Power transistor chip internally provided with enhancement metal-oxide-semiconductor field effect transistor (MOSFET) and applying circuit thereof

Abstract

The invention provides a power transistor chip internally provided with an enhancement metal-oxide-semiconductor field effect transistor (MOSFET) and an applying circuit thereof. The enhancement metal-oxide-semiconductor field effect transistor and two series resistors are matched with each other to be taken as a starting circuit of an AC / DC voltage switching circuit, so that the starting circuitcan be turned off and the insufficient of the supply voltage of a pulse width modulation circuit can be detected after the pulse width modulation circuit of the AC / DC voltage switching circuit normally works. Furthermore, the enhancement metal-oxide-semiconductor field effect transistor is arranged in the power transistor chip and can be made by adopting the same technology as the power transistor chip, so that the invention can not increase the additional mask and technology, thereby being capable of simplifying the technology and saving the cost.

Description

technical field [0001] The present invention relates to a voltage regulator (Voltage Regulator) circuit, and in particular to a power transistor chip with a built-in enhancement mode MetalOxide Semiconductor Field Effect Transistor (Enhancement Mode MetalOxide Semiconductor Field Effect Transistor, referred to as Enhancement ModeMOSFET) and the application of the chip AC / DC voltage conversion circuit. Background technique [0002] With the rapid evolution of semiconductor technology, such as computers and their peripheral digital products are also being updated day by day. In the integrated circuit (IC for short) of the computer and its peripheral digital products, due to the rapid change of the semiconductor process, there are more diversified demands for the power supply of the integrated circuit, so that the application such as booster (Boost Converter), step-down Various combinations of voltage regulator circuits such as buck converters can be used to meet the different...

AI Technical Summary

Problems solved by technology

However, no matter what method is used, the depletion-type metal-oxide-semiconductor field-effect transistor 221 or 331 is used as the AC / DC voltage conversion circuit of the start-up circuit. The channel (N channel or P channel) technology added by transistor 221 or 331 makes the chip technology more complicated

[0007] In addition, AC / DC voltage conversion circuits using different integration methods, such as US Patent No. 6,972,971, No. 5,014,178, and No. 5,285,369, etc., can respond to different design requirements. Circuits and power transistors are respectively integrated into a system chip with two chip circuits, or even integrated into the same chip circuit, but it still cannot provide brown-out detection for the power supply voltage of the pulse width modulation circuit, so It also appears to be insufficient

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