S-1133B29-U5T1U

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Linear voltage regulators are one of the most popular and widely used power management integrated circuit (PMIC) devices in the industry. They are used to convert or modify an incoming voltage to an output voltage, usually either fitting a voltage level or regulating a voltage line against external disturbances. In addition, linear voltage regulators provide overcurrent protection, thermal protection, and current limiting. The S-1133B29-U5T1U is an example of a linear voltage regulator and its application field and working principle are discussed in this article.

Application Field

The S-1133B29-U5T1U is a low drop-out (LDO) linear voltage regulator. This means that it maintains a low output voltage drop even when the input voltage is slightly lower than the output voltage. It can support a wide range of input voltage ranges, from two-point-five volts to eighteen volts. The device was designed to support low power loads, such as audio amplifiers, digital-to-analog converters, and control circuits, in environments with as much as 3A of current. It features a low output noise and excellent line and load regulation. The device also offers a low stand-by current, enabling low power consumption when the device is in an idle state.

Furthermore, the S-1133B29-U5T1U features a wide power supply transient response and good temperature stability, enabling it to be used in applications with varying temperatures and voltages. It is also equipped with a power ground pin to protect against EMI and ESD, allowing for robust operation and ensuring no interference with other components and systems. Lastly, the device includes a PGOOD pin, which informs the system whenever the output of the device is within regulation or not.

Working Principle

The S-1133B29-U5T1U provides efficient voltage regulation by controlling an external pass transistor, in this case a N-Channel MOSFET, to regulate the desired output voltage. The output voltage is compared to the bandgap reference voltage, which adjusts itself to be the same voltage as the output. This allows the passage of current between the input and output of the device. As the load current increases, the reference voltage decreases. This decreases the gate voltage of the N-Channel MOSFET and more current is allowed to pass, to keep the output voltage at the desired value.

The device also features protection functions such as overcurrent limit and thermal overload protection. The overcurrent limit monitors current through the external pass transistor to detect overload conditions and shut down the device. The thermal overload protection prevents excessive power dissipation, which could cause damage to the device.

Overall, the S-1133B29-U5T1U is a low power, low drop-out linear regulator. It is well-suited for applications requiring low power, noise and good transient response. Its wide input voltage range, excellent line and load regulation, low stand-by current, and protection features make it an excellent choice for many applications.

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