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LDO (Low Dropout Regulator) current limiting circuit linearly changing along with input voltage

A current-limiting circuit and linear change technology, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve the problem of chip damage and achieve the effect of solving chip damage

Active Publication Date: 2022-02-08
无锡迈尔斯通集成电路有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention proposes an LDO current limiting circuit that varies linearly with the input voltage, which solves the problem in the prior art that the chip is easily damaged due to high-voltage input and output with heavy load or short circuit

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  • LDO (Low Dropout Regulator) current limiting circuit linearly changing along with input voltage
  • LDO (Low Dropout Regulator) current limiting circuit linearly changing along with input voltage
  • LDO (Low Dropout Regulator) current limiting circuit linearly changing along with input voltage

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Embodiment Construction

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0024] An LDO current limiting circuit that varies linearly with the input voltage, including the LDO current limiting circuit, the current limiting circuit includes a Vin terminal, an amplifier U1 and an amplifier U2, the amplifier U1 and the amplifier U2 are electrically connected, and the Vin terminal The MOS transistor M0 and the MOS transistor M1 are electrically connected, and the MOS transistor M0 and the MOS transistor M1 are both electrically connected to t...

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Abstract

The invention provides an LDO current limiting circuit linearly changing along with input voltage, the LDO current limiting circuit comprises an LDO current limiting circuit, the current limiting circuit comprises a Vin end, an amplifier U1 and an amplifier U2, the amplifier U1 is electrically connected with the amplifier U2, the Vin end is connected with an MOS tube M0 and an MOS tube M1 in parallel, the MOS tube M0 and the MOS tube M1 are both electrically connected with the amplifier U2, the amplifier U2 is provided with a Gate end, the MOS tube M1 is electrically connected with the amplifier U1, one end, connected with the amplifier U1, of the MOS tube M1 is connected with a resistor Rs in parallel, the MOS tube M0 is electrically connected with a resistor R1 and a resistor R2 in sequence, the resistor R2 is electrically connected with the resistor Rs and is grounded, and the amplifier U1 is internally provided with an adjusting module used for reducing an input voltage rising current limiting value. Thus, the current limiting circuit is characterized in that the limiting current value is reduced with increase of input voltage, and has the advantages that the problem of chip damage caused by heavy load or short circuit when high voltage is input can be solved.

Description

technical field [0001] The invention belongs to the technical field of LDO circuits, in particular to an LDO current limiting circuit which varies linearly with input voltage. Background technique [0002] At present, the demand for LDO is becoming more and more widely used, and the amount is particularly large, presenting many problems. figure 1 It is a standard current limiting circuit in LDO, where the ratio of M1:M0 is 1:N, Vs=VIREF=Is*Rs=Iout / N*RsIout=VIREF / Rs*N, figure 2 It is a linear graph in which the current limit value has nothing to do with the input voltage. When the LDO input voltage is high, the output is overloaded or directly short-circuited, and the chip is easily damaged due to untimely protection. [0003] To solve this problem, many LDOs reduce the current limit value when the input voltage reaches a certain voltage, which can improve the problem that the chip is easily damaged due to heavy load or short circuit at the input high voltage output. The di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/573
CPCG05F1/5735Y02B70/10
Inventor 陈俊张明超
Owner 无锡迈尔斯通集成电路有限公司
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