LM317LZ

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The LM317LZ is a three terminal adjust linear regulator. It is designed to provide a constant regulated output voltage of 3.0 to 37 volts with a maximum output current of 1.5A. The LM317LZ is a single monolithic integrated circuit and is available in a wide range of package styles, including through-hole SOT-89, DPAK, D2PAK, SO-8, and TO-92.

Application Field of LM317LZ

The LM317LZ is designed for a wide variety of applications that require a regulated output voltage, but the most common uses are portable electronic devices such as cell phones, digital cameras, PDAs and other handheld devices. The LM317LZ is also well suited for use in desktop computers and other equipment that requires a regulated power supply.

Other typical applications of the LM317LZ include battery-powered equipment, inverters, as adjustable power supplies, and for circuit protection. It is also used as a current regulator for a variety of electronics projects. Because of its low dropout voltage and small size, the LM317LZ is perfect for applications that require a high degree of precision and portability.

Working Principle of LM317LZ

The LM317LZ is a voltage regulator that uses an internal voltage divider network to provide a precision regulated output voltage. Output voltage can be adjusted over a range of 3.0 to 37 volts by varying the applied input voltage and the resistance across the output terminal. The output voltage is divided by the reference voltage of the regulator (3.3 volts) and the resistors connected across the output of the regulator.

When the output voltage is at its minimum, the feedback pin of the regulator is pulled to the lower reference voltage and the control element operates in its linear region. As the output voltage increases, the feedback pin is pulled to the higher reference voltage and the control element operates in its saturated region. The output voltage of the regulator is determined by the reference voltage, the ratio of the resistors connected across the output and the applied input voltage.

The LM317LZ is designed to provide current limiting, thermal limiting and short-circuit protection. The thermal limiting feature reduces power dissipation by limiting the output current in the event that the device becomes too hot. The short-circuit protection feature prevents the regulator from supplying excessive current to the output in the event of a short circuit. In both instances, the output of the regulator will be shut off, thus preventing damage to the device or the application.

Conclusion

The LM317LZ is a three terminal adjustable linear voltage regulator. It has a wide range of applications, primarily in portable electronic devices, and can also be used in desktop computers and other equipment that requires a regulated power supply. The LM317LZ has protection features such as current limiting, thermal limiting, and short-circuit protection and is designed to provide a constant regulated output voltage.

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