ISL61853CIRZ

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Hot swap controllers provide verifiable safety when providing energy to critical components in systems that cannot tolerate sudden power losses, like mission-critical systems. ISL61853CIRZ is one of just a few integrated hot swap controllers available on the market which is designed to provide the safety protection layer many applications require. Most hot swap controllers are built with discrete components while the ISL61853CIRZ integrates a slew of features within a single integrated circuit. This article will explore the features and functionalities of this IC, along with its application fields and working principle.

Features

The ISL61853CIRZ integrates numerous features that make it well-suited for hot-swap applications. From its 2.1V internal low-side mosfet to its low-side current limit, the IC provides a range of features that maximize system safety in the event of a fault. Among its key features are dual mode sense (for better power supply loading), output voltage monitoring, current limit pull-back, adjustable delay and an over-temperature blank time.

The IC also supports voltage regulator and power supply hot plugging. When the power supply is switched on, the device is set to regulate output voltage with current limit. When a fault occurs, it immediately decreases the current limit and turns off the MOSFET at a user-defined current limit threshold while the IC is still in regulation. Additionally, the IC features a programmable soft start timer, which aids the device in power-up protection. Furthermore, an “on” status of the IC is indicated through an externally accessible STATUS pin.

Application Field

The ISL61853CIRZ is well-suited for applications such as servers, storage, communications equipment, and other electronic devices that require uninterrupted power delivery during hot-swap transitions. In such applications, the IC can actively manage the transition from either a first or second power source, ensuring smooth power delivery and fault protection.

The device’s programmable over-temperature threshhold enables the IC to handle sudden and intense power dissipation situations. The IC’s MOSFET also offers peak-current limit protection, in that if an over-current event exceeds the peak limit, the MOSFET will be disabled, followed by a restart of the device before the load is reapplied. This ensures smooth, uninterrupted power delivery during hot-swap operations.

Working Principle

The ISL61853CIRZ operates with low-side gate control technology, meaning it controls the gate voltage of a MOSFET. By doing so, the IC manages the on and off timing of the MOSFET while the load is connected to the power source. The IC’s regulated output voltage is regulated by its internal low-side MOSFET, which is activated by an external low-side sense signal.

The IC’s programmable current limit is internally set based on its external low-side sense signal. When the current limit is violated, the IC engages its current limit protection, immediately turning off the MOSFET until the current limit condition is resumed. Additionally, the IC supports a programmable delay to provide a gradual power up to the load.

Finally, the ISL61853CIRZ features a temperature-limiting mechanism. If the device’s temperature exceeds a certain threshold, it immediately turns off the MOSFET and then waits a certain time before proceeding with the power up cycle. This is done to prevent any thermal damage that may occur when supplying power to the load.

Conclusion

The ISL61853CIRZ is a single-chip integrated hot swap controller designed specifically for safety protection when supplying power to critical systems. The device combines several features, including dual mode sensing and programmable current limit for peak current protection, output voltage monitoring, adjustable delay and temperature blanking for thermal protection. Suitable for servers, storage, communications equipment, and other electronic devices, the IC provides a robust safety layer in hot-swap operations, ensuring smooth, uninterrupted power delivery during transitions.

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