LM79M05CT

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The LM79M05CT voltage regulator is part of the family of positive-negative (PN) linear regulators. It offers a wide input voltage range and is suitable for applications that require high current output voltage regulation. This regulator combines the features of both a low drop-out regulator, which allows operation with low input-output voltage differential, and a linear regulator, which offers low quiescent current. The LM79M05CT operates typically at less than 0.2Ω dropout voltage and provides output currents up to 1A, making it an ideal solution for applications where high efficiency is required but with a single-supply input voltage range. It is also ideal for small and medium power applications such as data terminals, palmtops and consumer electronic products.

The integrated low dropout feature allows the LM79M05CT to regulate a wide input voltage range from 3V to 50V and support a 3V to 17V output voltage range. External feedback and voltage adjustment components adjust the output voltage accurately. The LM79M05CT is available in TO-220 and SOP packages, with a minimum specified switching frequency of 400KHz to reduce external filter and noise requirements.

The LM79M05CT features a low device temperature rating, making it ideal for thermal sensitive applications. It also offers a wide ambient temperature range of –40°C to 85°C operation and short circuit protection with automatic recovery. In addition, the device offers thermal shutdown protection and output current limiting capabilities to further increase system reliability.

The LM79M05CT adopts the differential amplifier technique to regulate the output voltage with high accuracy. This technique works in conjunction with circuit components like a control switch, an error amplifier and a voltage divider. The control switch, typically a MOSFET, is integrated inside the LM79M05CT and is optimized to achieve high efficiency. A fraction of the reference voltage is fed as the control voltage to the error amplifier, which compares it to the feedback voltage. If a mismatch occurs, the error amplifier gives an error voltage output. This error voltage is then fed to the control switch and the error voltage is adjusted until the output voltage matches the reference voltage.

Overall, the LM79M05CT is an ideal voltage regulator that offers high efficiency, low dropout voltage, low quiescent current, a wide temperature range and short circuit protection. It is a reliable, cost effective and compact solution for small to medium power applications.

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