Low cost stability improvement for a linear voltage regulator
First Claim
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1. An apparatus for supplying operating power to subsystems in an information handling system, said power supply apparatus comprising:
- a linear regulator;
a low series equivalent resistance (ESR) output capacitor; and
a conductor having a desired resistance, wherein the conductor couples the low ESR output capacitor to an output of the linear regulator, and whereby the desired resistance of the conductor contributes to stable operation of the linear regulator.
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Abstract
An information handling system has a printed circuit board power supply using a linear regulator and a very low ESR output capacitor. At least one printed circuit board conductive land having a desired resistance and coupled between the output capacitor and linear regulator output terminal may be used to stabilize operation of the linear regulator.
15 Citations
21 Claims
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1. An apparatus for supplying operating power to subsystems in an information handling system, said power supply apparatus comprising:
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a linear regulator;
a low series equivalent resistance (ESR) output capacitor; and
a conductor having a desired resistance, wherein the conductor couples the low ESR output capacitor to an output of the linear regulator, and whereby the desired resistance of the conductor contributes to stable operation of the linear regulator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus for supplying operating power to subsystems in an information handling system, said power supply apparatus comprising:
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a linear regulator;
a low series equivalent resistance (ESR) output capacitor; and
a first conductor and a second conductor having a combined desired resistance, wherein the first conductor couples a first node of the low ESR output capacitor to an output of the linear regulator, the second conductor couples a second node of the low ESR output capacitor to a common of the linear regulator, and whereby the desired resistance of the first and second conductors contributes to stable operation of the linear regulator. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An apparatus for supplying operating power to subsystems in an information handling system, said power supply apparatus comprising:
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a linear regulator;
a low series equivalent resistance (ESR) output capacitor; and
a conductor having a desired resistance, wherein the conductor couples the low ESR output capacitor to a common of the linear regulator, and whereby the desired resistance of the conductor contributes to stable operation of the linear regulator.
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Specification