High-accuracy low-dropout voltage regulator

A voltage regulator, low dropout technology, applied in the direction of regulating electrical variables, control/regulating systems, instruments, etc., can solve problems such as deviation from target values

Active Publication Date: 2015-03-04
WUXI ZGMICRO ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The trimming is generally carried out in a certain environment (such as normal temperature, before packaging, and under a certain humidity), but because the error amplifier EA has an input offset voltage Vos (that is, there is a certain difference in the positive and negative terminal voltag...

Method used

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Embodiment Construction

[0015] 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.

[0016] 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.

[0017] figure 2 It is a schematic circuit diagram of the low dropout voltage regulator 200 in an embodiment of the present invention. Such as figure 2 As shown, the lo...

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Abstract

The invention provides a high-accuracy low-dropout voltage regulator which comprises an output tube, a voltage division circuit, a current source, an adjustable resistor string, an error amplifier and an imbalance calibration circuit. The current source and the adjustable resistor string are sequentially connected between input voltage and the ground. The adjustable resistor string comprises a plurality of trimming resistors sequentially connected in series and a plurality of trimming switches in parallel connection with the trimming resistors. The first input end of the error amplifier is connected with the current source and the middle node of the adjustable resistor string, the second input end of the error amplifier receives feedback voltage obtained by the voltage division circuit, and the output end of the error amplifier is connected with the control end of the output tube. The first input end of the imbalance calibration circuit receives reference voltage, the second input end of the imbalance calibration circuit receives the feedback voltage, and the output end of the imbalance calibration circuit is connected with the control ends of the trimming switches. The imbalance calibration circuit outputs calibration data to the control ends of the trimming switches so as to enable the feedback voltage to be locked in a reference voltage based locking range. Therefore, the influence brought by environmental temperature, environmental humidity and package situation can be made up.

Description

【Technical field】 [0001] The invention relates to the technical field of power conversion, in particular to a high-precision low-dropout voltage regulator. 【Background technique】 [0002] figure 1 An existing low dropout voltage regulator is shown, which includes a reference voltage generating circuit, an error amplifier EA, an output transistor MP1, a resistor R1, a resistor R2 and an output capacitor Co. The reference voltage generation circuit is a Bandgap reference voltage circuit, and the output voltage VO can be adjusted accurately by trimming the reference voltage generation circuit. The trimming is generally carried out in a certain environment (such as normal temperature, before packaging, and under a certain humidity), but because the error amplifier EA has an input offset voltage Vos (that is, there is a certain difference in the positive and negative terminal voltage), and the input offset voltage Changes will occur with temperature changes, humidity changes, b...

Claims

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Application Information

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IPC IPC(8): G05F1/56
Inventor 王钊
Owner WUXI ZGMICRO ELECTRONICS CO LTD
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