Electricity: electrical systems and devices – Safety and protection of systems and devices – Voltage regulator protective circuits
Patent
1998-04-07
1999-10-26
Sherry, Michael J.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Voltage regulator protective circuits
361 86, 363 59, H02H 700, H02M 318
Patent
active
059738952
ABSTRACT:
A circuit for disabling a two-phase charge pump includes a pump select circuit and a disable control circuit. The pump select circuit is configured to select one control signal from a plurality of control signals in response to at least one select signal. The selected signal is in effect provided to the disable control circuit, which also receives a pump disable signal. A voltage sensing circuit asserts the pump disable signal when the pumped voltage reaches a predetermined maximum level. While the pump disable signal is de-asserted, the disable control circuit in effect provides the selected signal to the two-phase charge pump as a pump control signal. However, when the pump disable signal is asserted, the disable control signal latches the current logic level of the pump control signal so that the pump control signal does not transition while the pump disable signal is asserted. As a result, the two-phase charge pump is prevented from performing an extra pump cycle that would cause the pumped voltage to exceed the predetermined maximum level.
REFERENCES:
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patent: 5483486 (1996-01-01), Javanifard et al.
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patent: 5587956 (1996-12-01), Tanida
patent: 5592370 (1997-01-01), Rogers
patent: 5808883 (1998-09-01), Hawkes
patent: 5841725 (1998-11-01), Kang et al.
Earl Jeffrey S.
Ternullo, Jr. Luigi
Sherry Michael J.
Vanguard International Semiconductor Corp.
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