ISL9501CRZ-T

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The ISL9501CRZ-T is a monolithic DC-DC switching controller designed for step-down (buck) single output applications. It accommodates a wide input voltage range from 4V to 28V, making it ideal for automotive and industrial applications. Furthermore, its wide adjustable output voltage range (1V to 24V), low operating current, and low-side MOSFET is optimized for the buck architectures.

The ISL9501CRZ-T DC-DC controller offers a variety of operation modes to meet design requirements. It offers several functional protections such as under voltage lockout (UVLO), over voltage protection (OVP), and over current protection (OCP). It also features an adjustable soft-start that helps prevent output voltage overshoot during start-up as well as pre-biased output voltage.

Thanks to its patented ChargeModeTM architecture, the ISL9501CRZ-T DC-DC controller allows both synchronous and non-synchronous operation at higher efficiency and extremely low output ripple, while providing excellent transient response. Furthermore, the controller includes Integrated compensator to minimise external compensation components, reducing the design cycle and cost.

The ISL9501CRZ-T is suitable for a wide range of applications such as automotive, telecommunications, point-of-load and industrial applications. Its numerous features and integrated protections make it ideal for such applications.

The working principle of the ISL9501CRZ-T is relatively simple. It is designed to regulate the output voltage from a given input voltage by switching an external power MOSFET. It employs an internal current-mode control circuit for precise and faster transient response, whereby the input current and output current are simultaneously compared with an internal reference voltage. The difference between the two currents is called the error signal, which is then used to adjust the duty cycle of the external power MOSFET.

In order to set the output voltage and regulation loop, the ISL9501CRZ-T uses a resistor divider connected to its REFIN pin. The voltage at the REFIN pin is then compared to an internal reference voltage, and the controller adjusts the duty cycle of the external power MOSFET accordingly.

In order to ensure that the external power MOSFET is always on, the ISL9501CRZ-T offers an adjustable soft-start feature that ramps up the output voltage from zero in a controlled manner during start-up. Furthermore, it also improves power supply sequencing for multiple output designs, by allowing the output voltage to rise in a pre-defined manner.

Overall, the ISL9501CRZ-T provides a cost-effective, high performance and high integration solution for buck converters, making it ideal for automative and industrial applications. It offers a wide range of adjustable input voltages, output voltages and current limits, soft-start, integrated compensator, and over-current protection.

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