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Charge pump regulator and method for generating regulated voltage

A charge pump and regulator technology, applied in the direction of conversion equipment without intermediate conversion to AC

Active Publication Date: 2011-03-30
RICHTEK TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this way, the series resistance at the input increases, thereby increasing energy consumption and reducing the efficiency of the charge pump regulator.

Method used

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  • Charge pump regulator and method for generating regulated voltage
  • Charge pump regulator and method for generating regulated voltage
  • Charge pump regulator and method for generating regulated voltage

Examples

Experimental program
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Embodiment Construction

[0069] figure 1 It is a 1 / 2 times boost-type charge pump regulator, including a charge pump 10 connected between the input terminal 12 and the output terminal 14, and an output capacitor 16 connected between the output terminal 14 and the ground terminal GND Between, and other control circuits used to operate the charge pump 10. The feedback loop includes a resistor divider 18 to generate a proportional voltage V from the output voltage VOUT FB , and amplifier 20 amplifies the proportional voltage V FB with reference voltage V REF The difference between them produces an output correlation feedback signal opo. The buffer 22 generates the driving signal gd according to the feedback signal opo. In this embodiment, the buffer 22 includes a current source 24 and a PMOS 26 connected in series between the power supply VIN and the ground terminal GND. The gate of the PMOS 26 is connected to the feedback signal opo, and the source provides the driving signal gd. The clock generat...

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PUM

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Abstract

The invention provides a charge pump regulator and a method for generating a regulated voltage. The charge pump regulator is used for regulating the voltage on an output end and comprises: an input end used for connecting with a power source; a feedback loop used for generating an output interdependent feedback signal; a charge pump connected between the input end and the output end, in which a charge path and a discharge path can be interactively operated and established, wherein, the charge pump contains at least one flow control component used for controlling passing current according to the driving signal derived form the output interdependent feedback signal on the charge path or the discharge path; and a connector used for establishing or cutting off the path from the driving signal to the flow control component. The charge pump regulator and the method for generating the regulated voltage can reduce input ripple and output ripple without increasing the series resistance of the paths, thereby improving the efficiency; moreover, the area of the chips required by a whole circuit is relativelysmall. Relatively low open-loop resistance also increases current capability.

Description

technical field [0001] The present invention relates to a charge pump regulator, and more particularly to a high current charge pump regulator and a method of generating a regulated voltage. Background technique [0002] A Pulse Frequency Modulation (PFM) charge pump regulator, as described in U.S. Patent No. 6,411,531, includes a switched-capacitor network as a charge pump controlled by an output-dependent feedback signal The switching frequency of the switches connects the capacitor to the power supply or output, thereby charging and discharging the capacitor to generate a regulated voltage at the output. This circuit induces large changes in the input current, causing variations in the supply voltage and generating unwanted low-frequency noise. Low frequency noise is not easy to deal with and requires very large and expensive filters to remove. [0003] US Patent No. 6,411,531 also describes another charge pump regulator. The switch in the charge pump is switched at a f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/07
Inventor 林水木黄宗伟陈健生
Owner RICHTEK TECH