ISL6324IRZ

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The ISL6324IRZ is an advanced special purpose voltage regulator from Intersil. It is a monolithic, high-efficiency switcher optimized for ultra-low standby power. It is specifically designed to minimize quiescent current with light load conditions and to offer high power conversion efficiency even low VOUT/VIN ratios, making it ideal for a variety of portable, battery-operated, and applications like the ones related to computing and communication. Also, ISL6324IRZ is equipped with a shutdown (EN) pin and a thermal shutdown circuit with hysteresis, so that it is robust and reliable.

The ISL6324IRZ is designed to regulate input voltages in a range from 1.8V to 5.5V and output voltages up to 1.5V with a full integration of an oscillator, a logic control block, a voltage reference, an error amplifier, and a low RDS(ON) DMOS power switch. This feature allows for a small footprint of only 5mm × 6mm making the device suitable for space-constrained applications. In terms of protection features, it has an undervoltage lockout, an overvoltage protection, a power-on reset, and a cycle-by-cycle current limit that limits the maximum peak current during fault conditions.

The ISL6324IRZ is an ideal voltage regulator for portable and low power applications because its ultra-low quiescent current and high efficiency coupled with its small size, make it an ideal choice. Moreover, it boasts a very low standby power consumption, allowing the system to maintain its low power states while the power conversion is active. Specifically, this device can provide up to 4.5A output current and up to 95 % efficiency. The high output current capability combined with an extended temperature range ensures a reliable system operation.

The working principle of the ISL6324IRZ is simple and it works as a buck regulator. The external components are only four, which are a ceramic output capacitor and three small surface-mount resistors. This helps to reduce the cost and the bill of materials needed. The main components in this voltage regulator are the oscillator, adjustable switch-on voltage, high voltage switch, low RDS(ON) DMOS power switch, error amplifier, feedback resistor divider, current limit and soft-start.

The oscillator section of the IC is the start of the voltage regulation loop. It generates a rectangular waveform from an external resistor and capacitor. The adjustable switch-on voltage section is then used to compare the voltage generated by the oscillator to the reference voltage, the voltage at the output of the regulator is monitored and the error amplifier compares its output to the desired reference value.

A feedback resistor divider is used to compare the output of the regulator against the desired reference voltage. When the voltage is lower than the reference voltage, the error amplifier turns on the high voltage switch, turning on the power switch. The power switch then delivers current from the input source to the output filter before being sent to the load.

The current limit section of the IC limits the peak current delivered by the power switch during fault conditions. The current limit keeps the power switch output current below a certain threshold and in turn keeps the output voltage stable. The soft-start section of the IC ensures that the output voltage rises gradually as the load gradually increases so that the output voltage is not subject to sudden surge events.

In conclusion, the ISL6324IRZ is an ideal voltage regulator for portable and low power applications where ultra-low standby power is needed. It is designed to regulate input voltages in a range from 1.8V to 5.5V and output voltages up to 1.5V and supports up to 4.5A of output current and up to 95 % efficiency. It requires a minimum of four external components resulting in a low bill of materials, and also boasts a very low standby power consumption.

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