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LM337IMPX Application Field and Working Principle

PMIC - Voltage Regulators - Linear

The LM337IMPX from Texas Instruments is an adjustable negative voltage regulator. It is designed to provide an accurate voltage output with either a line or load regulation of low temperature coefficients. It features an adjustable voltage range from -1.2V to -37V, with a guaranteed input voltage ranging from 4.5V to 28V. This device is designed and tested to meet a variety of operational needs, such as providing a regulated power supply for audio amplifiers, regulated negative power supplies in automotive applications, and providing negative bias for IC’s operating from a +5V supply.

Features

• Adjustable voltage range of -1.2V to -37V
• Input voltage of 4.5V to 28V
• Output current of up to 1A
• Low temperature drift - 1mV/°C
• Guaranteed output accuracy of 0.5%

Working Principle

The LM337IMPX negative voltage regulator operates on the same basic principles as other linear voltage regulators. It has an input terminal, an output terminal, and an adjustment terminal. The input terminal is where the unregulated DC voltage from the power supply is applied. The output terminal is where the regulated voltage is supplied. The adjustment terminal is how the output voltage is adjusted. It is internally connected to a reference voltage, which is typically 0.6V or 1.2V. As the adjustment terminal is adjusted, the regulated output voltage changes in proportion. The output voltage is set by the voltage applied to the adjustment terminal and the reference voltage. The output voltage is equal to the reference voltage plus the voltage applied to the adjustment terminal.

The LM337IMPX also has built in regulation and protection features. The protection features ensure that the output voltage cannot exceed the adjusted value, and the regulation features help maintain the output voltage by compensating for any changes in input voltage or load current. The LM337IMPX also has a built in thermal shutdown circuit, which shuts down the output voltage if the junction temperature exceeds a certain point. This prevents the device from being damaged due to excessive heat.

Uses and Applications

The LM337IMPX is an ideal choice for applications that require a low noise, low dropout, adjustable negative voltage regulator. Its low current consumption and wide operating temperature range make it suitable for applications such as voltage-locked loops, audio amplifiers, LCDs, and various industrial control and communication systems. Additionally, it can be used to supply negative voltage to ICs that operate from a +5V supply. Its adjustable voltage range and guaranteed output accuracy make it an excellent choice for applications that require precise and reliable power.

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