Supply independent low quiescent current undervoltage lockout circuit
First Claim
1. A circuit comprising:
- a comparator;
an IPTAT generator;
a first input of the comparator coupled to a first node of the IPTAT generator, the first node forms a bandgap voltage with respect to a reference node;
a second input of the comparator coupled to a second node of the IPTAT generator, the second node forms a bandgap voltage with respect to an input node.
1 Assignment
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Accused Products
Abstract
The UVLO (undervoltage lockout) circuit provides a very low quiescent current that is independent of supply voltage. The circuit includes a low voltage IPTAT (current proportional to absolute temperature) generator coupled to a comparator 24 wherein a first input of the comparator 24 is coupled to the IPTAT generator in a way that forms a bandgap voltage with respect to ground and a second input of the comparator 24 is coupled to the IPTAT generator in a way that forms a bandgap voltage with respect to a supply node. This makes the quiescent current independent of the supply voltage because there is no voltage divider between the supply node and ground.
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Citations
11 Claims
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1. A circuit comprising:
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a comparator;
an IPTAT generator;
a first input of the comparator coupled to a first node of the IPTAT generator, the first node forms a bandgap voltage with respect to a reference node;
a second input of the comparator coupled to a second node of the IPTAT generator, the second node forms a bandgap voltage with respect to an input node. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification