Title :
A low substrate loss, monolithically integrated power inductor for compact LED drivers
Author :
Xiangming Fang ; Mak, Tsz Him ; Yuan Gao ; Lau, Kei May ; Mok, Philip K. T. ; Sin, Johnny K. O.
Author_Institution :
Dept. of Electron. & Comput. Eng., Hong Kong Univ. of Sci. & Technol., Hong Kong, China
Abstract :
In this paper, a low substrate loss, monolithically integrated power inductor for compact LED drivers is designed and experimentally demonstrated. A 5.2 μH inductor is embedded at the backside of the silicon substrate, and the low-k, insulating material SU-8 is used to reduce the substrate loss. The inductor achieves a DC resistance of 2.3 Ω and a peak Q factor of 22 at 3.4 MHz. The inductor, controller, and LED array are flip-chip bonded on a silicon slab for discrete implementation of the monolithically integrated LED driver which achieves an overall power efficiency of 73%.
Keywords :
driver circuits; flip-chip devices; inductors; light emitting diodes; monolithic integrated circuits; compact LED driver; efficiency 73 percent; flip-chip devices; frequency 3.4 MHz; low substrate loss power inductor; monolithically integrated power inductor; resistance 2.3 ohm; Copper; Fabrication; Inductors; Light emitting diodes; Resistance; Silicon; Substrates; LED; integrated inductor; power converter;
Conference_Titel :
Power Semiconductor Devices & IC's (ISPSD), 2015 IEEE 27th International Symposium on
Conference_Location :
Hong Kong
Print_ISBN :
978-1-4799-6259-4
DOI :
10.1109/ISPSD.2015.7123387
