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Digital low dropout regulator

A regulator and low pressure drop technology, applied in the field of regulators, can solve the problems of LDO efficiency drop, LDO regulator loss, low LDO efficiency, etc.

Active Publication Date: 2009-12-23
MARVELL ASIA PTE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the voltage difference across the LDO increases, the efficiency of the LDO may become too low
For example, when generating a regulated 1.2 volt supply voltage from a 3.3 volt supply, the efficiency of the LDO drops to a very poor 36%
Unfortunately, today's digital integrated circuits operate on supply voltages of about 1.2 volts or less, and the minimum output voltage from a typical DC-DC converter is about 3.3 volts, which results in traditional LDO regulators Excessive loss in

Method used

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Embodiment Construction

[0061] FIG. 1 shows a block diagram of one embodiment of a coupled inductor regulator 10 for powering one or more devices, such as high speed drives and other electronic devices. The coupled inductor regulator 10 can perform open-loop operation to convert the input voltage V DD converted to a non-isolated output voltage V OUT . The amplitude of the output voltage is about an integer multiple or an integer factor of the input voltage, and can be determined by the structure of the coupled inductor regulator 10 and the number of coupled inductors in the coupled inductor regulator 10 . For example, in a buck configuration with two coupled inductors, coupled inductor regulator 10 can generate an output voltage that is approximately half the input voltage.

[0062] The coupled inductor regulator 10 may include a conduction switch 11, a freewheeling switch 12, and two or more coupled inductors 13 arranged in a buck, reverse or boost configuration. The driving signal generator 14 c...

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Abstract

The invention discloses a low-dropout (LDO) regulator, which is used to transform the input voltage of the input power supply into the output voltage of the output terminal. The LDO regulator includes a switch module that generates an output voltage. The switch module includes at least two parallel switches responsive to their respective switch control signals to regulate the flow of energy from the input source to the output. Each switch has an on state and an off state. The digital controller detects the output voltage and generates a switch control signal in response to the output voltage, thereby regulating the output voltage to a predetermined magnitude.

Description

technical field [0001] The present invention relates to power supply systems for electronic circuits, and more particularly to regulators in power supply systems. Background technique [0002] Low dropout (LDO) voltage regulators are widely used to provide voltage regulation in electronic branch systems. LDO regulators are most effectively utilized when the voltage difference between the input supply voltage and the regulated output voltage is very small. The smaller the voltage difference, the higher the power efficiency of the LDO regulator. For example, a 2.5 volt LDO operating from a 3.3 volt supply is about 75% efficient. Although the efficiency of LDOs is relatively poor compared to traditional high-performance DC-DC converters, this can be compensated by the relatively low cost of LDOs. However, as the voltage difference across the LDO increases, the efficiency of the LDO may become too low. For example, when generating a regulated 1.2-volt supply voltage from a 3...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/10H02M3/155H02M3/00H02M3/157H02M3/158
CPCH02M3/1584H02M3/157H02M2001/0012H02M1/0012
Inventor S·苏塔迪加
Owner MARVELL ASIA PTE LTD