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LDO circuit for solving LDO power-on transition

A circuit, compensation circuit technology, applied in the direction of adjusting electrical variables, instruments, control/regulating systems, etc., can solve the problem of high output voltage

Pending Publication Date: 2022-04-29
南京元络芯科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Purpose: In order to overcome the problem in the prior art that the output voltage will follow the output voltage of the power supply VDD during the power-on process of the LDO and the output voltage is too high, the present invention provides an LDO circuit that solves the power-on transition of the LDO

Method used

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  • LDO circuit for solving LDO power-on transition
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  • LDO circuit for solving LDO power-on transition

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Embodiment 1

[0038] Such as Figure 7 As shown, it is an existing LDO circuit, wherein the compensation circuit includes a compensation resistor R1 and a compensation capacitor C1. Now, the current LDO circuit is simulated and compared with the LDO circuit of the third embodiment after power-on, as shown in Figure 8 As shown, the uppermost dotted line is the voltage transient curve of the power supply VDD, the middle dotted line is the load vout response curve of the existing LDO circuit as the power supply VDD voltage rises, and the bottom solid line is the LDO circuit of the third embodiment. According to the load vout response curve of the power supply VDD voltage rise, although the final load vout output voltage of the two LDO circuits is 2V, the existing LDO circuit structure will output a voltage far beyond the stable value as the power supply voltage rises, and In the third embodiment, the time required for the output to be stable is shorter, and the output voltage of the LDO circu...

Embodiment 2

[0040] Such as Figure 9 As shown, a specific structure of the third embodiment of the present invention, wherein the current control switch K1 adopts the pmos transistor Mp1, the switch K2 adopts the pmos transistor Mp2, the voltage limiting module D1 adopts the pmos transistor Mp3, and the time control system T1 adopts the resistor R4 and The series circuit of the capacitor C3, the resistor R4 is connected to the power supply VDD, the output terminal of the capacitor C3 is grounded, the common terminal of the resistor R4 and the capacitor C3 is connected to the G pole of the pmos tube Mp2, and the pmos tube Mp3 is connected in series to the drain of the pmos tube Mp2 by diode connection pole and the common end between the compensation circuit resistor R1 and capacitor C1.

[0041] opa is the operational amplifier, V_bias is the reference voltage, the voltage drop of the pmos tube Mp3 is close to a Vth, and its size is close to the Vgs voltage on the pmos tube Mp1, that is, t...

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Abstract

The invention discloses an LDO circuit for solving LDO power-on transition, which comprises a time control system T1, a switch K2 and a voltage limiting module D1, and is characterized in that a compensation circuit is connected in parallel between the output end of an operational amplifier opa and a load end vout; the input end of the time control system T1 is connected with the power supply VDD end, the output end of the time control system T1 is grounded, the input end of the switch K2 is connected with the power supply VDD end, the control end of the switch K2 is connected with the common end of the time control system T1, and the output end of the switch K2 is connected with the common end of the compensation circuit after passing through the voltage limiting module D1; the time control system T1 is used for controlling the switch K2 to be turned on and turned off in a delayed mode after the switch K2 is powered on. According to the LDO circuit for solving the problem of LDO power-on transition, the situation that the voltage value of the output end of the LDO exceeds the preset voltage value in the VDD power-on stage is avoided.

Description

technical field [0001] The invention relates to an LDO circuit for solving the power-on transition of the LDO, and belongs to the technical field of semiconductor integrated circuit manufacturing. Background technique [0002] With the development of science and technology, semiconductor devices are more and more widely used due to their own characteristics and advantages. An LDO is a linear regulator that uses a transistor or field effect transistor (FET) operating in its saturation region to subtract excess voltage from the applied input voltage to produce a regulated output voltage. [0003] LDO is widely used in analog integrated circuits, but during the power-on process, the operational amplifier has not yet entered a stable working state, resulting in the LDO not being able to control the output voltage. In some cases, the output voltage will directly follow the power supply voltage. If the voltage increases, the LDO may output more than the predetermined voltage duri...

Claims

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Application Information

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IPC IPC(8): G05F1/56
CPCG05F1/561
Inventor 张聪潘俊王静波李海涛徐健桂超
Owner 南京元络芯科技有限公司
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