Self-heating trim techniques for improved LDO accuracy over load and temperature
First Claim
1. A method for compensating for a temperature effect during operation of a voltage regulator circuit, the method comprising:
- applying a load current at an output of the voltage regulator circuit;
measuring a first output voltage at the output;
measuring a reference current or voltage;
increasing the load current;
measuring a change in the reference current or voltage corresponding to the increased load current;
measuring a second output voltage when the measured change in the reference current or voltage exceeds a threshold;
determining a temperature coefficient trim code using a difference between the measured first output voltage and the measured second output voltage; and
modifying a resistance of a variable resistance based on the determined trim code to improve an output accuracy of the voltage regulator circuit over load current and temperature.
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Accused Products
Abstract
In one example, a method for compensating for a temperature effect during operation of a voltage regulator circuit includes applying a load current at an output of the voltage regulator circuit, measuring a first output voltage at the output, measuring a reference current or voltage, increasing the load current, measuring a change in the reference current or voltage corresponding to the increased load current, measuring a second output voltage when the measured change in the reference current exceeds a threshold, and determining a temperature coefficient (TC) value based on the measured second output voltage.
14 Citations
15 Claims
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1. A method for compensating for a temperature effect during operation of a voltage regulator circuit, the method comprising:
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applying a load current at an output of the voltage regulator circuit; measuring a first output voltage at the output; measuring a reference current or voltage; increasing the load current; measuring a change in the reference current or voltage corresponding to the increased load current; measuring a second output voltage when the measured change in the reference current or voltage exceeds a threshold; determining a temperature coefficient trim code using a difference between the measured first output voltage and the measured second output voltage; and modifying a resistance of a variable resistance based on the determined trim code to improve an output accuracy of the voltage regulator circuit over load current and temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for compensating for a temperature effect during operation of a low dropout regulator circuit, the method comprising:
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applying only one ambient temperature to the voltage regulator circuit; applying a load current at an output of the voltage regulator circuit; measuring a first output voltage at the output; measuring a reference current; increasing the load current; measuring a change in the reference current corresponding to the increased load current; measuring a second output voltage when the measured change in the reference current or voltage exceeds a threshold; determining a temperature coefficient trim code using a difference between the measured first output voltage and the measured second output voltage; and modifying a resistance of a variable resistor based on the determined trim code by burning or blowing at least one polysilicon fuse to improve an output accuracy of the low dropout regulator circuit over load current and temperature.
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Specification