LT1963AET-3.3#30PBF

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The LT1963AET-3.3#30PBF is a component in the PMIC (Power Management IC) family of Voltage Regulators and comes under the Linear subcategory. It is a 3.3V fixed output, low dropout (LDO) linear voltage regulator which is suitable for battery-powered and regulation-oriented applications. The major benefits of using this particular IC are its high accuracy, low noise, and a very measurable quiescent current. This paper discuss the main application fields, general characteristics and its working principle.

Main Application Fields

The LT1963AET-3.3#30PBF is a general purpose regulator used in a wide range of applications, such as automotive, industrial, portable instrumentation, and consumer products in general. It is specifically suitable for low-power devices, such as digital audio players, handheld devices, PDAs, and cellular phones. It can also be used as a post regulator for switching supplies and in split supply configurations. Furthermore, thanks to its low dropout voltage, this component provides excellent regulation over a wide input range of 3 V to 20 V.

General Characteristics

Featuring an output current capability of up to 100 mA, the LT1963AET-3.3#30PBF is an efficient device which has a low dropout voltage at room temperature of only 350 mV for 100 mA load. It also has a typical quiescent current of 190 μA and a fully protected by current limit and thermal shutdown to ensure that no damage is inflicted to the device. Moreover, it consists of an output voltage accuracy of ± 2.5 % over line and load, and features a total output noise of only 10 μVrms/V output.

Working Principle

A standard solution for converting an input voltage to a different output voltage is to use a linear voltage regulator. This type of regulator reduces the input voltage to the desired output voltage using linear components such as resistors and transistors. Such linear voltage regulators achieve regulation by dissipating the excess energy of the input current in the form of heat.The LT1963AET-3.3#30PBF is simple, high efficiency, low-dropout linear voltage regulator with an adjustable output voltage of up to 3.3 V. It operates by placing a series pass element between the input terminal and ground as shown in Figure 1.

Figure 1: Working PrincipleWhen the input voltage is applied to the pass element, a current flows through the resistor and pulls down the voltage at the output pin to ground. This current is dependent on the value of the resistor, and thus can be adjusted to provide the desired output voltage. This current is dissipated as the load current flows through the pass element providing regulation of the output voltage.

The pass element is a high-performance P-channel MOSFET which can be used for accurate voltage regulation. The device also features an advanced design that minimizes the need for external components, and has excellent thermal characteristics, making it ideal for varying load currents and providing accurate output voltage.

The IC is designed to control the output voltage to a specified value and has a feedback control circuit to sense output voltage. An internal error amplifier is used to sense and compare the output voltage with a reference voltage. Depending on the difference between the two, the amplifier provides a signal to the gate of the pass element, which increases or decreases the load current accordingly. As a result, the output voltage is regulated to the desired value.

In conclusion, the LT1963AET-3.3#30PBF is a cost-effective, reliable, and accurate linear voltage regulator, suitable for many applications, such as automotive, industrial, consumer products, and specific low-power devices. It is a reliable, easy-to-use IC that is easy to install and configure. It provides all the features needed to implement linear voltage regulation in applications with a wide input voltage range and with excellent output voltage accuracy.

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