S-1155B19-U5T1G

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S-1155B19-U5T1G Application Field and Working Principle

S-1155B19-U5T1G is a PMIC (Power Management Integrated Circuit) voltage regulator within the linear voltage regulator category. This type of PMIC differs from switching voltage regulators in that it uses linear topology, wherein the output voltage is the same as the input voltage minus a set voltage drop. Linear voltage regulators can be configured in various voltage configurations, hence they are mostly used in portable battery powered applications such as smartphones or other electronic gadgets. The S-1155B19-U5T1G is such a linear voltage regulator, used to smoothly step-down voltage to a desirable level.

S-1155B19-U5T1G Application Field

The S-1155B19-U5T1G is primarily used to step down voltage from a variety of input sources ranging from 3V to 22V. This regulator is well suited for applications with a wide range of operational power requirements. It is especially useful in portable battery powered applications, thanks to its low power consumption and high efficiency levels. This regulator can also be used in automotive, industrial, and consumer applications. Common applications of the S-1155B19-U5T1G include audio amplifiers, consumer electronics, digital still cameras, notebook computers, PDAs, portable consumer devices, portable data terminals, and point-of-sale terminals.

S-1155B19-U5T1G Working Principle

The S-1155B19-U5T1G operates on a voltage-controlled, non-synchronous switching linear regulator principle. It can be used in a single chip fixed-foldback regulator solution, wherein the output voltage will be the same as its input voltage but the current drawn from the input voltage is reduced. The output voltage of this regulator is set by changing sampling resistors, and the current-limit threshold of the regulator is set by controlling an external P-Channel MOSFET via the REF voltage. Depending on the output current demand, this regulator will either operate in dropout mode or in linear mode. In dropout mode, power is transferred from input to the output through the internal NMOS FETs, while in linear mode, power is transferred through the internal P-channel MOSFET.

The S-1155B19-U5T1G also features several protection mechanisms, such as Output Overvoltage protection, Load Monitoring and Thermal Shutdown protection. The Output Overvoltage protection will activate when the output voltage exceeds a certain preset level, while the load monitoring protection feature monitors output shorts and current overloads and will turn off the regulator if either one is detected. Last but not least, the Thermal Shutdown protection feature will shut off the regulator if the temperature of the integrated circuit\'s die exceeds its rated maximum temperature.

The S-1155B19-U5T1G is an efficient linear voltage regulator which is most suitable for portable battery powered applications. It boasts of a wide input range, high efficiency, fast transient response time and several protection mechanisms. It is suited for a variety of applications ranging from consumer electronics to automotive, making it very versatile and a popular choice in the semiconductor market.

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