Apparatus and method for step-down switching voltage regulation

Details Apparatus and method for step-down switching voltage regulation Apparatus and method for step-down switching voltage regulation

2006-10-10

2006-10-10

Riley, Shawn (Department: 2838)

Electricity: power supply or regulation systems

In shunt with source or load

Using a three or more terminal semiconductive device

C323S283000, C323S288000

Reexamination Certificate

active

07119522

ABSTRACT:
A current mode PWM buck regulator is provided. The regulator includes a top-side transistor, a bottom-side transistor, an inductor, a sample-and-hold circuit, a ramp generator, a PWM comparator, an error amplifier, and a current sense amplifier. A current through the low-side transistor is sensed by the current sense amplifier. Also, a current sense voltage provided by the current sense amplifier is sampled when the low-side transistor is on, and held when the low-side transistor is off. The ramp generator is arranged to generate a voltage ramp that emulates the upslope of the inductor current. Additionally, the sampled low-side transistor current is combined with the voltage ramp. The PWM comparator is arranged to provide a PWM signal by comparing the voltage ramp to a comparison signal provided by the error amplifier.

REFERENCES:
patent: 6396252 (2002-05-01), Culpepper et al.
patent: 6930474 (2005-08-01), Wang
U.S. Appl. No. 10/985,477, Kenji Tomiyoshi.
Linear Technology Data Sheet (1999) “LTC 1707-High Efficiency Monolithic Synchronous Step-Down Switching Regulator,” pp. 1-16, Linear Technology Corporation, Milpitas, California.
Maxim Data Sheet (2001) “MAX1684/MAX1685-Low-Noise, 14V Input, 1A, PWM Step-Down Converters,” pp. 1-14, Maxim Integrated Products, Sunnyvale, California.

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