LM2675MX-12

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The LM2675MX-12 is a high performance DC-DC switching regulator in SMD (Surface Mount Device) package which is commonly used in small, low power and space saving power supply applications. This device belongs to the PMIC (Power Management Integrated Circuit) family, specifically in the Voltage Regulators category, and the DC DC Switching Regulators sub-category. In this article we will explore the application fields and the working principle of LM2675MX-12.

Application Fields

The LM2675MX-12 is a monolithic switching regulator designed for low power applications. It offers an improved efficiency way to regulate an input voltage which is of 1.2V ~ 32V, and provides a regulated output from 0.8V ~ 31V. As such, this device is used in a variety of power supply designs for consumer electronics. These applications range from notebook computers and medical equipment, to consumer electronics, hand-held mobile devices, automotive electronics, and instrumentation. This step-down switch mode regulator can also be used as a current regulator to limit the current through a load.

The LM2675MX-12 offers automatic crossover-mode operation, which eliminates the need for capacitor snubbers or external resistors. It also provides internal overcurrent protection, temperature shutdown, and an adjustable current-limit protection. The device also has a built-in frequency fold-back circuit to limit the switching frequency under heavy load, which further reduces power dissipation in the device.

In addition to these features, the device includes a logic compatible shutdown pin, allowing the user to shut down the device with a logic low level. Further, the voltage regulation is accomplished using Pulse-Width Modulation (PWM) and by varying the duty cycle of the output pulses. The frequency of the pulses is adjustable and can be varied from 50kHz to 500kHz for optimal performance. The adjustable switching frequency also enables it to operate at higher power levels, while providing steady output voltage.

Working Principle

The LM2675MX-12 utilizes a peak current mode control architecture, which helps to provide a fast load transient response while at the same time maintaining regulation accuracy over line, load and temperature variations. The peak current mode control works by constantly monitoring the inductor current, and using it to determine the switch timing (i.e. on–time and off–time). As the load current increases, the switch on-time is correspondingly increased. Conversely, as the load current decreases, the switch on-time is decreased. In this manner, the output current is regulated and a stable output voltage is maintained.

The device utilizes a cycle by cycle current limit feature. This feature senses the inductor current at the beginning of each switching cycle, and compares it to a programmed threshold level. If the current limit level is exceeded, the device automatically turns off the switch and limits the output current. This feature provides a reliable, accurate and safe protection in an overload situation. Further, it provides a safe limiter if the operating conditions change, such as an increase in the output voltage due to a drop in the input voltage.

The LM2675MX-12 includes a built-in Under-Voltage Lock-out circuit (UVLO) which is used to prevent the device from operating when the input voltage is below the desired level. This is essential for keeping the device operating within its designed parameters and for maintaining stable operating conditions. The device also features a temperature shutdown circuit, which triggers an output shutdown to protect the device from excessive temperatures.

In conclusion, the LM2675MX-12 is a versatile, high performance DC-DC switching regulator which is commonly used in small, low power and space saving power supply applications. It offers an improved efficiency way to regulate an input voltage and provide a regulated output, and features a wide array of features such as an adjustable frequency, overcurrent and temperature protection, and under voltage lockout, making it suitable for a variety of power supply designs.

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