Multi-phase DC-DC converter

Abstract

A multi-phase DC-DC converter comprises an error amplifier, a control unit, at least two converters and a loop unit, and is characterized in that the control unit comprises an OPA amplifier, a first field effect transistor and a second field effect transistor; the positive phase input end of the OPA receives error amplification voltage VEA, the negative phase input end of the OPA receives reference voltage Vref1, and the output end of the OPA is connected with the drain electrode and the grid electrode of the first field effect transistor and the grid electrode of the second field effect transistor and feeds back output current I1 to the first field effect transistor. The source electrode of the first field effect transistor and the source electrode of the second field effect transistor are respectively connected with power supply voltage, and the drain electrode of the second field effect transistor is connected with one of the at least two converters and provides mirror image input current I2 for one of the at least two converters. Based on the technical scheme in the invention, the converter can realize smooth switching in the switching process of the light load working mode and the heavy load working mode.

Description

technical field [0001] The present invention relates to integrated circuits, and more particularly, to a multiphase DC-DC converter. Background technique [0002] At present, in an integrated circuit that requires a voltage converter, a multi-phase DC-DC converter can usually be used to reduce output ripple, that is, a voltage converter with multiple DC-DC converters is used for alternate operation. Further, when the load in the system is small, multiple DC-DC converters can be selected, some of the converters can be turned off, and other partial converters can be turned on to improve the working efficiency of the multi-channel DC-DC converter. . [0003] However, in the prior art, the output voltage of the multiphase DC-DC converter capable of switching between the light-load and heavy-load operating modes of the system may jump during the switching of the operating modes, thereby affecting the overall performance of the system. [0004] Therefore, there is a need for an ...

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Problems solved by technology

[0003] However, in the prior art, the output voltage of the multi-phase DC-DC converter capable of switching between the light-load and heavy-load operating modes of the system may jump during the switching operation mode, thereby affecting the overall performance of the system

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