Low drop out voltage regulator

A low-dropout voltage regulator, voltage limiter technology, applied in instruments, regulating electrical variables, control/regulating systems, etc., can solve problems such as rise

Active Publication Date: 2011-03-23
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the start of life voltage of these batteries is as high as 4.2 volts, and some poorly regulated chargers can provide increased voltage when the user removes the battery and leaves the charger connected to the device to about 5.5 volts

Method used

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Embodiment Construction

[0010] Certain terms are used in the description and claims to refer to particular elements. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. The specification and claims do not use the difference in name as a way to distinguish components, but use the difference in function of components as a criterion for distinguishing. "Includes" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". In addition, the term "coupled" herein includes any direct and indirect means of electrical connection. Therefore, if it is described that the first device is coupled to the second device, it means that the first device may be directly electrically connected to the second device, or indirectly electrically connected to the second device through other devices or connection means.

[0011] figure 1 is a circuit diagram of a low dropout voltag...

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Abstract

A low drop out voltage regulator, comprising first and second field effect transistors arranged in series between a regulator input and a regulator output; a third field effect transistor co-operating with the first field effect transistor to form a first current mirror; a fourth field effect transistor co-operating with the second field effect transistor to form a second current mirror; first and second control transistors, which advantageously are bipolar transistors connected in series with the third and fourth field effect transistors respectively so as to control the current flowing therein; and a controller for providing a control signal to the first and second bipolar transistor as a function of a voltage at the regulator output.

Description

technical field [0001] The present invention relates to a low dropout voltage regulator. Background technique [0002] Portable electronic devices, such as mobile phones and ultra portable computing devices, are often powered by batteries. Currently, such devices are typically powered by 3.6 volt rechargeable batteries. However, the start of life voltage of these batteries is as high as 4.2 volts, and some poorly regulated chargers can provide increased voltage when the user removes the battery and leaves the charger connected to the device to approximately 5.5 volts. Therefore, a voltage stabilizer is usually arranged between the battery and these circuits. When the voltage stabilizer is working, it can ensure that the above circuits get a theoretically constant voltage. The above-mentioned circuits are usually digital circuits, which are usually fabricated using a sub-micron (sub-micron) complementary metal-oxide-semiconductor (Complementary Metal-Oxide-Semiconductor, C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56
CPCG05F1/46G05F1/56
Inventor 柏纳得·马克·坦博克克里斯多福·葛伦特·琼斯
Owner MEDIATEK INC
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