LM3754SQ/NOPB Integrated Circuits (ICs)

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The LM3754SQ/NOPB is a monolithic integrated circuit designed specifically for DC to DC buck (step-down) converter applications. It can deliver up to 1A continuous output current with excellent line and load regulation. Its 6V to 30V wide input voltage range and integrated high-side and low-side MOSFETs make it suitable for many general-purpose and automotive DC-DC converter applications.

The LM3754SQ/NOPB integrates a dedicated reference voltage circuit and advanced current mode control. The current mode control allows a fast control loop response with very good line and load regulation. With its wide input range, wide operating frequency range, excellent efficiency, and integrated features, the LM3754SQ/NOPB is well suited for a variety of buck converters.

Application Field

The LM3754SQ/NOPB is ideal for use in automotive accessories and systems as an on board dc to dc power converter. It is also used in general-purpose applications in computing, consumer electronics, telecommunications, automotive, and industrial applications. Typical applications include power converters for notebook computers and LCD TV systems, Li-ION battery charging systems, DC-DC converters for load leveling, low noise 12V to 5V and 5V to 3.3V converters.

Working Principle

The LM3754SQ/NOPB operates using a dedicated reference voltage circuit and advanced current mode control, allowing a fast control loop response with very good line and load regulation. When the input voltage exceeds the set regulation level, the internal MOSFETs turn off, and the inductor stores energy. When the output voltage falls below the set regulation level, the internal MOSFETs turn on again, and energy is released to the output. This process is continually repeated, allowing the LM3754SQ/NOPB to deliver a regulated output even with a varying input voltage.

The LM3754SQ/NOPB features a programmability range from 2.5mV to 40mV, making it suitable for high performance applications such as battery charging. Additionally, its typical On/Off time of less than 100 ns provides excellent EMI performance. The LM3754SQ/NOPB is available in a TSSOP-14 and a TSSOP-20 package, providing superior thermal performance and superior protection against dust and moisture.

Conclusion

The LM3754SQ/NOPB is an ideal PMIC for use in automotive and general-purpose DC to DC buck (step-down) converter applications. It integrates a dedicated reference voltage circuit and advanced current mode control that allows it to deliver up to 1A of continuous output current with excellent line and load regulation. Its wide operating voltage range, wide operating frequency range, excellent efficiency, and integrated features make the LM3754SQ/NOPB suitable for many different applications.

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