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Method and circuitry for compensating low dropout regulators

A low-dropout linear and voltage regulator technology, applied in the direction of control/regulation systems, instruments, and adjustment of electrical variables, can solve problems such as small circuits

Active Publication Date: 2019-10-22
TEXAS INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With so many LDOs per circuit and circuits getting smaller, it is not practical to use an external load capacitor per LDO due to the size and cost of the external capacitors

Method used

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  • Method and circuitry for compensating low dropout regulators
  • Method and circuitry for compensating low dropout regulators
  • Method and circuitry for compensating low dropout regulators

Examples

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Embodiment Construction

[0010] In the drawings, the same reference numerals indicate similar or equivalent elements. The illustrative ordering of acts or events is not limiting, as some acts or events may occur in different orders and / or concurrently with other acts or events. Furthermore, some illustrated acts or events may be optional to implement methods in accordance with example embodiments.

[0011] As circuits become more integrated, these circuits have many different devices, components and subcircuits that often operate independently of each other, or at least in part independently of each other. As used herein, the term circuit may include a collection of active and / or passive components that perform circuit functions, such as analog circuits or control circuits. The term circuit may also include integrated circuits in which all circuit elements are fabricated on a common substrate. These different systems often require their own power supplies or power domains, and many systems require m...

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PUM

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Abstract

In described examples, a low dropout regulator (LDO) (300) includes an error amplifier (304) having a first input and a second input. The first input is for coupling to an output of the LDO (300), andthe second input is for coupling to a reference voltage (VREF). The error amplifier (304) has an output with a voltage that is proportional to the difference between the output voltage and the reference voltage (VREF). A second amplifier (310) is coupled between the error amplifier (304) and the output of the LDO (300). A gain boost amplifier (314) is coupled between the error amplifier (304) andthe second amplifier (310). The gain boost amplifier (314) increases DC gain of the LDO (300) in response to a load step on the output.

Description

Background technique [0001] Power management is an issue for circuits with multiple power supplies, especially when the circuits and power supplies are on a single chip, such as system-on-chip (SoC) circuits. Some of these circuits are powered by one or more DC-DC converters followed by a number of low-dropout linear regulators (LDOs), where each LDO is associated with a power domain. Sometimes a single SoC circuit has multiple power domains. These power domains can include digital signal processing cores, several sets of memory circuits, analog units, Bluetooth radios and audio units. [0002] A load step on the LDO occurs when the load powered by the LDO changes. Maintaining the accuracy of the voltage output by the LDO during a load step condition from no load to full load is important for proper operation of the power domain. One way to maintain accuracy during load steps is by including external load capacitors coupled to each LDO. With so many LDOs per circuit and ci...

Claims

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Application Information

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IPC IPC(8): G05F1/40
CPCG05F1/40G05F1/575G05F1/563
Inventor V·V·伊娃诺夫S·斯里拉杰
Owner TEXAS INSTR INC
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