ISL9444IRZ-T

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The ISL9444IRZ-T is a high-efficiency, single-gate, buck, boost or dual-gate buck-boost controller designed for low-voltage, low-power applications.

The integrated powerstage is optimized for use as an offline switch-mode power converter controlled using pulse-width modulation (PWM).Its on-board standing-wave repartition (SWR) controller makes it well-suited for working in wide range of applications such as mobile devices, tablets, digital TV, battery operated applications, data storage and point-of-load (PoL) converters.

Application Field

The ISL9444IRZ-T, is well-suited for use in low-voltage, low-power applications where size and efficiency are important.These applications include but are not limited to, mobile devices, tablets, digital TV, battery operated applications, data storage and point-of-load (PoL) converters.

The ISL9444IRZ-T is able to provide switching frequencies up to 1MHz and its micro-power mode naturally aligns with applications that require a low-ram usage.The tiny feature size enables high-density integration, providing relatively good thermal performance within limited board space.

The controller is also integrated with many features that increase the reliability and performance of the power stage.The synchronous rectifier, over-current protection (OCP) and over-voltage protection (OVP) provide reliable power delivery in harsh operating and thermal environments.The multiple start-up ramp options also suit it to applications with sensitive loads or large input-voltage differences.

Working Principle

The ISL9444IRZ-T uses Pulse Width Modulation (PWM) to modulate the power output.PWM is a process used to control the amount of power delivered to the output.The power is controlled by varying the width, or ‘on’ time of the output pulses. By increasing this on time the output voltage increases, and by decreasing it the output voltage decreases.

The pulse-width modulation is performed by comparing the voltage at the output with a reference voltage through a comparator circuit.This process also takes into account switching on losses, switching off losses, and the load.The output can be set either to a fixed range, or to a range determined by the voltage at the output. The ISL9444IRZ-T is able to support peak current limits, making it suitable for applications with large loads.

In addition, the ISL9444IRZ-T supports multiple start-up ramps. The method used depends on the specific requirements of the application.For a low-voltage application, the device can use a single-gate buck or boost converter, or a dual-gate buck-boost converter depending on the input and output characteristics.In addition, the device supports synchronous rectification and over-current protection (OCP) and over-voltage protection (OVP).

The ISL9444IRZ-T is a high-efficiency, single-gate, buck, boost or dual-gate buck-boost controller designed for low-voltage, low-power applications. Its on-board standing-wave repartition (SWR) controller makes it well-suited for working in wide range of applications and its multiple start-up ramps, including synchronous rectification, over-current protection (OCP) and over-voltage protection (OVP). improve the reliability and performance of the power stage.The tiny feature size enables high-density integration, providing relatively good thermal performance within limited board space, and its micro-power mode naturally aligns with applications that require a low-ram usage. The device is suitable for use in various applications such as mobile devices, tablets, digital TV, battery operated applications, data storage and point-of-load (PoL) converters.

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