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DC-DC converter

A technology of DC converter and digital controller, which is applied in the direction of DC power input conversion to DC power output, high-efficiency power electronic conversion, output power conversion device, etc., which can solve the problems of increasing chip area and low conversion efficiency

Active Publication Date: 2009-04-08
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above-mentioned problem of low conversion efficiency and increased chip area by using an additional low-dropout voltage regulator when providing a common power supply for digital and analog circuits, the present invention proposes a variety of DC-DC converters that do not require additional low-dropout voltage regulators Devices and Power

Method used

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Embodiment Construction

[0019] In order to make the above and other objects, features, and advantages of the present invention more comprehensible, the preferred embodiments are listed below, together with the accompanying drawings, and are described in detail as follows:

[0020] FIG. 3A is a schematic diagram of a DC-DC converter according to an embodiment of the present invention. In FIG. 3A and FIG. 4A , L represents a low potential, and H represents a high potential. The DC-DC converter 300 includes an output stage 310 , a digital controller 330 and a control unit 350 . The output stage 310 includes a pull-up circuit 320 , a pull-down circuit 340 and a low-pass filter 325 . The pull-up circuit 320 includes a control terminal 311 and is coupled between a first fixed voltage PVDD (such as a power supply voltage) and an internal node 315 . The pull-down circuit 340 is coupled between the internal node 315 and a second fixed voltage PGND (eg, ground). Low pass filter 325 is coupled between intern...

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Abstract

The present invention provides a DC-DC converter providing a DC output voltage at an output node. The DC-DC converter comprises an output stage, a digital controller, and a controller. The output stage comprises a pull-up circuit having a control terminal and coupled between a first fixed voltage and a internal node, a pull-down circuit coupled between the internal node and a second fixed voltage, and a low pass filter coupled between the internal node and the output node. The digital controller is powered by the DC output voltage and adjusts the DC output voltage by controlling the output stage. The controller controls a connection of a feedback path, comprising the digital controller, between the output node and the control terminal according to the DC output voltage.

Description

technical field [0001] The present invention relates to DC-DC converters, and in particular to buck converters. Background technique [0002] Space constraints in electronic devices often do not allow the use of multiple batteries to power different components within the device, so DC-DC converters are ideal for mobile devices that receive power from batteries, such as mobile phones and laptops. important. [0003] In DC-DC converter design, conversion efficiency is usually one of the main considerations. DC-DC converters with digital control loops are gaining popularity due to their flexibility. Because of the programmable gain and loop bandwidth, it is easy to program the DC-DC converter according to different inductor-capacitor filters or switching frequencies. [0004] FIG. 1 is a schematic diagram of a prior art DC-DC converter with a digital control loop. The DC-DC converter includes an output stage and a digital controller. The output stage includes PMOS transist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/10H02M3/157
CPCY02B70/1466H02M3/1588H02M3/156Y02B70/10
Inventor 刘学欣徐哲祥
Owner MEDIATEK INC
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