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LDO (linear voltage regulator) for internal electric source and with improved load transient performance

A technology of voltage regulator and feedback regulation, which is applied in the direction of regulating electrical variables, control/regulation systems, instruments, etc., and can solve problems such as poor transient response characteristics

Active Publication Date: 2015-07-08
STMICROELECTRONICS (SHENZHEN) R&D CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, voltage regulator circuits with low quiescent current characteristics tend to have poor transient response characteristics

Method used

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  • LDO (linear voltage regulator) for internal electric source and with improved load transient performance
  • LDO (linear voltage regulator) for internal electric source and with improved load transient performance
  • LDO (linear voltage regulator) for internal electric source and with improved load transient performance

Examples

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Embodiment Construction

[0017] now refer to figure 1 , which illustrates a circuit diagram of an embodiment of a low dropout (LDO) voltage regulator circuit 100 . Circuit 100 includes differential amplifier 102 . Differential amplifier 102 includes a positive input terminal 104 configured to receive a reference voltage (VBG), which in a preferred embodiment is generated by a bandgap reference voltage generator (not shown, but whose configuration and operation are well within the skill of the art) personnel are well-known) to generate. The differential amplifier 102 further includes a negative input terminal 106 configured to receive a feedback voltage (VFB) generated in a form that will be described herein. The differential amplifier 102 is powered from positive and negative voltage supply nodes, this example including battery terminals (not shown) providing battery voltage (VBAT) and ground voltage. While a battery supply is shown, it will be understood that the voltage supplies coupled to the po...

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PUM

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Abstract

A voltage regulator includes a feedback regulation loop and a drive transistor configured to source current to a regulated output. A transient recovery circuit is coupled to the voltage regulator circuit and includes a first transistor coupled to source current into a control terminal of the drive transistor, wherein the source current is in addition to current sourced in response to operation of the feedback regulation loop. The first transistor is selectively actuated in response to a drop in voltage at the regulated output. The transient recovery circuit further includes a second transistor coupled to sink current from the regulated output. The sink current has a first non-zero magnitude in the quiescent operating mode of the regulator circuit. In response to an increase in voltage at the regulated output, the operation of the second transistor is modified to increase the sink current to a second, greater, non-zero magnitude.

Description

technical field [0001] The present invention relates generally to electronic circuits, and more particularly to voltage regulator circuits, such as low dropout voltage regulators. Background technique [0002] A voltage regulator circuit functions to take a varying input supply voltage and generate a regulated output voltage. For example, a varying input supply voltage may include a battery supply voltage, and a regulated output voltage is used to power analog and / or digital circuitry in battery powered circuit applications. The available operating voltage and current overhead required by the voltage regulator circuit are key design considerations. The usable operating voltage is often referred to as the "dropout" voltage, and this refers to the difference between the varying input supply voltage and the regulated output voltage provided by the voltage regulator circuit. The lower the "dropout" voltage, the better the system will operate. Furthermore, since the battery ca...

Claims

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Application Information

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IPC IPC(8): G05F1/56
CPCG05F1/575G05F1/59G05F1/565G05F1/56G05F3/30
Inventor 刘永锋
Owner STMICROELECTRONICS (SHENZHEN) R&D CO LTD
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