LM2673SD-12 Integrated Circuits (ICs)

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LM2673SD-12 Application Field and Working Principle

The LM2673SD-12 is a monolithic integrated circuit designed for DC-DC converters, providing a simple solution for low voltage, high current applications. This Power Management Integrated Circuit (PMIC) voltage regulator is optimized for step down (buck) conversion, and is a member of the LM2673 range of parts. It works with a wide 4.5V to 60V input voltage range, extending from 4.5V to 13V for reduced power loss applications.

The LM2673SD-12 has the ability to drive up to 5A of load current and can deliver up to 12V output voltage with a programmable output voltage setting. The device supports both PWM and PFM modes, allowing it to increase efficiency in both light and heavy load range. The device offers excellent performance, with peak efficiency of up to 94%. The part is designed to be used in DC-DC buck converters, with its internal switch offering a wide range of load current and input voltage.

Application Field

The LM2673SD-12 is ideal for a variety of DC-DC switching regulator applications. It can be used in a wide array of applications, including isolated power supplies, point-of-load converters, DC-DC buck converters, battery powered systems, and a variety of other applications in fields such as automotive, industrial, medical, and more. The device is also suitable for use in DC-DC flyback converters, where its minimum switching frequency of 80kHz offers good performance.

Working Principle

The LM2673SD-12 is based on a fixed frequency, PWM/PFM architecture, and utilizes a synchronous rectification technique to deliver high efficiency with low input current and low EMI. The internal switch is designed to automatically switch between PWM and PFM modes depending on the current load. At light load ranges, the device operates in PWM mode resulting in improved system efficiency.

The LM2673SD-12 is designed with a maximum duty cycle of 0.3, allowing it to be used with fast input voltage transients, offering seamless conversion from high to low output voltages. An integrated, adjustable current limit feature also allows the device to protect against over-current conditions.

The LM2673SD-12 offers a wide range of protection features such as thermal shutdown, reverse-current protection, over-temperature fault flag, under-voltage lockout and over-voltage protection. The part also has a low output voltage accuracy of ±2%, enabling a wider operating range and reliable results.

Conclusion

The LM2673SD-12 is a high-efficiency monolithic integrated PMIC voltage regulator optimized for step down (buck) conversion within DC-DC applications. With its wide 4.5V to 60V input voltage range, excellent performance and multiple protection features, the part offers a simple solution for powering a variety of applications such as isolated power supplies, point-of-load converters, and battery powered systems.

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