Low pressure difference voltage regulator with low load regulation rate

A voltage regulator, low dropout technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve the problems of poor load regulation rate, increase packaging cost, unsupported and other problems, and achieve higher output voltage and lower load regulation. rate effect

Inactive Publication Date: 2008-11-12
WUXI ZGMICRO ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For lower output voltages, if the resistance of the gold wire in the package remains the same, its voltage drop will cause more relative voltage drop and worse load regulation
Of course, gold wire packages with larger diameters can also be used, but this will increase the packaging cost, and some packages do not support gold wires with other diameters

Method used

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  • Low pressure difference voltage regulator with low load regulation rate
  • Low pressure difference voltage regulator with low load regulation rate
  • Low pressure difference voltage regulator with low load regulation rate

Examples

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Embodiment Construction

[0041] In the present invention a low dropout voltage regulator is proposed which has very low load regulation. In the low-dropout voltage regulator of the present invention, the output voltage of the output transistor MPass is increased to make up for the resistance caused by the packaged gold wire by drawing a replica current proportional to the load current from a specific node in the voltage divider circuit. The impact of the voltage drop, which in turn reduces the load regulation rate of the final output voltage of the low dropout voltage regulator.

[0042] figure 2 A first embodiment of the low dropout voltage regulator of the present invention is shown. The low dropout voltage regulator includes an output transistor MPass, a voltage divider circuit, a current replica circuit and an error amplifier circuit EA. The output transistor MPass receives the input voltage VCC and generates an output voltage Vo according to the control of the error amplifier. The voltage div...

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PUM

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Abstract

The invention discloses a low-dropout voltage regulator, including an error amplifier, an output tube and a feedback circuit; wherein, the output tube receives an input voltage and generates an output voltage under the control of the error amplifier; the feedback circuit provides a feedback voltage which can reflect the output voltage; the error amplifier controls the output tube according to the difference value between a reference voltage and the feedback voltage. The output voltage provides a voltage for loading by a wire resistance. The low-dropout voltage regulator further includes a current copy circuit which can generate a copy current which is in proportion to the current of the output tube, the copy current is led out from the feedback circuit to swig up the output voltage so as to make up the voltage drop of a load current on the wire resistance. Therefore, the load regulation rate of the low-dropout voltage regulator is lowered.

Description

technical field [0001] The invention relates to a voltage regulator, in particular to a low-dropout voltage regulator with a low load regulation rate. Background technique [0002] Low Dropout Voltage Regulators are widely used in power management circuits of various portable electronic devices. figure 1 A conventional low dropout voltage regulator (Low Dropout Regulator) is shown. The low dropout voltage regulator includes an output transistor Mpass, a voltage divider circuit and an error amplifier circuit EA. Wherein, the output transistor Mpass receives the input voltage VCC and generates the output voltage VO according to the control of the error amplifier. The voltage divider circuit consists of resistors R1 and R2 connected in series between the output voltage VO and ground, which provide a feedback voltage reflecting the output voltage VO to the error amplifier EA. The error amplifier EA generates an error amplification signal according to the difference between th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56G05F1/648
Inventor 王钊
Owner WUXI ZGMICRO ELECTRONICS CO LTD
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