NJM78L18UA

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NJM78L18UA, classified under PMIC - Voltage Regulators - Linear, is an adjustable output voltage 3-terminal positive regulator IC developed by New Japan Radio Co Ltd. It offers satisfying features and functionalities that make it suitable for various applications. This article will briefly introduce the application field and working principle of NJM78L18UA.

Application Field

NJM78L18UA is an adjustable output voltage regulator with a wide range of applications. It can be used as an adjustable voltage regulator for any desired voltage from 1.2V to 18V, which makes it applicable for a broad range of purposes. Some of these include automotive applications and battery powered devices. Thanks to its power consumption and small size, NJM78L18UA can be an ideal voltage regulator for automotive systems, multimedia devices, and portable electronic devices.

NJM78L18UA is also suitable for use in battery powered, high-efficiency and low-power consumption applications. It can provide regulated power supply to microprocessors and other programmable circuits to ensure high stability and accuracy. Furthermore, it can be used in charge pump circuit to generate high load current, which makes it suitable for applications such as boost converters, timer circuits, and waveform generators.

Working Principle

The NJM78L18UA operates based on an internal circuit that consists of an input voltage sense circuit, an error amplifier circuit, and an output control circuit. It is able to deliver regulated output voltage while taking input voltage of 1.8V to 18V, assuming input dissipation of 250mW. It offers dissipated power of 0.5W max, with a temperature range of -50°C to 105°C.

The NJM78L18UA adjustable output voltage regulator follows the classical technology of negative resistance for current supply. The error amplifier circuit is constructed with PNP and NPN transistors that pass reference voltage to the output voltage. The output resistor connected to the output terminal supplies current by negative temperature coefficient. This provides robust performance to the device.

The input voltage sense circuit provides output voltage stability and accuracy. It gives voltage gain and voltage feedback based on the input voltage, even at low power supply inputs. The output control circuit provides the necessary control and detection frequency to maintain the accuracy of output voltage. Therefore, it allows the device to deliver current up to 100mA, while consuming low power and temperature.

Conclusion

NJM78L18UA is an adjustable output voltage regulator IC developed by New Japan Radio Co Ltd. It is ideal for automotive systems, multimedia devices, and portable electronic devices, as well as battery powered, high-efficiency, and low-power consumption applications. The NJM78L18UA follows the classical technology of negative resistance for current supply, and its input and output circuits are designed to operate with great accuracy and stability. With all its desirable characteristics, NJM78L18UA is a reliable voltage regulator for a broad range of applications.

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