L6986FTR

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The L6986FTR is a P-channel Power MOSFET with integrated driver and synchronous rectified buck converter. It is one type of DC/DC switching regulator, which belongs to the family of voltage regulators. Its application field and working principle will be discussed in detail in the following sections.

Application Field

The L6986FTR is designed to provide a current up to a maximum of 4A and adjusts the output voltage from 0.8V to 2.5V. This makes it suitable for a variety of applications from post-regulation for non-isolated DC/DC converters to primary regulation for PCs. It can replace cumbersome linear regulators for post-regulations of buck or SEPIC converters, thus enabling the elimination of electrolytic capacitors. The device mostly finds its application in various types of power conversion and management designs, such as white goods, industrial, automotive and RF systems.

Working Principle

Under normal operating conditions, the voltage across transistor\'s drain and source pins is adjusted with the combination of a primary-side MOSFET and SO-802 driver (UDRV). This allows the device to achieve high efficiency and fast transient response with low energy losses.The gate voltage of the primary MOSFET is internally clamped in order to protect the device from exceeding its breakdown voltage. When compared to conventional bipolar transistor switch regulators, the L6986FTR performs the same function with two timesaving features. First, the integrated SO-802 driver (UDRV) takes care of the protection against short circuits and allows for protection against over current. Second, an internal current sense comparator monitors the output voltage across the voltage feedback resistor and results to limited peak current, thanks to the current artificial limitation during switch ON.In addition, the driver features a built-in programmable soft start, which helps to limit inrush current on system start-up and prevents over-loading of the downstream components. The following flow chart explains the regulation principles of the L6986FTR DC/DC regulator:

In summary, the L6986FTR is a P-channel Power MOSFET with integrated driver and synchronous rectified buck converter, and it is one type of DC/DC switching regulator belonging to the family of voltage regulators. Its application field comprises of various power conversion and management designs, and its working principle is based on the combination of a primary-side MOSFET and SO-802 driver, featuring a built-in programmable soft start.

The features of the L6986FTR such as high efficiency and fast transient response with low energy losses, combined with its ability to replace linear regulators for post-regulations, make it suitable for a variety of applications from post-regulation for non-isolated DC/DC converters to primary regulation for PCs.

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