Low dropout regulator with replica feedback frequency compensation
a low dropout, frequency compensation technology, applied in the direction of dc-dc conversion, power conversion systems, instruments, etc., can solve the problems of high power supply fluctuations, and disruption of biasing or preventing circuits from working,
Active Publication Date: 2017-08-24
AVAGO TECH INT SALES PTE LTD
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- Application Information
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Benefits of technology
This approach enables a stable and high-performance low dropout voltage regulator with reduced size and cost, maintaining stability and improving power supply noise rejection, especially at high frequencies, while allowing for the use of smaller capacitors that do not compromise performance.
Problems solved by technology
Due to spacing constraints of portable devices, circuits for multiple functions may require multiple voltage levels on the same chip.
High fluctuations in the power supply are not desirable because they may damage sensitive circuit components, disrupt biasing or prevent circuits from working.
These factors may be competing factors that make the design process of a high performance LDO a challenging one.
Method used
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[0028]A. Characteristics and Design Parameters of an LDO in a Regulator System
[0029]The low dropout regulator (LDO) is named for the small difference between its required supply voltage and the desired output voltage. A regulator that has a dropout voltage of one volt (V) or less may be considered a low dropout regulator. For example, an LDO may be used in an application that requires a 3.3 V output from a 3.6 V battery. In this example, the LDO must have a dropout voltage of 300 mV or less because the input voltage minus the voltage drop across the LDO equals the output voltage. Additionally, an LDO may be characterized as high power or low power. High power LDOs can yield currents that are equal to or greater than 1 ampere (A) to the output, thus these LDOs are also referred to as LDOs with a high current rating. In contrast, low power LDOs typically have a maximum output current of less than 1 A.
[0030]An LDO tends to have a high output impedance so it may be less stable than othe...
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Methods, systems, and apparatuses are described for a low dropout voltage regulator that utilizes a replica feedback frequency compensation technique to provide enhanced stability to the low dropout voltage regulator such that the low dropout voltage regulator does not need to be externally compensated with a large capacitor (e.g., larger than 4 microfarads). Rather, a small capacitor (e.g., 4 microfarads or smaller) may be used.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority to the following application, which is incorporated by reference herein in its entirety: U.S. Provisional Application No. 62 / 299,393, entitled “Low Dropout Regulator with Replica Feedback Frequency Compensation,” filed on Feb. 24, 2016.BACKGROUND[0002]Technical Field[0003]The subject matter described herein relates to voltage regulators, and in particular to low dropout regulators.[0004]Description of Related Art[0005]There is an increasing demand for electronic devices to be smaller, faster, and more efficient. To meet such a demand, higher performing power supply circuits, including voltage regulators, are needed. Due to spacing constraints of portable devices, circuits for multiple functions may require multiple voltage levels on the same chip. Therefore, voltage regulators are utilized to protect circuits from fluctuations in the power supply that may occur from crosstalk or digital switching. High flu...
Claims
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IPC IPC(8): G05F1/575G05F1/46
CPCG05F1/468G05F1/575G05F1/565G05F3/26H02M1/0045H02M1/007H02M3/1582H03F3/21H03G3/004
Inventor WONG, KIAN TIONG
Owner AVAGO TECH INT SALES PTE LTD