Apparatus and method for charge pump control with adjustable...

Details Apparatus and method for charge pump control with adjustable... Apparatus and method for charge pump control with adjustable...

2008-07-08

2008-07-08

Laxton, Gary L (Department: 2838)

Electric power conversion systems

Current conversion

With voltage multiplication means

C323S271000, C327S536000

Reexamination Certificate

active

07397677

ABSTRACT:
A charge pump is provided. The charge pump may include an oscillator, a first switch, a second switch, a capacitor/switch network, an error amplifier, an adjustable resistance circuit, a first switch driver, and a second switch driver. In one embodiment, the first and second drivers each receive the oscillator voltage, and drive the first and second switches, respectively. Further, the adjustable resistance circuit is connected in series with the first and second switch circuits. The charge pump is arranged in a closed loop with the error amplifier driving the adjustable resistance circuit. The resistance of the adjustable resistance circuit is modulated to regulate the output voltage.

REFERENCES:
patent: 6411531 (2002-06-01), Nork et al.
patent: 6664829 (2003-12-01), Hughes
patent: 6717458 (2004-04-01), Potanin
Park, S. et al., “A Self-Boost Charge Pump Topology for a Gate Drive High-Side Power Supply,” IEEE, pp. 126-131 (2003).
Rao, A. et al., “Buck-Boost Switched-Capacitor DC-DC Voltage Regulator Using Delta-Sigma Control Loop,” IEEE, 4:743-746 (2002).
Starzyk, J. et al., “A DC-DC Charge Pump Design Based on Voltage Doublers,” IEEE, 48(3):350-359 (2001).
“Triple-Output TFT-LCD DC-DC Converters,” Maxim Integrated Products, pp. 1-16 (2004).

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