Electronic digital logic circuitry – Interface – Current driving
Reexamination Certificate
2006-09-12
2006-09-12
Barnie, Rexford (Department: 2819)
Electronic digital logic circuitry
Interface
Current driving
C326S082000, C326S083000, C326S086000, C326S087000, C326S089000, C326S092000, C327S159000
Reexamination Certificate
active
07106105
ABSTRACT:
A high voltage circuit driver includes high and low side driver cells to drive a high and a low side power MOSFET, a bootstrap circuit to energize the high side driver cell, a high voltage PMOS transistor (HVPMOS) between a voltage source and the bootstrap circuit, wherein the HVPMOS is embedded in an N-isolation layer and is integrated with the driver cells. A bootstrap control circuit, for controlling the HVPMOS, includes a high voltage level shift stage, which can also be embedded in an N-isolation layer. The circuit driver is operated by switching the high side drive signal from high to low, the low side drive signal from low to high with a first delay, and a bootstrap control signal from high to low with an additional second delay. Also, the bootstrap capacitor is first charged by switching on the HVPMOS, and then it energizes the high side driver cell.
REFERENCES:
patent: 4281905 (1981-08-01), Harvey et al.
patent: 5543740 (1996-08-01), Wong
patent: 6353345 (2002-03-01), Yushan et al.
patent: 6825700 (2004-11-01), Hano
Fairchild Semiconductor Corporation
Sidley Austin LLP
White Dylan
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