ISL6333AIRZ-T

The ISL6333AIRZ-T is a power management integrated circuit (PMIC) specifically designed to provide efficient, reliable and stable power to microprocessor (MPU) supplies. It belongs to the special purpose voltage regulators category. This PMIC includes overvoltage, undervoltage and over current protection, integrated voltage reference, comparator and loop compensation. The intended application field of the IC is in the instant-on chipset, core-logic supply, microprocessor power supplies and various computer peripherals.

The ISL6333AIRZ-T is optimized for efficient current sharing. Its operation is automatically controlled through an adjustable Soft-Start and limit circuitry, allowing it to operate without an external transistor. The device is also available in an integrated phase ordering solution, which provides sequencing and sequencing control, plus adjustable soft-start limit. The ISL6333AIRZ-T also features integrated voltage supervisor, dual-timed ±5% output voltage accuracy, adjustable power good trip point, positive and negative on/off logic control and over-temperature protection.

The operating principle of the ISL6333AIRZ-T is based on a voltage mode, charge pump topology. This topology is chosen over other topologies mainly due to its low cost, easy scaling, high efficiency and short cycle time. The charge pump uses a voltage, called VREF, to compare with the output voltage. If the output voltage is lower than VREF, the charge pump will charge up the output capacitor and boost the output voltage up. If the output voltage is higher than VREF, the charge pump starts to discharge the output cap by connecting it with GND and reduce the output voltage.

The ISL6333AIRZ-T also features a dual-channel programmable voltage switching regulator. This switching regulator controls the output voltage more precisely, allowing for a higher degree of accuracy. It works by adjusting the duty cycle of the switching regulator, which increases or decreases the amount of current going to the output. The switching regulator also helps reduce the amount of power dissipated in the IC, helping to reduce its power consumption and improve its overall efficiency.

The ISL6333AIRZ-T also features an integrated power event system to help minimize the effect of line transients. This system utilizes a low-dropout voltage regulator and a sensing circuit to detect line transients. When a transient is detected, the device is disconnected from the output and a fault flag is reported to the microcontroller. The device then attempts to re-establish connection to the output and resumes normal operation.

In conclusion, the ISL6333AIRZ-T is an efficient, reliable and robust power management IC intended for microprocessor (MPU) supplies. It is capable of providing precise voltage control, integrated overvoltage and undervoltage protection, over current protection and integrated voltage reference. It is also capable of providing dual-channel programmable voltage switching and integrated power event system for power transients. Its cost-effective and low profile makes it suitable for a wide range of applications, from instant-on chipsets to microprocessor power supplies.