ISL61852FCRZ

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The ISL61852FCRZ is a high performance, pulse-by-pulse current limit hot swap controller providing precision protection for 5V-compliant systems such as servers and storage systems. As a member of the ISL61850 Hot Swap Controllers family, it provides safe and reliable turn-on, hot insertion/hot removal, and fault conditions monitoring and management functions.

The ISL61852FCRZ is designed to be used with a DC/DC converter to provide main regulation control, as well as low-voltage fault protection. It features a wide programmable current limit range, over-voltage, under-voltage, exposed pad temperature detection, and programmable on-delay and off-delay timers. The device features a high-precision 4-bit programmable current threshold that accurately controls the turn-on or turn-off points of the gate drive of the switches. By preventing switching losses from appearing before the power supply is ready, the hot swap function saves system power.

The device provides a 3-state logic output for system management, indicating the status PGOOD of the power system. The logic output does not depend on the supply voltage, making it ideal for charging and discharging multiple batteries. Also, is provides power monitoring for the rails to determine the end of charge and discharge situations, as well as warning for fault events.

The ISL61852FCRZ supports two operations, manual and automatic current fold-back. In manual fold-back operation, the user programs the system to disable or reduce current at certain levels. In automatic fold-back operation, the ISL61852FCRZ detects different kinds of fault conditions and autonomously reduces the current flow. This ensures a safe shutdown of the power system.

In addition, the hot swap controller features a precision power good timer which can ensure that a minimum voltage is reached before the system deems it is ready. The device also provides an internal soft start circuit which controls the switching power supply in a controlled manner.

The ISL61852FCRZ also includes an external driver enable which can enable/disable the gate drive of two gate drivers which is useful for hot swap applications. Another unique feature of the device is its dual-channel isolated enable for improved reliability and protecting against transient ground faults.

In summary, the ISL61852FCRZ is a powerful and robust hot swap controller that provides many useful features and benefits for AC/DC systems. It provides precise voltage, current and temperature monitoring, accurate current limit settings, over-current, over-voltage and ground fault monitoring, as well as support for multiple battery configurations with built-in soft start and power good timer. The device is a cost-effective solution for hot swap control applications.

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