S-1112B51PI-L7KTFU

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The S-1112B51PI-L7KTFU is a highly advanced linear voltage regulator and is part of the S-1112 series of high-performance analog integrated circuits developed by ON Semiconductor. It provides a neat and cost-effective solution for many power management applications in various industries.

The S-1112B51PI-L7KTFU is a 3A, low-dropout (LDO) linear voltage regulator that supports up to 2A load current with small footprint FET output for low-dropout voltage accuracy and efficiency. With its very low 73mV dropout voltage and adjustable output voltage from 0.5V to 3.6V, the device is ideally suited for applications that require precision regulation of voltage with minimal headroom. It also incorporates an auto-discharge function for improved supply ripple rejection and improved transient load performance.

As an LDO, S-1112B51PI-L7KTFU offers several advantages over traditional switching regulators. It has a higher power efficiency rating than most switching regulators, even when operating at low output voltages. In addition, LDO regulators are generally more compact than their switching-regulator counterparts, making them well-suited for thousands of applications in areas constrained by size.

In terms of applications, S-1112B51PI-L7KTFU is used in power systems requiring low output voltage, such as LCD supply, battery signal management systems, portable medical appliances, and POE applications. Other applications include power supplies, cordless telephone and data communication systems, and power adapter systems.

The device features a simple working principle. When input voltage is greater than the desired output voltage, current passes through an internal P-channel FET and is diverted away from the output terminal, thus maintaining the required voltage. The P-channel FET also serves to reduce power consumption, since it reduces the output current when the input voltage is greater than the output voltage. The device’s voltage reference accuracy is ±1.2% over load and line. Additionally, its current protection feature prevents the device’s output current from exceeding 3A when a short circuit is detected.

In conclusion, the S-1112B51PI-L7KTFU is a versatile and cost-efficient linear voltage regulator with multiple features and applications. It offers high efficiency, low quiescent current, and enhanced transient-load performance. Thus, it is suitable for a wide range of precision power management and conversion applications.

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