S-1721A1228-I6T1U

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Modern electronic systems have a range of different power requirements and rely on PMIC (Power Management Integrated Circuits) to monitor and control the power supply. Linear voltage regulators are the most basic but important power management components, providing voltage control, stability and efficiency. The S-1721A1228-I6T1U is a linear voltage regulator designed for SMPS (switched-mode power supply) applications, providing a wide range of output voltages from 2.5V to 5.5V. This article will explore the S-1721A1228-I6T1U application field and working principle.

The S-1721A1228-I6T1U is a triple-output linear voltage regulator suitable for SMPS applications. It integrates two low dropout (LDO) linear regulators and one switchable LDO/buck-boost converter into a single package. The first two LDOs supply fixed output voltages of 2.5V and 3.3V, and the third output is adjustable via a voltage divider and external resistor. This output can be switched between LDO and buck-boost mode to accommodate multiple input voltages, supporting output voltages from 2.5V to 5.5V.

The S-1721A1228-I6T1U allows for flexible input voltage regulation, meaning that power supply design can be made simpler and more efficient. The switchable LDO/buck-boost converter enables voltage scaling to fit a wide range of output power requirements using a single device. In addition, its wide input voltage range provides increased design flexibility and operation across numerous applications such as switching power supplies, LED lighting, and Set Top Boxes (STB).

The S-1721A1228-I6T1U also provides a number of added benefits. Two separate logic-controlled enable pins give more control over the device and allow for more efficient power management. Its current limit feature helps to protect the device and load in the event of an overcurrent, while the thermal shutdown function ensures the device does not overheat. Other features include power good indicator, UVLO (under voltage lock out) detection, and transient protection for externally supplied outputs.

The S-1721A1228-I6T1U implements a typical linear regulator topology. It has a series pass device (transistor) with a feedback loop that drives a precision reference voltage. Temperature, line and load transients are compensated for in the feedback loop, ensuring a stable output voltage regardless of input variations or load changes. The output voltage is controlled by the input/feedback network which regulates the base-emitter junction voltage of the series pass transistor. This voltage sets the voltage difference between the input and output, resulting in a linear relationship between the input and output.

The S-1721A1228-I6T1U is a feature-rich linear voltage regulator designed for SMPS applications. It provides adjustable output voltages ranging from 2.5V to 5.5V, with two selectable LDOs and a switchable LDO/buck-boost converter. It also offers optimized power savings and superior protection features, making it an ideal choice for a wide range of applications. With its excellent performance and reliable operation, the S-1721A1228-I6T1U is sure to be an attractive option for any SMPS design.

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