LM2673T-ADJ/NOPB

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The LM2673T-ADJ/NOPB is a high efficiency, Step-Down switching voltage regulator with internal 3A, 0.5Ω switch. This device offer excellent line and load regulation, output noise suppression, and a high output current capability that makes it suitable for demanding applications such as notebook and DVD players. This regulator is part of Texas Instruments’ broad line of switching Step-Down regulators, referred to as synchronous DC/DC buck converters. The device is available in fixed packages, an adjustable version, and a low-pin count, extended temperature range versions in a QFN package.

This article focuses on the LM2673T-ADJ/NOPB application field and working principle. This device can be used in a variety of areas, including smartphones and battery-powered products. By properly selecting external components, this device can provide adjustable output voltages from 1.2V to 24V with a typical efficiency of 95%. In addition, the device offers a wide input voltage range of 2.7V to 40V, making it suitable for a number of applications. The device is also designed to run over a wide range of input/output conditions without requiring external compensation circuitry.

LM2673T-ADJ/NOPB application field and working principle can be divided into five components. First is the voltage divider, that is responsible for establishing the reference voltage VREF. This voltage is compared to an internal current source and the error voltage is amplified and used to control an oscillator. The oscillator\'s frequency is internally regulated to approximately 1.3 MHz. This is to minimize switching losses and reduce EMI.

Second is the driver, that takes the oscillator signal as its input and provides the gate drive to the external power switch. The switch is typically an N-channel MOSFET, and is used to connect the input voltage to the output. The average current into the switch is controlled so that the output voltage is regulated to VREF. One of the advantages of using an N-channel MOSFET as the power switch is that it can be switched on and off very quickly, allowing for a higher switching frequency and higher efficiency.

Third is the current limit circuit, which monitors the current in the output voltage sense resistor and shuts down the system if the current exceeds a given limit. This prevents damage to the system due to overcurrent conditions. The current limit can be user-adjusted, making it suitable for use in a variety of applications.

Fourth is the power good detector, which monitors the output voltage and signals when the voltage is below, or is rising above, a specified voltage. This signal is used to shut down power to the load when the supply is below a certain threshold. This is especially useful in applications where the output voltage is critical, such as in communications devices.

Finally, the fifth component is the thermal shutdown circuit, which monitors the die temperature and shuts down the system if the temperature exceeds a given limit. This is especially important to protect the system from long-term damage due to excessive heat.

In conclusion, the LM2673T-ADJ/NOPB is a high efficiency, Step-Down switching voltage regulator that is suitable for demanding applications such as smartphones and battery-powered products. By properly selecting external components, this device can provide adjustable output voltages from 1.2V to 24V with a typical efficiency of 95%. Its wide input voltage range of 2.7V to 40V and integrated features such as current limit, power good detection and thermal shutdown make it an ideal choice for a wide range of applications.

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