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Starting overshoot suppression circuit used for LDO

A technology for suppressing circuits and overshooting, applied in electrical components, pulse technology, electronic switches, etc., can solve the design requirements that cannot be applied to low power consumption and small area, increase circuit area and circuit power consumption, etc., to avoid spikes Current flow to load, effect of small circuit area

Active Publication Date: 2019-03-08
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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  • Starting overshoot suppression circuit used for LDO
  • Starting overshoot suppression circuit used for LDO
  • Starting overshoot suppression circuit used for LDO

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Experimental program
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Embodiment Construction

[0016] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0017] 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.

[0018] In order to overcome the defects of the existing LDO startup overshoot suppression scheme, the present invention proposes a startup overshoot suppression circuit with small circuit area and low power consumption, such as figure 2 As shown, the start-up overshoot suppression circuit for the LDO proposed in the specific ...

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Abstract

The invention discloses a starting overshoot suppression circuit used for an LDO. The circuit comprises a first overshoot suppression circuit connected between a power end and an output end of an error amplifier of the LDO; the first overshoot suppression circuit comprises a first switch control unit and a voltage clamp unit which are in series connection, moreover, an enabling signal of the firstswitch control unit is obtained through inverting the enabling signal of the LDO and delaying for first predetermined time, thus, within the first predetermined time of starting of the LDO, through the voltage clamp unit, grid voltage of a power tube of the LDO is clamped to a first predetermined value, and grid source voltage of the power tube is maintained at a second predetermined value, so, current output to a load by the LDO is limited. With simpler circuit design, smaller circuit area and ultralow circuit power consumption, the starting overshoot suppression circuit provided by the invention realizes suppression of overshoot generated when the LDO starts, and thus, relatively small starting overshoot is realized.

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): H03K17/082
CPCH03K17/082Y02D10/00
Inventor 张华磊
Owner 深圳芯智汇科技有限公司
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