ISL78206AVEZ-T

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The ISL78206AVEZ-T is a highly efficient, integrated, flexible, feature-rich DC/DC switcher regulator with Power Path capability. It is designed to handle a wide range of input and output voltages in an efficient and cost-effective manner, reducing board space and cost. This product offers a variety of features, making it an ideal power solution for space-constrained applications.

Application Field of ISL78206AVEZ-T

The ISL78206AVEZ-T chip is a DC/DC switching regulator which is centred around power management applications, including building block processing sub-systems in consumer, computer, communications and data-acquisition systems. Thus, it operates in tiers from servers, personal computers, hard drives, HBA, video cards and peripheral buses with various power requirements. In addition, it is also a suitable choice in mobile phones, cellular and cordless phones, set top boxes, digital audio and multimedia applications.

Due to its highly efficient operation, the product offers lower overall power dissipation within tightly regulated parameters, allowing for improved system performance, better system reliability and longer life. Moreover, its ultra low quiescent current helps system designers to meet all the criteria required for solid performance and high efficiency in industrial, networking and computing applications.

Working Principle of ISL78206AVEZ-T

The ISL78206AVEZ-T chip utilizes a synchronous rectifier topology which avoids the power dissipations of diodes and reduces the size of input and output filter inductors. It also reduces the number of external components, thereby reducing the assembly cost, board space as well as the number of vias. Moreover, the device is also suitable for high-density solutions with multiple outputs.

The ISL78206AVEZ-T integrates two main sections – a pulse width modulated (PWM) controller and a synchronous P-channel MOSFET (PMOS). The PWM compares an inner loop voltage reference with an error amplifier to generate the switching signals for the PMOS. The chip has an operating frequency of 300kHz and an adjustable soft-start feature that eliminates inrush current. The maximum output current of the device is 6.5A and it has an input voltage range from 5.5V to 28V. Its adjustable output voltage range is from 0.8V to 5.5V.

The device’s power path feature allows power to both enter and leave the IC. This allows the device to deliver an output voltage even in the presence of an input voltage that is lower than the required output voltage. This operates by charging the integrated capacitor temporarily with an input voltage higher than the required output voltage. This capacitor allows the device to deliver the correct output voltage in the event of momentary drops in the input voltage.

Furthermore, the device has several integrated circuits such as an undervoltage lockout (UVLO) circuit, overcurrent protection (OCP) circuit, overvoltage protection (OVP) circuit, enable logic circuit and power good (PG) status circuit. The overcurrent protection circuit monitors the current to the output for start-up, normal operation and overheating conditions, providing protection to the system from over-current and short-circuit failures. The overvoltage protection circuit monitors the voltage at the output and shuts down the device if the voltage falls outside the acceptable range.

The enable logic circuit allows the programmer to enable/disable the switching regulator via an enable input pin. The power good status indicator will indicate when the output voltage is within its programmed range. The UVLO circuit ensures that the device will not operate until the UVLO goes to a programmed level.

In conclusion, the ISL78206AVEZ-T is an impressive device that offers an excellent solution for a wide range of applications where efficiency, flexibility, and cost are important considerations.

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