AP1122EL-13

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Linear voltage regulators (LDOs) are an important component of most power management integrated circuits (PMICs). They are commonly used to support dependable and consistent power delivery to application circuits and system components. The AP1122EL-13 is an IC that is specifically designed to meet the need for a high-performance and adjustable linear voltage regulator. This article defines AP1122EL-13\'s application field, as well as its working principle.

Application Field

The AP1122EL-13 (or AP1122EL-13T) is a precision, low dropo ut, adjustable voltage regulator IC. This IC is designed specifically for communications, mobile computing, and digital multimedia applications, with the primary application being 5V-to-2.8V power conversion. This IC also provides an adjustable output voltage for applications requiring very low power or very low voltage supplies, such as low-power FPGAs, CPLDs, ASICs, low-current ADCs, and other low-power analog circuits used in automotive, industrial, and telecom applications. Precise adjustment of the output voltage is possible thanks to the AP1122EL-13\'s ratiometric output pin feature.

Working Principle

The AP1122EL-13 IC is a Linear Regulator (LDO) with a power transistor that provides power output. Its regulating principle is based on the difference between input and output voltages, and uses a feedback control system to control the power transistor to maintain the output voltage (Vo). In order to ensure high accuracy of the output voltage, an internal error amplifier is provided, whose gain is calculated by the feedback resistance ratio. This input is a voltage signal which is calculated by comparing the output voltage with the voltage reference, and the output signal is used to control the power transistor to adjust the output voltage. The input voltage is filtered by an internal LPF, then is amplified by an error amplifier and is compared with the internal voltage reference. The output voltage is varied according to the results of the comparison.

The AP1122EL-13 IC also includes other features that enable optimal power conversion. These include an enable pin, a soft-start circuit, overload protection, thermal shutdown, current limit protection and an external power-on reset. The enable pin can be used to control the operating mode of the AP1122EL-13, allowing it to be easily turned on or off. The soft-start circuit is used to limit the inrush current on startup and help the IC to remain in thermal balance. The overload protection circuit prevents malfunctions by monitoring the output current and cutting off the power supply in case the current exceeds the specified limit. The thermal shutdown circuit monitors the IC’s temperature and shuts off power when the temperature rises above the specified limit. Finally, the current limit protection circuit monitors the current draw and shuts off the supply when it exceeds a predefined limit.

The AP1122EL-13 is an IC specifically designed for low dropout regulation, with high accuracy and fast transient response. This feature-rich IC provides an easy, cost-effective solution to reliably convert a 5V input voltage to2.8V with adjustable precision, and is ideal for a variety of applications.

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