Title :
A wide-load-range single-inductor-dual-output boost regulator with minimized cross-regulation by constant-charge-auto-hopping (CCAH) control
Author :
Jing, Xiaocheng ; Mok, Philip K T ; Lee, Ming Chak
Author_Institution :
Hong Kong Univ. of Sci. & Technol., Hong Kong, China
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 1.25 MHz and 1.25 MHz/N where N = 2 to 5 according to the loads and during transient. A prototype has been fabricated with a 0.35 mum CMOS process to verify the effectiveness of CCAH control. With 1.8 V-2.4 V input voltage, two regulated output voltages between 3.0 V and 3.6V, each with maximum 250 mA driving capability, are provided. Load transient measurements show that the cross-regulation is less than 0.1 mV/mA with a 200 mA change of load current.
Keywords :
CMOS integrated circuits; power convertors; switching convertors; voltage control; CCAH; CMOS process; constant-charge-auto-hopping control; cross interference minimization; current 250 mA; load transient measurement; single-inductor-dual-output boost regulator; size 0.35 mum; switching noise spectrum; voltage 3 V to 3.6 V; Automatic control; CMOS process; Current measurement; Interference; Prototypes; Regulators; Switching converters; Switching frequency; Voltage;
Conference_Titel :
Custom Integrated Circuits Conference, 2009. CICC '09. IEEE
Conference_Location :
San Jose, CA
Print_ISBN :
978-1-4244-4071-9
Electronic_ISBN :
978-1-4244-4073-3
DOI :
10.1109/CICC.2009.5280824
