ISL6745AUZ

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The ISL6745AUZ is a dual-output buck controller with integrated power MOSFETs designed for high current, wide input voltage range and high efficiency applications in Point-of-Load (POL) converters. This controller is a pulse width modulated buck controller that incorporates analog signal performance along with digital signal processing for improved system accuracy and performance. The ISL6745AUZ family, with its wide supply voltage range, fast transition times, low quiescent current, and low output voltage ripple, is ideal for general purpose voltage regulation, as well and for applications where exceptional dynamic stability and high efficiency is desired, such as automotive, communications and industrial control applications.

The ISL6745AUZ buck converter has two independent buck channels and integrated MOSFETs. Each channel has its own enable pin, and can be used to control two separate output converters. The enable pin of each channel is internally connected to the output voltage sense pin, so that the voltage can be adjusted through the enable pin. The outputs of the two channels are independently adjustable with an output current range that can be set from 0A to 20A. The two integrated MOSFETs are low on-resistance devices with low channel-to-channel variation, enabling efficient power conversion.

The ISL6745AUZ buck converter also features an adjustable soft-start, where the output voltage can be smoothly ramped up to its final level. A low quiescent current (Icc) is achieved by using a constant 3.3V supply voltage and a voltage mode control. Also included is a frequency foldback feature to prevent overcurrent protection when the duty cycle changes quickly. This prevents overcurrent shorts and other problems from occurring due to the rapid changes in the duty cycle.

The ISL6745AUZ has several protection features to protect its internal components. A maximum current limit prevents a switch from carrying current greater than the specified maximum current limit. There is also an over-voltage protection (OVP) to prevent an output voltage from going above the specified maximum value. It also has an under-voltage lockout (UVLO) to prevent a converter from starting up when the output voltage goes below a certain value. Finally, the ISL6745AUZ has a short-gate protection, which prevents a short circuit from occurring.

In conclusion, the ISL6745AUZ is a high-performance dual-output buck controller suitable for point-of-load converters. Its wide supply voltage range and fast transition times allow for efficient and accurate power conversion. The integrated power MOSFETs are low on-resistance devices with low channel-to-channel variation, and its protection features protect its internal components from overcurrent and overvoltage conditions. This makes the ISL6745AUZ an ideal choice for a wide range of applications, from general purpose voltage regulation to automotive, communications and industrial control applications.

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