ISL91133IIQZ-T

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DC DC Switching Regulators

Switching regulators have become increasingly popular as power management solutions for a variety of applications, from high-current, high-frequency applications such as portable electronic devices, to precision laboratory instruments. A wide range of switching regulators exists and voltage regulators are one type of this family. The ISL91133IIQZ-T is a 1A integrated low dropout (LDO) linear regulator with adjustable output voltage from 0.8V to 4.5V, that offers guaranteed accuracy and excellent power supply rejection ratio (PSRR).

ISL91133IIQZ-T Application Field

The ISL91133IIQZ-T is an ideal device for applications such as battery-powered equipment, portable instruments, PCs, and automotive systems. This particular switching regulator is one of the most versatile linear regulators on the market, with a wide range of features, performance and world-class protection technology. The ISL91133IIQZ-T is capable of providing the high level of precision and low noise required by the most demanding applications.In particular, its low output voltage (<0.8V) makes it well suited for powering very low power systems such as CMOS logic ICs and LCD touchscreens, as well as any other low power device requiring precise power regulation. The adjustable output voltage range allows customers to precisely adjust the voltage to match the needs of their application, enabling improved efficiency, higher levels of system design flexibility, and better cost management. It is a high current device with output low dropout voltage (0.3V) and excellent power supply rejection ratio (PSRR) for better application performance.

ISL91133IIQZ-T Working Principle

The ISL91133IIQZ-T is a low dropout (LDO) linear voltage regulator that utilizes a high precision voltage reference as the voltage reference. Its working principle is simple; by connecting a precision voltage reference to the control loop and utilizing feedback to adjust the output voltage, the regulator is able to maintain the output voltage at an exact level.The precise output voltage is set by an external voltage divider, or an internal resistor network, which provides a precise voltage level to the reference terminal of the regulator. The output voltage is then adjusted automatically by the feedback loop to match the reference voltage. As the reference voltage changes, the voltage regulation circuit responds by adjusting the output voltage to match.

The ISL91133IIQZ-T employs a “LDO” architecture; that is, the input voltage is applied across a P-channel power MOSFET. When the output voltage drops below the regulated voltage, the P-channel has to draw current into the output until the regulated voltage is reached. The on-resistance of the P-channel is therefore a critical factor in determining the efficiency, power loss and thermal characteristics.

The ISL91133IIQZ-T is highly reliable and is designed to protect itself and the load from possible damage from current, voltage or thermal overload due to input voltage and load current changes. It also has protective circuits built in to detect under-voltage and over-voltage conditions.

The ISL91133IIQZ-T is a powerful solution for a wide range of applications, from consumer electronics to portable medical and industrial applications, that require precise, reliable power regulation. With its adjustable output voltage, low dropout voltage, and excellent power supply rejection ratio, it is capable of providing high-precision power in an extremely compact package, offering customers a high level of flexibility and performance.

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