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Low-dropout voltage regulator with a voltage slew rate efficient transient response boost circuit

A technology of voltage regulators and resistors, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve problems such as voltage drop and delay

Inactive Publication Date: 2009-04-29
ATMEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are significant voltage drops and delays in reaching the final regulated output voltage

Method used

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  • Low-dropout voltage regulator with a voltage slew rate efficient transient response boost circuit
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  • Low-dropout voltage regulator with a voltage slew rate efficient transient response boost circuit

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Embodiment Construction

[0027] The present invention is incorporated in a novel voltage regulator that provides a simple solution to improve voltage regulator performance while reducing output voltage drop. This solution includes a voltage slew rate efficient transient response boost circuit configured in accordance with the present invention. The present invention can also be applied to any known voltage regulator architecture by incorporating a voltage slew rate efficient transient response boost circuit that provides a simple solution to improve voltage regulator performance.

[0028] In one embodiment, quickly setting the gate node of the PMOS pass device to V gsmax voltage (or lower) to avoid voltage drops and reduce the delay between the output current step and the final regulated output voltage. When the output voltage drops below a predefined threshold, the gate node of the MOS pass device is coupled to V gsmax (or lower).

[0029] Referring now to FIG. 3, there is shown a schematic diagra...

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Abstract

A low-dropout (LDO) voltage regulator for generating an output voltage is disclosed. The voltage regulator includes a startup circuit, a curvature corrected bandgap circuit, an error amplifier, a metal oxide semiconductor (MOS) pass device and a voltage slew rate efficient transient response boost circuit. The MOS pass device has a gate node which is coupled to the output of the error amplifier, and a drain node for generating the output voltage. The voltage slew rate efficient transient response boost circuit applies a voltage to the gate node of the MOS pass device to accelerate the response time of the error amplifier in enabling the LDO voltage regulator to reach its final regulated output voltage when an output voltage drop occurs in the LDO voltage regulator.

Description

technical field [0001] The present invention relates to voltage regulating circuits. More particularly, the present invention relates to a voltage regulator that uses a semiconductor device to provide a substantially fixed output voltage over a varying load with a minimum voltage difference across the output. Background technique [0002] With the development of battery powered equipment, low dropout (LDO) voltage regulators have gained popularity. Portable electronic equipment, including cellular telephones, pagers, laptop computers, and various handheld electronic devices, has increased the need for efficient voltage regulation to extend battery life. LDO voltage regulators are typically packaged as integrated circuits (ICs) for providing a substantially stable output voltage over varying loads with minimal voltage difference across the output in battery powered devices. Furthermore, the performance of the LDO voltage regulator is optimized by considering the standby and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/40G05F1/56G05F1/618G05F1/565
CPCG05F1/575
Inventor 弗雷德里克·德莫利
Owner ATMEL CORP
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