LM338 MWC

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LM338 is a monolithic integrated circuit made with DMOS process, which is one of the most common and widely used integrated voltage regulator composed of N-channel MOSFET to achieve precise output voltage regulation. It includes a temperature compensated band gap voltage reference, an error amplifier, a common emitter current amplifier, a precise voltage regulator, and a current limiter block. LM338’s purpose is to maintain precise DC voltage levels for a wide range of voltages and currents.

LM338 has an operational temperature range from -55°C to +125°C. Therefore, the device can be used in any environment. LM338 has an input voltage range from 4V to 40V, which is an ideal feature for automotive and motor control applications. The output voltage range is from 1.25V to 37V, with an accuracy of 0.5% over the whole temperature range. LM338’s maximum output current is 5A, which provides enough current for many applications. It also has short-circuit protection.

LM338 has a wide range applications. It can be used in a voltage regulator, adjustable power supply, current-limiting circuit and thermal controller. In voltage regulator applications, LM338 can finely control the output voltage to achieve the desired output voltages. If you need to adjust the output voltage, then you can use the adjustable high precision voltage reference, which is another feature of the LM338. Although it has a large temperature coefficient, it has a wide temperature operating range and can maintain a high accuracy output voltage.

In addition, LM338 is suitable for motor control and automotive applications. With LM338, the output voltage follow the input voltage in order to precisely control the motor speed. Moreover, it can provide sufficient current for many kinds of inductive loads, such as relays and solenoids. Moreover, the device has a built-in over-current protection fault signal that can protect the circuit from destorying.

The working principle of LM338 is simple. It uses a differential amplifier to compare the voltage between the setting voltage and the output voltage. When the two voltages are different, the differential amplifier will produce an error signal and cause an output voltage adjustment. The non-inverting end of the differential amplifier is connected to the adjustable reference voltage. The reference voltage will adjust the output voltage until it matches the preset voltage. The whole circuit is closed loop controlled.

The LM338 is the right choice when you need a precise voltage regulator in a wide range environment. It has a wide operational temperature range, precise output voltage accuracy and current limiter protection that make it a perfect fit for many applications. With its low price and reliable performance, it has grown to become one of the most important components in many applications.

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