Circuit for preventing overshoot of output voltage of low dropout regulator

A technology with low dropout linearity and output voltage, which is applied in the direction of instruments, regulating electric variables, control/regulation systems, etc., and can solve the problems of large volume and low integrated circuit integration

Active Publication Date: 2020-10-20
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a circuit for preventing the output voltage overshoot of the low dropout linear regulator, which is used to solve the integration problem caused by the use of large capacitors in the prior art to prevent voltage overshoot. The technical problem of low circuit integration and excessive volume

Method used

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  • Circuit for preventing overshoot of output voltage of low dropout regulator
  • Circuit for preventing overshoot of output voltage of low dropout regulator
  • Circuit for preventing overshoot of output voltage of low dropout regulator

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Embodiment

[0035] figure 1Shown is a schematic circuit diagram of a traditional LDO according to an embodiment of the present invention, which includes an operational amplifier A, a power supply voltage VDD, a capacitor C1, a power transistor (Pass Device), voltage dividing resistors R1 and R2, an output capacitor Cout, and an equivalent series resistor (ESR). In the figure, the reference voltage Vref is used as the non-inverting input of the operational amplifier A, and the output terminal of the operational amplifier is connected to the grid of the power tube; the source of the power tube is connected to the power supply voltage, the drain of the power tube is grounded through the series resistors R1 and R2, and the drain voltage of the power tube is That is, the output voltage Vout of the LDO, Vout is reversely input to the operational amplifier through the resistor R1; the capacitor C1 is respectively connected to the gate and drain of the power tube; ESR and Cout are connected in se...

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Abstract

The invention provides a circuit for preventing overshoot of output voltage of a low dropout linear regulator (LDO), the LDO comprises a power tube, and the circuit comprises an overshoot prevention unit used for outputting slowly reduced control voltage; the circuit comprises a control unit, and the input end of the control unit is connected with the output end of the overshoot prevention unit. Moreover, the control voltage is fed back to the grid electrode of the power tube through the control unit, so that the output voltage of the low dropout regulator is slowly increased. The total volumeof the overshoot prevention unit and the control unit is far smaller than that of a capacitor connected to the output end of the LDO in parallel in the prior art, and therefore the design requirements for high integration degree and small size of an integrated circuit are met; moreover, active adjustment is carried out from the control end of the LDO, so that the output voltage overshoot of the LDO is effectively prevented, and the problems of component damage and the like possibly caused by the output voltage overshoot are avoided.

Description

technical field [0001] The invention relates to the technical field of semiconductor integrated circuits, in particular to a circuit for preventing output voltage overshoot of a low-dropout linear regulator. Background technique [0002] In recent years, the high demand for handheld and portable devices with long battery life has driven the research of low-voltage circuits. Among them, the design of low power consumption is particularly important for portable devices. The circuit and technology of the linear voltage regulator are relatively mature, and there are a large number of integrated linear voltage regulator module products, which make the linear regulated power supply circuit more concise, and are widely used in many medical, computer, industrial basic equipment and portable products. in the field. With the emergence of advanced CMOS processes (including 65nm, 40nm, and 28nm, etc.), low-power and small-area low-dropout linear regulators (Low Drop-outVoltage Regulat...

Claims

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Application Information

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IPC IPC(8): G05F1/56
CPCG05F1/56
Inventor 林少连邱雷韩志刚
Owner TONGJI UNIV
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