ISL61863FIRZ-T

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Power management integrated circuit (PMIC) is one of the key essential integrated circuits of modern electronic products. It is designed to manage and control power supply, enable work to be done in an efficient and safe manner. The ISL61863FIRZ-T is one of the popular PMICs and it falls into the category of hot swap controllers. This article focus on the application field and working principle of the integrated circuit.

ISL61863FIRZ-T Overview

The ISL61863FIRZ-T is designed to provide up to 20A current and 60V of voltage. It supports integrate hot swap controller, power-good indication, under-voltage lockout, current limit, short-circuit/thermal/organ protection, EMI filter and asynchrous high-side switch output. It integrates a low-side P-channel MOSFETs and N-channel MOSFETs, which are ideal for hot swap application requiring wide load range (low quiescent current to high maximum current). The input voltage range is 9V to 60V.

Application Field

The ISL61863FIRZ-T provides high current hot swap protection for customer applications such as industrial, datacom, telecom, server systems and much more. It is suitable for hot swap applications such as adding and removing nodes on live server racks, board-level hot swap protection of high impedance AC or non-isolated DC line where transient boost is a must. The integrated circuit can be used in embedded systems, base stations, LTE systems, optical access line cards, gaming systems and consumer electronics. It can also be used in LED lighting/display applications for low power LED lighting as well as LED backlight.

Working Principle

The ISL61863FIRZ-T offers an adjustable current limit and a two-level over temperature protection feature. It uses the Undervoltage Lockout (UVLO) control feature to protect circuits from inrush current. The internal feature helps to limit the inrush current via a soft-start circuit as voltage is applied, ensuring high quality and reliable startup. When the voltage is applied, the integrated circuit will wait until the voltage rises until a certain ENABLE_HYST high-threshold level and will then enable the hot swap protection. After the voltage is applied, the current limit will be activated and gradually increase the current to the rated current level.

The integrated circuit also offers a power-good indication (often referred to as a voltage supervisor) for monitoring the presence of output voltage. The power-good signal indicates whether the voltage is above or below the UVLO level, allowing for safe power sequencing for multiple power rails. The power-good signal can also be used to signal fault conditions or provide an early warning of over-current conditions.

The ISL61863FIRZ-T also offers an asynchronous high-side switch output, which can be used to signal other devices connected to the integrated circuit. This feature is particularly important in applications where the load current will remain operational even if the output voltage is disabled.

Conclusion

The ISL61863FIRZ-T is one of the popular and advanced PMICs as it integrates hot swap controller, power-good indication, under-voltage lockout, current limit, and other protection features. It supports a wide variety of applications and is suitable for hot swap applications requiring wide load range. The integrated circuit is ideal for embedded systems, base stations, server systems, and other applications that require hot swap protection.

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