NCV1117DT18RKG

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The NCV1117DT18RKG is a low dropout regulator (LDO) of a linear voltage regulator (LVR) type. It is an ultra-small, wide input voltage range LDO designed for high current applications and is ideal for use in applications requiring 1.2V to 3.3V power sources.

The NCV1117DT18RKG is a monolithic three-terminal positive voltage regulator offering a very low dropout voltage, low output noise and low quiescent current. It has a wide input voltage range of 4.5V to 18V and a maximum output voltage of 3.3V with a ±2% accuracy. The output current that can be delivered is up to 150mA. This linear regulator features a fast transient response and a current-limit protection that prevents it from damaging the load. It is protected against reverse polarity and overvoltage.

In applications, the NCV1117DT18RKG is suitable for voltage-sensitive processor applications that require a low quiescent current and high accuracy voltage regulation. It can be used to interface a DC-DC converter, accepting a wide-range input voltage, and to step down the output to a smoother, programmable voltage. It is suitable for powering microcontrollers, TTL circuits, and other digital devices such as audio amplifiers, digital signal processors, telephone answering machines, and cordless phones.

The NCV1117DT18RKG features a 12µA current-limit circuit that turns on in the event of an overload and provides a continuously adjustable 0V to 4.5V current limit. The regulation pin controls the output voltage. The current limit pin adjusts the output current limit while the voltage control pin enables the user to adjust the output voltage from 0.6V to 4.5V within the input voltage range.

The working principle of the NCV1117DT18RKG is simple. It maintains a regulated output voltage by dissipating the difference between the input voltage and the output voltage in the form of heat. The input voltage is stepped down to the desired output voltage by the regulator circuit and the excess energy is released as heat. The voltage regulator circuit is composed of an output stage, which is an error amplifier, voltage reference, and pass element in various configurations.

The error amplifier monitors the output voltage using a feedback loop. If the output voltage rises higher than the reference voltage, the error amplifier forces the pass element to reduce the output voltage. Conversely, when the output voltage is below the reference voltage, the error amplifier turns on the pass element, increasing the output voltage. The output voltage can be programmed by setting the voltage control pin.

In conclusion, the NCV1117DT18RKG is a low quiescent linear voltage regulator designed for high current applications such as interfacing a DC-DC converter, powering microcontrollers, TTL circuits, and other digital devices. It features a wide input voltage range, low dropout voltage, low output noise, and a current-limit protection. It is suitable for adjusting voltage up to 0.6V to 4.5V with ±2% accuracy.

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