Low-voltage linear adjuster

A voltage regulator, linear voltage technology used in LDOs. It can solve the problems of increasing the complexity of the chip, increasing the cost, increasing the chip area, etc., to achieve the effect of improving the transient response and voltage regulation ability, increasing the power consumption, and increasing the chip area.

Active Publication Date: 2007-11-21
ANYKA (GUANGZHOU) MICROELECTRONICS TECH CO LTD
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  • Application Information

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Problems solved by technology

However, the chip area is greatly increased, and at the same time, the comple

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[0053] The following describes the present invention in further detail based on the drawings and embodiments:

[0054] The invention realizes the improvement of the transient response and voltage regulation ability of the LDO while hardly increasing the chip area and power consumption. It can be seen from the analysis of the working principle of the LDO core circuit from the introduction of the technical background that the LDO essentially uses a feedback loop to control the gate-source-drain voltage of the power tube to achieve a stable output of the system voltage. Therefore, increasing the bandwidth can improve the transient response of the LDO, but the increase of the bandwidth will put forward higher requirements for the circuit design. Under the premise of determining the bandwidth, we proposed a scheme to improve the transient response and voltage regulation capability of the LDO by dynamically adjusting the gate-source voltage of the power tube. The core circuit of the pre...

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Abstract

A voltage regulator of low voltage linear type consists of an error amplifier with its reverse phase input end being connected to a reference voltage source, a p type of power tube with its grid being connected to output end of said amplifier and its drain electrode being used as output end of said voltage regulator, a dynamic control unit with its input end being connected to the same phase input end of said amplifier and its output end being connected to grid or drain electrode of power tube. Its regulating method is also disclosed.

Description

technical field [0001] The invention relates to a low dropout linear voltage regulator (LDO-Low dropout voltage regulator), in particular to an LDO suitable for an integrated circuit. Background technique [0002] LDO is widely used in the power supply of portable electronic devices (such as mobile phones, MP3, etc.), and its circuit structure is shown in Figure 1. ) and power tube (Series-pass Element). In the figure, Vb is the reference voltage provided by the bandgap reference. Its working principle is: if the load increases (the load resistance decreases), the output voltage Vout is lower than the required voltage, the feedback voltage Vref is also proportionally lower, the input voltage of the error amplifier decreases, and the output of the error amplifier The voltage Vampout decreases, so the current through the power tube M0 increases (the power tube can be a PMOS tube or a PNP pass element), so that Vout increases, Vref increases, the circuit restores balance, and...

Claims

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Application Information

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IPC IPC(8): G05F1/56
Inventor 索武生李小明刘志坚郑士源刘坚斌
Owner ANYKA (GUANGZHOU) MICROELECTRONICS TECH CO LTD
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