ISL9444CRZ-T

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The ISL9444CRZ-T is a synchronized OFF-time constant frequency, Step-Down PWM controller designed for high performance, high efficiency, wide input voltage range applications. It features integrated high-side and low-side MOSFET drivers with switching up to 10MHz, and it has multiple fault protection features for safe operation including brownout/thermal shutdown, internal overvoltage protection, and overcurrent protection functions. In addition, its current mode control helps to reduce the output voltage ripple and it can operate in both the discontinuous and continuous conduction modes.

The ISL9444CRZ-T application field includes portable electronics and computing, telecommunications, automotive, industrial, and networking applications. It is suitable for medium to high power non-isolated synchronous buck DC-DC converter applications. It can support input voltage up to 48V and it is capable of delivering up to 15A of output current.

The working principle of the ISL9444CRZ-T is based on a current mode PWM control algorithm. The supply voltage is first converted into a reference voltage by a voltage divider. The reference voltage is then compared with the sensed output voltage to generate an error signal for the current mode operation. The error increase is then determined and the MOSFET gate voltage is increased to switch the high side MOSFET on and reduce the output, resulting in an increased current flow.

When the output current reaches the peak current limit, the high side MOSFET turns off, reducing the output voltage and increasing the output current flow. When the output voltage is regulated, the current in the loop is decreased and the MOSFET gate voltage is also decreased. This process is then repeated until the desired output voltage is attained.

The ISL9444CRZ-T has various fault protection features such as thermal shutdown, overvoltage protection, and overcurrent protection. It also has an internal voltage regulator and an external voltage divider to provide a stable voltage, and a high performance logic control circuit to ensure efficient operation. Moreover, it includes a wide range of built-in features like optimised PWM operation, sync frequency switching, enable/monitor pin, and spread spectrum.

In conclusion, the ISL9444CRZ-T is a reliable, high-performance DC-DC step-down constant frequency PWM controller suitable for a wide range of applications. It features integrated high and low-side FET drivers and its advanced current mode control algorithm ensures efficient operation. It also provides multiple fault protection features, ensuring secure and reliable operation. Its wide range of features and high efficiency make it an ideal choice for use in portable electronics, automotive, telecommunications, industrial, and networking applications.

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