Design of a Step-down DC-DC Converter ASIC Applied to Portable Electronic Products

Kun Fang; Yao Sheng Lu; Fei Yu

doi:10.4028/www.scientific.net/AMM.311.255

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 311Design of a Step-down DC-DC Converter ASIC Applied...

Design of a Step-down DC-DC Converter ASIC Applied to Portable Electronic Products

Abstract:

Using CSMC 0.5μm process model, a Step-Down DC-DC converter ASIC applied to portable electronic products was designed. The peak current-mode control PWM with slope compensation was adopted in the power management chip to improve the dynamic response speed of the system; the error amplifier and PWM comparator was redesigned to improve the response speed and stability of the chip; the over-current protection function was included in the peak current sampling circuit; in addition, the circuit with the pulse-skipping mode reduce the battery energy loss. Capable of delivering 600mA Output Current over a wide input voltage range from 3.1 to 5.5V, the ASIC, that has a fixed operation frequency of 800kHz and 95% conversion efficiency, is ideally suited for portable electronic products. No external Schottky diode is required in practical application.

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Periodical:

Applied Mechanics and Materials (Volume 311)

Pages:

255-260

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.311.255

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Online since:

February 2013

Authors:

Kun Fang, Yao Sheng Lu, Fei Yu

Keywords:

ASIC, Peak Current-Mode, PWM, Step-Down DC-DC Converter

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