LT323AT#PBF

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LT323AT#PBF is a three-terminal adjustable voltage regulator produced by Linear Technology. It is part of the company\'s range of integrated power management integrated circuits (PMICs), and is classified as a low dropout (LDO) linear voltage regulator. This type of voltage regulator is commonly used in applications where a small, lightweight, and low-noise power supply solution is needed. In this article we will look at the application field of the LT323AT#PBF, as well as its basic working principle.

Application Field

The LT323AT#PBF is a high-performance, dropout adjustable LDO linear regulator, designed for applications in mobile devices, portable personal digital assistants (PDAs), and similarly-sized devices. It is designed to operate on input voltages ranging from 2.7V to 20V, while output voltage range is adjustable from 1.2V to 18V. This makes it ideal for a wide range of low-voltage applications. Additionally, the device features low-noise operation, providing a maximum output noise of 4 μVRMS over a 10Hz to 100kHz bandwidth. This makes it suitable for applications in noise-sensitive environments such as medical, audio, and instrumentation systems.

The LT323AT#PBF is supplied in a space-saving 10-pin PBF package, which makes it a good choice for applications requiring a small footprint. The device also has a high temperature range, with a maximum operating temperature of +125°C, and can operate over a wide range of input voltages. It also provides a low dropout voltage of 300mV at 100mA, making it suitable for use in efficient, low-power systems.

Working Principle

The LT323AT#PBF is a linear voltage regulator. Unlike switching regulators, linear regulators rely on a series pass PMOSFET to control the output voltage. They do this by controlling the amount of current that is allowed to pass through the PMOSFET, and hence controlling the voltage at the output. This is done by controlling the PMOSFET gate voltage. The output voltage of the LT323AT#PBF is fine-tunable by adjusting the control voltage applied to the pin 3 with a voltage divider.

Another key feature of the LT323AT#PBF is its adjustable current limit, which is enabled by connecting a resistor from the current limit input pin (pin 4) to ground. This allows the current limit to be adjusted from 0.25 mA to 400 mA, ensuring the device is suitably protected from potential overloads.

Conclusion

The LT323AT#PBF is a low-dropout, adjustable voltage regulator from Linear Technology. It is designed for use in applications such as mobile phones, PDAs, and other portable devices. Its wide operating voltage range, low-noise operation, small package size, and adjustable current limit make it a versatile and reliable option. In summary, the LT323AT#PBF is a great choice for the design of electronic systems where a compact, low-noise power supply is required.

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