Output dynamic regulation circuit of low dropout linear regulator (LDO)

A low-dropout linear, dynamic adjustment technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve the problems of increasing power consumption, unable to completely eliminate delay, unable to eliminate voltage spikes, etc., to achieve small delay, Avoid voltage spikes, load lightening effects

Active Publication Date: 2013-09-25
BRITE SEMICON SHANGHAI CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of adjustment after the load changes is itself passive. It cannot completely eliminate the delay between the load change and the LDO output change, but only reduces the delay, so that the voltage spike caused by the delay cannot be eliminated.
Also, this requires additional analog circuitry, increasing power consumption

Method used

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  • Output dynamic regulation circuit of low dropout linear regulator (LDO)
  • Output dynamic regulation circuit of low dropout linear regulator (LDO)
  • Output dynamic regulation circuit of low dropout linear regulator (LDO)

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Embodiment Construction

[0037] The present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments.

[0038] The present invention provides an output dynamic adjustment circuit of a low-dropout linear regulator (hereinafter referred to as LDO), such as Figure 4 As shown, a load control circuit 401 , a dynamic output control circuit 402 , an LDO output circuit 403 and a load circuit 404 are provided. Among them, the load control circuit 401 outputs a first control signal to dynamically adjust the load circuit 404 according to the application requirements, and the change of the load circuit 404 causes the required current to change; therefore, the load control circuit 401 simultaneously outputs a signal according to the change of the load. Another second control signal is used to control the dynamic output control circuit 402 ; the dynamic output control circuit 402 then controls the LDO output circuit 403 to output the current required by the ...

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PUM

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Abstract

The invention relates to an output dynamic regulation circuit of a low dropout regulator (LDO). A digital circuit is combined with an analog circuit, a load control circuit generates control signals according to changing of load, and a dynamic output control circuit in the LDO can dynamically control assemblies designed proportionally and with different current output capabilities to output required current. The load control circuit can control changing of the load and LDO output current at the same time to achieve dynamic fast accurate matching of the load and required current. When the load changes, the circuit can adjust the magnitude of the output current so as to meet output requirements and eliminates impact on output voltage when the load changes suddenly. Meanwhile, the output dynamic regulation circuit adopts an interlaced wire distribution technology to place the dynamic output control circuit and an LDO output circuit at intervals, improves responding speed of the output circuit, reduces interference on the LDO circuit caused by power source noises and improves performance of the LDO circuit.

Description

technical field [0001] The invention belongs to the technical field of power supply management, and in particular relates to the structure and layout design of an output dynamic adjustment circuit of a low-dropout linear regulator LDO and a control circuit thereof. Background technique [0002] Low-dropout linear regulator 101 (hereinafter referred to as LDO) has the advantages of low cost, low output noise, simple circuit, and small chip area, and is widely used in SoC (system on chip) chips. to generate the power supply VDD2 supplied to the digital circuit 102, such as figure 1 shown. [0003] The essence of LDO is to use the stable voltage generated by the bandgap reference and the negative feedback control loop to obtain an output voltage that basically does not change with the environment. Existing typical LDO such as figure 2 As shown, it specifically includes: output tube MP1, error amplifier OA, and resistor feedback network. Its basic working principle is: the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
Inventor 戴颉职春星
Owner BRITE SEMICON SHANGHAI CORP
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