Low dropout linear voltage regulator capable of increasing transient state response speed

A low-dropout linear and voltage regulator technology, which is applied in the direction of instruments, electric variable adjustment, control/regulation systems, etc., can solve problems such as slow transient response speed, and achieve the effect of improving transient response speed and reducing power consumption

Inactive Publication Date: 2018-07-03
BEIJING TONGFANG MICROELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional low dropout linear regulators have slow transient response due to the loop using only voltage feedback mode

Method used

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  • Low dropout linear voltage regulator capable of increasing transient state response speed
  • Low dropout linear voltage regulator capable of increasing transient state response speed
  • Low dropout linear voltage regulator capable of increasing transient state response speed

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Embodiment Construction

[0017] Such as figure 2 As shown, it is a circuit structure diagram of a low-dropout linear voltage regulator implemented in the present invention. The low dropout linear regulator circuit includes a transconductance amplifier Gm, a transimpedance amplifier Rm, a current sampling circuit, a switch, a feedback resistor and a frequency compensation network, wherein the current sampling circuit is composed of a conduction power tube Mp and a sampling current tube Mps, The conduction power tube Mp is connected to the gate of the sampling current tube Mps, the width-to-length ratio of the sampling current tube Mps and the conduction power tube Mp is 1:N (N can be taken as 1000), and the feedback resistance is composed of the feedback resistance R1 and the feedback resistance R2 is formed, and the switch is formed by switch K1 and switch K2.

[0018] The transconductance amplifier Gm is composed of two-stage amplifiers; PMOS transistor P1, PMOS transistor P2, NMOS transistor N1, N...

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Abstract

The invention discloses a low dropout linear voltage regulator capable of increasing transient state response speed. The low dropout linear voltage regulator comprises a transconductance amplifier, atrans-resistance amplifier, a current sampling circuit, a feedback resistance, a switch and a frequency compensation network. The low dropout linear voltage regulator disclosed by the invention adoptstwo working modes, namely double loop feedback control and single loop voltage feedback, when requirement on the transient state response speed is relatively high, the low dropout linear voltage regulator selects the current sampling circuit, the transconductance amplifier and the trans-resistance amplifier to be accessed into a feedback loop by virtue of switch control and selects the frequencycompensation network in the double loop feedback control mode for carrying out loop compensation, so that the transient state response speed of the low dropout linear voltage regulator is improved; and when the requirement on power consumption is relatively strict, the low dropout linear voltage regulator shuts off the current sampling circuit, shuts off the trans-resistance amplifier and is directly accessed into a loop by virtue of the transconductance amplifier, so as to form the single loop voltage feedback mode; and a single loop frequency compensation network is selected for carrying outthe frequency compensation, so that the power consumption of the low dropout linear voltage regulator is further reduced.

Description

technical field [0001] The invention relates to the technical field of integrated circuit power management chips, in particular to a low-dropout linear voltage regulator with improved transient response speed. Background technique [0002] In today's world, electronic products have become a necessity of people's life, and the power management system (Power Management Unit, PMU) plays an increasingly important role in consumer electronic products. The power management system is responsible for the detection of power distribution and other responsibilities. All kinds of mobile phones and tablet computers rely on a stable power supply to ensure their normal operation and improve their battery life. In the power management chip, the role of the low-dropout linear regulator (LDO) is crucial. The low-dropout linear regulator is an essential module in the power management system. Its function can provide the whole system with a stable and reliable power supply voltage that is not ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
CPCG05F1/562
Inventor 胡晓辉霍俊杰豆玉娇安建宏
Owner BEIJING TONGFANG MICROELECTRONICS
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