MC78LC18NTR

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The MC78LC18NTR is an integrated linear voltage regulator used in a variety of power management applications. It provides precise voltage management of an input voltage source and is designed for applications requiring low quiescent current, a low drop-out voltage, and low noise output. The MC78LC18NTR is a three-terminal adjustable linear voltage regulator that operates from an input voltage in the range of 3 to 25 volts. It provides output current limiting, overvoltage protection, thermal shutdown, and current fold-back for enhanced protection. The MC78LC18NTR is available in various packages and offers various output voltage options.

Applications

The MC78LC18NTR is widely used in a variety of power management applications such as: portable audio/video equipment, telephones, Digital terrestrial TV (DTT), wireless data communication equipment, automotive electronics, and many other consumer electronics.

Working Principle

The MC78LC18NTR is a three-terminal, adjustable voltage regulator that operates from an input voltage in the range of 3 V to 25 V. It regulates the input voltage to a precise reference voltage by a feedback mechanism. The integrated circuit uses internal current limiting, thermal shutdown, and current fold-back for enhanced protection. The user can program the output voltage of the regulator by connecting an external resistor divider between the output and the adjust terminal. By connecting the divider to ground, the output voltage can be adjusted from 3.2 V to the input voltage, minus a 2-volt dropout.

The MC78LC18NTR features an active low enable signal with a logic level input which is used to control the output voltage on/off. When the enable input is high, the output voltage is switched on. When the enable input is low, the output voltage is switched off. The enable signal is connected to an internal pass transistor which limits the output current. The device can withstand voltage spikes and transients up to the point at which the overvoltage protection device (OVP) will activate. At that point, the output is internally disconnected from the input to protect the device from shorts and overvoltage damage.

The MC78LC18NTR also features a low quiescent current, a low drop-out voltage, and low noise output. The low quiescent current makes the device suitable for battery-powered applications which need to operate for more than 500 hours on a single charge. The low drop-out voltage ensures that the output voltage is well regulated, even with an input voltage that is close to the programmed output voltage. The low noise output ensures that the device remains stable and reliable under all operating conditions.

Conclusion

The MC78LC18NTR is a three-terminal, adjustable voltage regulator that provides precise voltage management of an input voltage source. It is widely used in a variety of power management applications, such as portable audio/video equipment, telephones, wireless data communication equipment, and automotive electronics. The MC78LC18NTR features an active low enable signal with a logic level input which is used to control the output voltage on/off. It also features a low quiescent current, a low drop-out voltage, and low noise output, making it suitable for battery-powered applications.

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