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Current sinking load circuit and low dropout linear regulator

A low-dropout linear, load circuit technology, applied in instruments, regulating electrical variables, control/regulating systems, etc., can solve the problem of large output voltage ripple of LDO, and achieve the effect of saving power consumption

Active Publication Date: 2017-12-22
OMNIVISION TECH (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

No matter which one needs to introduce a capacitor, if the capacitor is not used to stabilize the output voltage of the LDO, the ripple of the output voltage of the LDO will be very large

Method used

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  • Current sinking load circuit and low dropout linear regulator
  • Current sinking load circuit and low dropout linear regulator
  • Current sinking load circuit and low dropout linear regulator

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Embodiment Construction

[0035] The specific embodiments of the present invention will be described in more detail below with reference to the schematic diagrams. The advantages and features of the present invention will become apparent from the following description and claims. It should be noted that, the accompanying drawings are all in a very simplified form and in inaccurate scales, and are only used to facilitate and clearly assist the purpose of explaining the embodiments of the present invention.

[0036] The embodiment of the present invention provides a low dropout linear regulator (LDO), please refer to the appendix figure 2 , figure 2 A schematic structural diagram of the low dropout linear voltage regulator provided in the embodiment of the present invention is shown. The low dropout linear regulator includes a current sink load circuit, the current sink load circuit is connected in parallel with two ends of the load, one end of the load is connected to the output voltage of the low d...

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PUM

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Abstract

The invention provides a current sink load circuit and a low dropout linear regulator. The low dropout linear regulator comprises a bandgap reference circuit, an amplifier, a twelfth MOS transistor, a second resistor, a third resistor, a first capacitor and the current sink load circuit, the current sink load circuit is connected to the two ends of a load in parallel, one end of the load is connected to a drain electrode of the twelfth MOS transistor, and the other end of the load is grounded. When a low dropout linear filter is subjected to mode switching, the current sink load circuit is utilized for reducing the frequency of a total load current of the low dropout linear filter, and therefore the low dropout linear regulator can give a response in time; meanwhile, too much current cannot be wasted, and power consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of semiconductors, in particular to a current sink load circuit and a low-dropout linear regulator. Background technique [0002] Recently, more and more occasions need to use LDO (low dropout linear regulator) to supply power to the chip. Please see attached figure 1 , figure 1 A schematic structural diagram of a currently used LDO is shown. The conventional LDO includes: a bandgap reference circuit 101, an amplifier 102, a twelfth MOS transistor M12, a second resistor R2, a third resistor R3 and a first capacitor C1, wherein the bandgap reference The output terminal of the circuit 101 is connected to the inverting input terminal of the amplifier 102, the output terminal of the amplifier 102 is connected to the gate of the twelfth MOS transistor M12, and the source of the twelfth MOS transistor M12 is connected to At the second voltage VDD, the drain is connected to one end of the second resistor R2, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56
CPCG05F1/561
Inventor 惠雪梅吴卿乐杨黎
Owner OMNIVISION TECH (SHANGHAI) CO LTD