails, and systems that include switched power supplies or multiple voltage rails. This device is also suitable for use in servers, workstations, telecom/datacom systems and storage systems.

The controller’s main purpose is to provide over-voltage and over-current protection in Hot Swap applications. In such applications, the IC will allow a hot-pluggable load to be connected to a power source without damaging the source, load, or either of them. Hot Swap applications are used often in data centers and other systems that need to plug and unplug components without powering down the entire system. Hot Swap controllers, such as the ISL61852DIRZ, provide additional protection in these applications as they regulate currents and voltages on multiple rails for maximum power delivery.

The ISL61852DIRZ contains two main types of protection mechanisms: current limiting and overvoltage protection. Current limiting is designed to avoid potential hazardous electrical events by limiting the current that is allowed to flow through the system. Overvoltage protection ensures that no voltage will exceed its rated voltage. This prevents damage to the load and power source from overvoltages.

The ISL61852DIRZ has a number of working modes that can be used to control the current and voltage in various applications. In “Fixed Current” mode, the controller will only draw a fixed peak current, regardless of the load, making it suitable for providing a current-limited supply. In “Active Current Limiting” mode on the other hand, the controller will actively limit the current to ensure that the system remains stable. “Transient Limiting” mode is used to improve the current waveform of high-power systems, while “Dynamic Current Limiting” mode is used to limit the current of dynamic loads.

The ISL61852DIRZ Hot Swap controller contains a buck converter to provide a regulated voltage. The buck converter has a low-side MOSFET switch and a series N-channel MOSFET for synchronous rectification. This switch is used to limit the current that is drawn from the power source. The converter also has an internal voltage divider, allowing the voltage regulation level to be set. This together with overvoltage protection and load-sharing capabilities makes the ISL61852DIRZ an ideal Hot Swap controller for high power applications.

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