LTC3872HDDB-1#TRPBF

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The LTC3872HDDB-1#TRPBF is a voltage regulator in the DC to DC switching controller, or PMIC, category. It\'s a member of the LTC3871/LTC3872 family of high-performance switch-mode current-mode controllers that also features a VDD voltage regulator loop, high efficiency Linear Technology synchronous buck switching regulator controllers.

The LTC3872HDDB-1#TRPBF includes an integrated charge pump as well as several protection features and a low voltage/ high voltage shutdown. This synchronous DC to DC regulator offers excellent dynamic response and integrates an internal charge pump, enabling the fixed output voltage regulation independent of the input voltage noise.

The LTC3872HDDB-1#TRPBF is capable of providing up to 20 amps of output current from a wide input voltage range from 2.7V to 18V. It is also ideal for power management systems requiring a high efficiency and improved thermal performance. The part features an adjustable output voltage, programmable Soft-Start and current limit.

Applications for this device include distributed (point of load) power systems, telecommunications, solar energy systems, and industrial, medical, and portable applications. High power density DC/DC converters and non-isolated power supplies are also powered with it.

Working Principle of LTC3872HDDB-1#TRPBF

The LTC3872HDDB-1#TRPBF has a unique current-mode control architecture, so that it is able to accurately regulate an output voltage with no addition of external components. It combines the power of a synchronous buck regulator with its integrated charge-pump allowing for improved efficiency, low quiescent current, and controlled startup. Enhancing its efficiency is the power-optimized hysteretic control scheme and a wide range of frequency adjustability from 200kHz to 800kHz.

The LTC3872HDDB-1#TRPBF operates by pulse width modulating the 3 main power switches, the high side MOSFET, low-side MOSFET, and the Control Gate Synchronous Drive FET. By varying the pulse width of the 3 transistors, the converter is able to regulate the output voltage. The use of a synchronous buck eliminates any diode losses which would be present in a conventional buck converter thus offering a higher efficiency. The combination of current-mode control with a synchronous buck topology provides excellent dynamic response and when combined with the charge-pump, the LTC3872HDDB-1#TRPBF is able to regulate an output voltage independent of the input voltage noise.

The LTC3872HDDB-1#TRPBF also provides a multitude of protections features like input undervoltage lockout, output overvoltage protection, output short-circuit protection, and adjustable overcurrent protection.

Conclusion

The LTC3872HDDB-1#TRPBF is an ideal choice for high efficiency and excellent performance in distributed power systems, telecommunications, solar energy systems, and industrial, medical, and portable applications. With its high-performance current-mode Synchronous Buck controller and its integrated charge-pump, it is one of the top voltage regulators in the PMIC-DC-DC switching controller category.

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