Low-drop-out voltage regulator

A voltage regulator, low dropout technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., to reduce standby power consumption and reduce quiescent current.

Active Publication Date: 2015-07-01
WUXI ZGMICRO ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to ensure that its current consumption is still greater than 100nA in the worst case of +40% deviation, the current consumed by resistors R1 and R2 in typical cases should be designed to be 100nA (1+40%)=140nA, so that in the above example, The typical current consumption of resistors R1 and R2 can only be designed to be 140nA or greater

Method used

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Embodiment Construction

[0023] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] Reference herein to "one embodiment" or "an embodiment" refers to a particular feature, structure or characteristic that can be included in at least one implementation of the present invention. "In one embodiment" appearing in different places in this specification does not all refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments. Unless otherwise specified, the words connected, connected, and joined in this document mean that they are electrically connected directly or indirectly.

[0025] The low dropout voltage regulator in the present invention adds a second feedback loop between the power tube and the output terminal. When the leakage of the power ...

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Abstract

The invention provides a low-drop-out voltage regulator. The voltage regulator comprises a power tube, an error amplifier, an operational amplifier, a control transistor and an output end VO. The source of the power tube is connected with the power supply end, the drain is connected with the output end VO, the grid is connected with the output end of the error amplifier, the first input end of the error amplifier is connected with the drain of the power tube, and the second input end of the error amplifier is connected with a first reference voltage. The first input end of the operational amplifier is connected with the output end VO, the second input end is connected with a second reference voltage, the output end is connected with the control end of the control transistor, one connection end of the control transistor is connected with the drain of the power tube, and the other grounding end of the control transistor is connected with the grounding end. Compared with the prior art, a second feedback loop is added to adjust the output voltage and offset leakage power of the power tube, and accordingly, the static current of the low-drop-out voltage regulator can be reduced.

Description

【Technical field】 [0001] The invention relates to the technical field of circuit design, in particular to an ultra-low power consumption low-dropout voltage regulator. 【Background technique】 [0002] Please refer to figure 1 As shown, it is a schematic circuit diagram of a conventional low dropout voltage regulator. The low dropout voltage regulator includes an error amplifier EA, an output power PMOS transistor MP5, voltage dividing resistors R1 and R2, and an output capacitor C1. With the development of electronic technology, low power consumption is becoming more and more popular. For example, in Bluetooth 4.0 or Internet of Things systems, the standby power consumption of circuits is required to be lower and lower. The lower the standby power consumption, the longer the battery life , In recent years, the standby power consumption of low-dropout voltage regulators has developed towards a trend of less than 1 microampere. In order to further reduce the standby power co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
Inventor 王钊
Owner WUXI ZGMICRO ELECTRONICS CO LTD
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