LTC3872IDDB#TRPBF

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

LTC3872IDDB#TRPBF: Application Field and Working Principle

The LTC3872IDDB#TRPBF is a monolithic DC-DC synchronous buck switching controller designed to maximize flexibility and ease of implementation for portable, low-power applications. It is part of the Power Management & Motor Control (PMIC) products from Linear Technology and falls under the Voltage Regulators and DC-DC Switching Controllers categories. This article will explain the application field of the LTC3872IDDB#TRPBF and its working principle.

Application Field

The LTC3872IDDB#TRPBF is primarily used to provide a regulated power supply with minimal power losses in applications that require a high-efficiency and low-noise power management solution. It is particularly suitable for single-cell Li-ion/Li-polymer battery-powered mobile and portable applications. Other areas of application include automotive, communication systems, medical equipment, and point-of-load power supplies.

The LTC3872IDDB#TRPBF is also designed for a low-noise, switch-mode precision power supply. It can provide output voltages up to 12V and up to 6A of continuous output current. Additionally, the device features a built-in compensation RC network and provides a high level of design flexibility with adjustable voltage output, soft start, and several advanced features such as pre-biased output protection and low-battery detection. The integrated PLL helps with synchronization and reduces the system\'s noise and electromagnetic interference.

Working Principle

At the heart of the LTC3872IDDB#TRPBF lies a synchronous buck switching converter, implemented as a flyback topology. It consists of an inductor-inductor transformer that switches at high frequencies, allowing for a power conversion efficiency of up to 94%. The integrated maximum duty cycle control allows for an output voltage that is independent of input voltage and temperature.

The controller is powered by an external PMOS FET and a reference voltage. The MAX-duty cycle control internally sets the external PMOS’s duty cycle proportional to the FB voltage and the output voltage. The output voltage can be adjusted using the external ‘FB’ voltage of the buck converter’s output. The external PMOS FET is turned on and off in order to regulate the output voltage. The maximum duty cycle setting allows for a lower output voltage when using higher input voltages.

The operating frequency of the switching converter is managed by a phase-locked loop (PLL). A PLL compares the frequency of an input reference signal with the switching converter\'s output. When the switching frequency rises, the PLL increases the duty cycle of the PMOS FET at a rate predetermined by the phase-locked loop\'s loop filter. This regulates the switching frequency and helps improve the system\'s efficiency and noise reduction.

The controller also features pre-biased output protection, low-battery detection and soft start control. The pre-biased output protection limits the current flowing through the external components. The low-battery detection minimises stress on the components during power-down. The soft start control limits inrush current when the system is powered on.

Conclusion

The LTC3872IDDB#TRPBF is an efficient, low-noise DC-DC synchronous buck switching controller that is suitable for use in various applications, such as portable and mobile devices, communication systems, automotive equipment, and point-of-load power supplies. Its advanced features, such as pre-biased output protection, low-battery detection, and soft start control, make it a reliable and versatile power management solution.

The specific data is subject to PDF, and the above content is for reference