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Introduction

NCP81148MNTWG is a voltage regulator with both linear and switching techniques for applications. This voltage regulator is a member of the NCP Single-Channel (SC) synchronous buck family. It integrates a VBUS power FET, an error amplifier, an NCP driver FET, an integrated compensation network, as well as two current sense resistors for current regulation.

Features

The integrated VBUS power FET allows for the NCP81148MNTWG to support a load range from 0.14A to 6.30A or a range from 0V to 4.5V, in constant-voltage regulation mode. The output current and voltage are programmable, with the adjustment time being dependent on the frequency. A PGOOD output is also available for 5V power-up detection and system monitoring.

The NCP81148MNTWG features a host of integrated features that make it an ideal choice for a variety of applications. These include the ability to start up to 4.5V bus input voltage with an active current limit, a thermally improved power FET that can withstand overloads up to 7.5A, an adjustable soft-start/soft-stop delay to minimize power supply stress, as well as current limit and thermal protection.

Applications

The NCP81148MNTWG is a suitable choice for numerous unregulated voltage applications, such as devices powered from a 12V or 24V bus, car/wall adapter applications, as well as laptop and table computers. It is also suitable for point-of-load applications, such as DIMM memory, FPGA/ASICs and peripheral devices, for computer motherboards.

Working Principle

The NCP81148MNTWG operates on a Linear+Switching principle. In this principle, the linear portion regulates the output of the voltage regulator. The linear regulator takes its input from the output of the switch and adjusts the voltage to the desired output level. On the other hand, the switching portion of the regulator takes its input from the output of the linear regulator and sets the gain of the power converter. This ensures that the output voltage is consistent with the input voltage.

The NCP81148MNTWG also features an integrated driver FET and an internal compensation network for the buck converter. This allows for the device to quickly respond to any change in the input voltage or output current. The device also has current limit protection and over-temperature protection, to ensure that it stays within safe operating parameters.

Conclusion

The NCP81148MNTWG is a versatile voltage regulator that combines the advantages of both linear and switching techniques for applications. With its wide input voltage range and high output current, the NCP81148MNTWG is suitable for various unregulated voltage applications. Furthermore, it features an integrated driver FET, compensation network and current limit protection, making it an ideal choice for the design of power supplies.

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