LM337TG

LM337TG application field and working principle

Linear Voltage regulators are a type of power supply that outputs an electrical signal of a regulated voltage regardless of input voltage or load fluctuations. The LM337TG is a linear voltage regulator that offers an adjustable output voltage from -1.2V to -37V, with a maximum output current of 1.5A. It is a 3-pin device that is available in a TO-220/D2PAK/SMD package.

Fields of Application:

• Adjustable voltage regulators
• Current regulator sources
• Reverse polarity protection
• Voltage references
• Telecom power applications, power supplies, computer power supply sources

One of the main advantages of the LM337TG is its compatibility with very low input voltages, making it an ideal choice for applications that require low voltage regulation. Furthermore, the low dropout voltage of the LM337TG makes it a suitable choice for power sensitive applications. Additionally, the device features a thermal shutdown and short-circuit protect feature that offers protection to the device from unwanted current spikes.

Working Principle:

The LM337TG is a classic three terminal linear voltage regulator and consists of an input pin, output pin, and a common ground pin. The device uses an internal voltage reference to regulate the output voltage, where the voltage difference between the input and output pin is known as a dropout voltage. The dropout voltage is dependent on the current provided to the device and the output voltage. The LM337TG has a dropout voltage of 2V, meaning that the input voltage must be at least 2V higher than the output voltage.

The typical output voltage can be adjusted by using an external resistor divider, which feeds back a reference voltage from the output of the device to the adjust pin. By adjusting the resistance of the divider, the output voltage can be adjusted from -1.2V to -37V. The LM337TG is capable of providing a maximum output current of 1.5A and offers short circuit protection, open collector output, and thermal shutdown.

In summary, the LM337TG is a linear voltage regulator that offers an adjustable output voltage range of -1.2V to -37V, with a maximum output current of 1.5A. This makes it an ideal choice for applications that require low voltage regulation, such as telecom power applications, power supplies, and computer power supplies. Furthermore, the device is equipped with an internal voltage reference, a low dropout voltage, thermal, and short circuit protection.