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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, can solve the problems of increasing the series resistance at the input end, reducing the efficiency of the charge pump regulator, increasing energy consumption, etc., and reducing input ripple , Increase flexibility, reduce the effect of output ripple

Active Publication Date: 2008-10-15
RICHTEK TECH
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  • Abstract
  • Description
  • Claims
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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

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Embodiment Construction

[0068] 1 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 Between GND, and other control circuits used to operate the charge pump 10 . The feedback loop includes a resistive voltage divider 18 to generate a proportional voltage V from the output voltage VOUT FB , and the amplifier 20 amplifies the proportional voltage V FB with the reference voltage V REF The difference between the values ​​generates the output-dependent 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 c...

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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 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, and a feedback loop used for generating an output interdependent feedback signal, 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. 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 relatively small. 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 for generating a regulated voltage. Background technique [0002] A Pulse Frequency Modulation (PFM) charge pump regulator, as described in US Pat. No. 6,411,531, includes a switch-capacitor network as a charge pump with an output-dependent feedback signal The switching frequency of the switches is controlled so that the capacitor is connected to the power supply or the output terminal, thereby charging and discharging the capacitor to generate a regulated voltage at the output terminal. This circuit induces large changes in the input current, resulting in changes in the supply voltage and 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 char...

Claims

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Application Information

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