| US 7,541,794 B2 | ||
| Integrated FET synchronous multiphase buck converter with innovative oscillator | ||
| Fereydun Tabaian, Newport Coast, Calif. (US); Hamed Sadati, Dubai (United Arab Emirates); and Ali Hejazi, Dubai (United Arab Emirates) | ||
| Assigned to Nupower Semiconductor, Inc., Newport Beach, Calif. (US) | ||
| Filed on Jul. 07, 2008, as Appl. No. 12/168,460. | ||
| Application 12/168460 is a continuation of application No. 11/301192, filed on Dec. 12, 2005, granted, now 7,397,230. | ||
| Claims priority of provisional application 60/634858, filed on Dec. 10, 2004. | ||
| Claims priority of provisional application 60/634910, filed on Dec. 10, 2004. | ||
| Prior Publication US 2008/0265857 A1, Oct. 30, 2008 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. G05F 1/00 (2006.01); G05F 1/573 (2006.01) | ||
| U.S. Cl. 323—284 [323/274; 323/222] | 11 Claims |
| 1. An integrated buck convener for down converting a first voltage to a lower, second voltage, the buck converter comprising:
a periodic clock signal generator comprising a first input, a first output, a second output, and a third output;
a soft start circuit for enabling a smooth start and voltage sequencing, the soft start circuit comprising a first input coupled
to the first output of the periodic clock signal generator, and a first output;
an error amplifier for amplifying a first signal, the error amplifier comprising an inverting input, a non-inverting input,
and a first output;
a ramp generator for amplifying a second signal, the ramp generator comprising a first output; and
a pulse width modulator for holding a frequency constant while the width of a power pulse is varied, the pulse width modulator
comprising a first input coupled to the second output of the periodic clock signal generator, a second input coupled to the
first output of the soft start circuit, a third input coupled to the first output of the error amplifier, and a fourth input
coupled to the first output of the ramp generator,
wherein the periodic clock signal generator, the soft start circuit, the error amplifier, the ramp generator, and the pulse
width modular are electrically isolated from an external resistor divider.
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