Multimode voltage regulator
First Claim
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1. A multimode voltage regulator comprising:
- a low current pass device and a high current pass device each adapted for connection between a power supply and a load;
an error amplifier having an output line and responsive to a difference between a reference voltage and a function of the voltage on the load to produce an error signal on the output line; and
a low power driver responsive in a low load power mode to said error signal on the output line for operating said low current pass device to provide low power to the load and a high power driver responsive in a high load power mode to said error signal on the output line for operating said high current pass device to provide high power to the load for maintaining efficiency over high and low load power signals.
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Abstract
A multimode voltage regulator includes a low current pass device and a high current pass device each adapted for connection between a power supply and a load; an error amplifier responsive to a difference between a reference voltage and a function of the voltage on the load to produce an error signal; and a low power driver responsive in a low load power mode to an error signal for operating the low current pass device to provide low power to the load and a high power driver responsive in a high load power mode to an error signal for operating the high current pass device to provide high power to the load for maintaining efficiency over high and low power load operation.
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Citations
15 Claims
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1. A multimode voltage regulator comprising:
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a low current pass device and a high current pass device each adapted for connection between a power supply and a load;
an error amplifier having an output line and responsive to a difference between a reference voltage and a function of the voltage on the load to produce an error signal on the output line; and
a low power driver responsive in a low load power mode to said error signal on the output line for operating said low current pass device to provide low power to the load and a high power driver responsive in a high load power mode to said error signal on the output line for operating said high current pass device to provide high power to the load for maintaining efficiency over high and low load power signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A multimode voltage regulator comprising:
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transistors configured as a low current pass device and a high current pass device each adapted for connection between a power supply and a load;
an error amplifier responsive to a difference between a reference voltage and a function of the voltage on the load to produce an error signal;
a smaller active area low power driver, responsive in a low load power mode to said error signal, for operating said low current pass device to provide low power to the load; and
a larger active area high power driver, responsive in a high load power mode to said error signal, for operating said high current pass device to provide high power to the load.
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15. A multimode voltage regulator comprising:
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a low current pass device and a high current pass device each adapted for connection between a power supply and a load;
an error amplifier including a current source, a differential pair, and a current mirror, said error amplifier responsive to a difference between a reference voltage and a function of the voltage on the load to produce an error signal;
a low power driver, responsive in a low load power mode to said error signal, for operating said low current pass device to provide low power to the load; and
a high power driver, responsive in a high load power mode to said error signal, for operating said high current pass device to provide high power to the load.
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Specification