LM79L12ACZ/LFT7

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The LM79L12ACZ/LFT7 is a 3-terminal, low dropout voltage regulator with overcurrent and short-circuit protection. It is part of a family of linear voltage regulators (PMIC – Voltage Regulators – Linear).

This device features an output voltage of 12V, an operating temperature range of −40°C to +125°C, and a maximum quiescent current of 25mA (typical). It also features undervoltage protection and current limiting, which make it ideal for use in a variety of applications, including low-voltage RF amplifiers and instrumentation.

Application Field

The LM79L12ACZ/LFT7 voltage regulator is suitable for numerous applications, including but not limited to:

• Low-power, low dropout regulator circuits
• RF amplifiers and instrumentation
• Supply voltage margins
• Driving bridge circuits
• Differential amplifiers
• Linear processing circuits

Working Principle

The LM79L12ACZ/LFT7 linear voltage regulator works on the principle that the output voltage is maintained at a constant level. The device uses an error amplifier for comparing the output voltage with an internal reference voltage. If the output voltage deviates from the reference voltage, the error amplifier generates an error signal which is used to drive the pass device of the regulator. The pass device can be either a n-channel or P-channel MOSFET or bipolar transistor.

The regulator is designed to work in the dropout mode which means that the output voltage will drop slightly below the reference voltage when the input voltage is close to the output voltage. This dropout mode of operation is desirable in some applications as it allows the output voltage to be tightly regulated even with a relatively low input voltage.

The device has built-in protection circuits to protect against overcurrent, overvoltage, and short circuit conditions. The device also features an undervoltage protection circuit which will shut down the output voltage if the input voltage is below a certain threshold.

Conclusion

The LM79L12ACZ/LFT7 is a low-dropout voltage regulator with overcurrent and short-circuit protection. It is suitable for a variety of applications, including RF amplifiers and instrumentation, and relies upon the principle of error amplifier regulation to maintain a constant output voltage. Built-in protection circuits ensure that the output voltage is maintained even when the input voltage is close to the output voltage and will shut down the output voltage if the input voltage is below a certain threshold.

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