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Start-up overshoot suppression circuit for LDO

A technology for suppressing circuits and overshoots, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve the problems of increasing circuit area and circuit power consumption, unable to apply low power consumption and small area design requirements, etc. The effect of small circuit area

Active Publication Date: 2019-01-15
深圳芯智汇科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, additional proprietary circuits undoubtedly increase the circuit area and power consumption, which cannot meet the low power consumption and small area design requirements of most electronic products today.

Method used

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  • Start-up overshoot suppression circuit for LDO
  • Start-up overshoot suppression circuit for LDO
  • Start-up overshoot suppression circuit for LDO

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0020] The traditional low-dropout linear regulator (hereinafter referred to as "LDO") such as figure 1 As shown, it mainly includes the error amplifier EA and the power tube M1 serving as the final output in the amplifying circuit. Wherein, the source of the power transistor M1 is connected to two power resistors Rf1 and Rf2 connected in series, and the source is also grounded through a capacitor. Since the traditional LDO and its circuit connection structure belong to the prior art, details will not be repeated here.

[0021] In order to overcome the defects of large circuit power consumption and large occupied area of ​​the existing LDO startup overshoot suppression scheme, the invention proposes a startup overshoot suppression circuit with small circuit area and low power consumption. refer to figure 2 and Figure 4 The start-up oversho...

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Abstract

The invention discloses a start-up overshoot suppression circuit for the LDO. The start-up overshoot suppression circuit comprises a load current detecting unit, a current-voltage converting unit anda voltage comparing unit. The load current detecting unit is connected to the power tube of the LDO for real-time monitoring the amount of the current flowing from the LDO to the load. The current-voltage converting unit is connected in series to the load current detecting unit for converting the current collected by the load current detecting unit into a voltage. The input end of the voltage comparing unit is connected to the current-voltage converting unit, and the output end is connected to the output end of the error amplifier in the LDO, and the voltage comparing unit is used for pullingup the output of the error amplifier according to an output voltage of the current-voltage converting unit to limit the amount of current that the power tube outputs to the load. The start-up overshoot suppression circuit for the LDO realizes the suppression of the overshoot voltage at the start of the LDO with a simpler circuit design, a smaller circuit area and an ultra-low circuit power consumption, thereby realizing a smaller start-up overshoot.

Description

technical field [0001] The invention relates to the technical field of power management, in particular to a circuit for suppressing startup overshoot voltage of an LDO. Background technique [0002] With the increasing consumption of electronic products, portable electronic products such as smartphones, tablet computers, and notebook computers have become an indispensable part of people's daily life, and the strong growth of the above products has also made hybrid integrated circuits and SOC (System On chip (system-on-chip) develops rapidly, and often a chip needs multiple low-dropout linear regulators ("LDO" for short) to supply power to meet the low power consumption requirements of digital circuits. [0003] The life of the circuit working under the LDO voltage will be affected by the applied voltage. Excessive overshoot voltage during the startup of the LDO will seriously affect the life of the digital circuit, and may even cause breakdown of the device, so suppress the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/573
CPCG05F1/573
Inventor 张华磊
Owner 深圳芯智汇科技有限公司
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