Circuits and methods for adjustable peak inductor current and hysteresis for burst mode in switching regulators
First Claim
1. A switching regulator that supplies output current at a regulated voltage to a load, said switching regulator being capable of operating in Burst Mode, said switching regulator comprising:
- an input terminal;
an output terminal coupled to said load;
a control circuit coupled to said input and output terminals, said control circuit regulating the current supplied to said load; and
an adjustment circuit coupled to said control circuit for enabling a user to set a burst threshold level and a hysteresis of said switching regulator when said switching regulator operates in Burst Mode.
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Accused Products
Abstract
Switching regulator circuits and methods are provided for regulating output voltage that include an adjustable minimum peak inductor current level and adjustable burst comparator hysteresis for Burst Mode operation in switching regulators. Control over minimum peak inductor current level and burst comparator hysteresis is achieved during Burst Mode operation by allowing external user control of the burst threshold level and the burst comparator hysteresis. A single user-accessible input pin, two user-accessible input pins, or three user-accessible input pins may be used to distinguish between forced continuous and Burst Mode operations, set a burst threshold level, and set a burst comparator hysteresis during Burst Mode operation. The present invention may be applied to buck, boost, buck-boost, or any other suitable regulator circuit configuration. The present invention also may be employed with synchronous and non-synchronous switching regulators.
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Citations
26 Claims
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1. A switching regulator that supplies output current at a regulated voltage to a load, said switching regulator being capable of operating in Burst Mode, said switching regulator comprising:
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an input terminal; an output terminal coupled to said load; a control circuit coupled to said input and output terminals, said control circuit regulating the current supplied to said load; and an adjustment circuit coupled to said control circuit for enabling a user to set a burst threshold level and a hysteresis of said switching regulator when said switching regulator operates in Burst Mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. In a switching regulator that provides output current to a load at a regulated voltage, a method for operating said switching regulator in Burst Mode, the method comprising:
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coupling an input terminal to a source of input voltage; coupling an output terminal to said load; providing an adjustable burst threshold level, said burst threshold level controlling a minimum peak inductor current level of said switching regulator; enabling a user to set an adjustable hysteresis when said switching regulator operates in Burst Mode; regulating the output current to said load; enabling sleep mode by tripping a burst comparator; and de-asserting sleep mode by untripping said burst comparator, said hysteresis controlling when said burst comparator untrips. - View Dependent Claims (19, 20, 21)
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22. A switching regulator that supplies output current at a regulated voltage to a load, said switching regulator being capable of operating in Burst Mode, said switching regulator comprising:
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an input terminal; an output terminal coupled to said load; a control circuit coupled to said input and output terminals, said control circuit regulating the output current; and an adjustment circuit coupled to said control circuit for enabling a user to set setting at least a hysteresis of said switching regulator when said switching regulator operates in Burst Mode. - View Dependent Claims (23, 24)
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25. A switching regulator that supplies output current at a regulated voltage to a load, said switching regulator being capable of operating in a first operational mode having at least a length of time dependent on load conditions in which active switching elements are made to remain OFF, said switching regulator comprising:
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an input terminal; an output terminal coupled to said load; a control circuit coupled to said input and output terminals, said control circuit regulating the current supplied to said load; and an adjustment circuit coupled to said control circuit for enabling a user to set a burst threshold level and a hysteresis of said switching regulator when said switching regulator operates in said first operational mode. - View Dependent Claims (26)
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Specification