Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2005-03-29
2005-03-29
Riley, Shawn (Department: 2838)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
Reexamination Certificate
active
06873203
ABSTRACT:
An integrated circuit regulates current flowing from a battery to a load without requiring an external current sense resistor. The IC includes a primary charge pump; a model charge pump; a current sense circuit, a first control circuit to force a voltage level at the output of the model charge pump to be equal to a voltage level at the output of the primary charge pump; and, a second control circuit to force a model current put out by the model charge pump to be equal to a reference current. Current passing through the primary charge pump is regulated at a level established by the capacitance value of an external flying capacitor irrespective of input voltage variation of the battery power source.
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Maxim Integrated Products datasheet, MAX682, MAX683, MAX684, “3.3V-Input to Regulated 5V-Output Charge Pumps”, 19-0177; Rev. 1, Aug. 1998.
Fairchild Semiconductor datasheet, FAN5609, “LED Driver with Adaptive Charge Pump DC/DC Converter”, Rev. 1.0.2, May 30, 2003.
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Israel Schleicher, “LED Drive Delivers Constant Luminosity”, Electronic Design News, p. 88, Jun. 12, 2003.
Canfield John C.
Latham, II Paul W.
Riley Shawn
Tyco Electronics Corporation
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