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Title: A wide-load-range single-inductor-dual-output boost regulator with minimized cross-regulation by constant-charge-auto-hopping (CCAH) control
Authors: Jing, Xiaocheng
Mok, Philip
Lee, Ming Chak
Keywords: CMOS integrated circuits
Power converters
Switching convertors
Voltage control
Issue Date: Sep-2009
Citation: Proceedings 2009 IEEE Custom Integrated Circuits Conference (CICC' 09), 13-16 September 2009, San Jose, CA, USA, p. 299-302.
Abstract: A novel single-inductor-dual-output (SIDO) boost regulator with constant-charge-auto-hopping (CCAH) control to minimize the cross interference between channels is presented. In order to have a predictable system switching noise spectrum, the switching frequency of the converter is automatically hopped between 1.25MHz and 1.25MHz/N where N = 2 to 5 according to the loads and during transient. A prototype has been fabricated with a 0.35μm CMOS process to verify the effectiveness of CCAH control. With 1.8V-2.4V input voltage, two regulated output voltages between 3.0V and 3.6V, each with maximum 250mA driving capability, are provided. Load transient measurements show that the cross-regulation is less than 0.1mV/mA with a 200mA change of load current.
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