SG7805AT

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The SG7805AT is a well-known linear voltage regulator that can offer excellent output voltage stability and accuracy in a variety of applications. This device is widely used by engineers and hobbyists for a wide range of electronic projects. It\'s also commonly used in consumer electronics devices such as laptops, power supplies, TVs, and many more. In this article, we’ll explore the SG7805AT application field and working principle in detail.

What is PMIC?

PMIC stands for Power Management Integrated Circuit. It is a type of integrated circuit that is used to control and regulate the power management of various electronic devices. PMICs can be used to regulate voltage levels, reduce loss, and provide current limiting features. These features are necessary for system-level energy efficiency and reliability.

What is a Voltage Regulator?

A voltage regulator is an electronic device that can regulate the output of a power supply. It keeps the output voltage stable, even during changes in load current or input voltage. Voltage regulators are used in a variety of applications, from consumer electronics to industrial power systems. The most common type of voltage regulator is the linear voltage regulator.

What is the SG7805AT?

The SG7805AT is a 3-terminal fixed output linear voltage regulator. It can provide an accurate and stable output voltage of 5V with a 2% tolerance over the temperature range of -40 to +125°C. The SG7805AT is available in a TO-220 package and requires only two external components: a 0.1μF bypass capacitor and a 3.3Ω resistor.

SG7805AT Application Field and Working Principle

The SG7805AT is suitable for applications such as LCD panels, laser scanners, barcode readers, PDAs, digital audio players and more. It is also used in battery-operated products, automotive electronics, industrial control systems, computers and peripherals, and medical applications. With its low dropout voltage and low quiescent current, the SG7805AT is ideal for battery-powered applications.

The working principle of the SG7805AT can be broken down into three key stages. First, it senses the incoming supply voltage and adjusts its output voltage accordingly. Second, it uses an internal resistor divider and current source to maintain the output voltage within the specified range. Finally, it monitors the temperature of the device and will adjust the output voltage to maintain its accuracy.

When the input voltage is too high, the SG7805AT will use a series pass element, along with the internal resistor divider, to regulate the output voltage down. This pass element is typically a bipolar junction transistor, which works by regulating the output voltage using the base-emitter junction. If the input voltage is too low, the device will rely on the resistor divider and current source to regulate the output voltage up.

The SG7805AT is capable of providing reliable and accurate output voltage regulation. Despite its small size, it can handle up to 1.5A of output current and supports input voltages up to 32V. Furthermore, its low dropout voltage and quiescent current provides improved energy efficiency in power supply circuits. Its internal temperature protection and current limiting features also help ensure a safe and reliable operation.

The SG7805AT is a versatile and affordable device that can be used in a wide range of applications. With its low voltage drop and low quiescent current, it is an ideal choice for battery-powered applications. It is also suitable for industrial and automotive applications, thanks to its temperature protection and current limiting features. The SG7805AT can provide reliable and accurate voltage regulation, making it the ideal linear voltage regulator for a range of applications.

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