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http://dx.doi.org/10.5573/ieie.2016.53.10.040

Dual Mode Buck Converter Capable of Changing Modes  

Jo, Yong-min (인하대학교)
Lee, Tae-Heon (인하대학교)
Kim, Jong-Goo (인하대학교)
Yoon, Kwang Sub (인하대학교)
Publication Information
Journal of the Institute of Electronics and Information Engineers / v.53, no.10, 2016 , pp. 40-47 More about this Journal
Abstract
In this paper, a dual mode buck converter with an ability to change mode is proposed, which is suitable particularly for portable device. The problem of conventional mode control circuit is affected by load variation condition such as suddenly or slowly. To resolve this problem, the mode control was designed with slow clock method. Also, when change from the PFM(Pulse Frequency Modulation) mode to the PWM(Pulse Width Modulation) mode, to use the counter to detect a high load. And the user can select mode transition point in load range from 20mA to 90mA by 3 bit digital signal. The circuits are implemented by using BCDMOS 0.18um 2-polt 3-metal process. Measurement environment are input voltage 3.7V, output voltage 1.2V and load current range from 10uA to 500mA. And measurement result show that the peak efficiency is 86% and ripple voltage is less 32mV.
Keywords
portable device; dual mode buck converter; mode controller; slow clock;
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