Title :
20A 5V single chip DC-DC converter IC with 5mohm MOSFET switch
Author :
Nakamura, Kazutoshi ; Naka, Toshiyuki ; Yasuhara, Norio ; Minohara, Daisuke ; Tsurugai, Takashi ; Nakagawa, Akio
Author_Institution :
Discrete Semicond. Div., Toshiba Corp. Semicond. Co., Kawasaki
Abstract :
In this paper, we demonstrate 20 A operation and high switching frequency 980 KHz of single chip DC/DC converter. The fabricated chip consists of the digitally control block, the low on-resistance MOSFET switches and the drivers. The chip adopted low impedance metal bump technology. The on resistance of Nch MOSFET is 4.3m (@drain current=10 A, gate voltage=5 V) comparable to the discrete device. The fabricated chip achieves maximum output current 24 A and max efficiency 91.2% for the input voltage, the output voltage and switching frequency of 5 V, 1.083 V and 980 KHz, respectively. The efficiency without power loss by the parasitic resistance on PCB and output filter is 81.9% at the output current 20 A.
Keywords :
DC-DC power convertors; driver circuits; field effect transistor switches; printed circuits; MOSFET switch; PCB; current 20 A; digitally control block; drivers; fabricated chip; frequency 980 kHz; low impedance metal bump; output filter; parasitic resistance; resistance 5 mohm; single chip DC-DC converter; voltage 5 V; DC-DC power converters; Digital control; Impedance; MOSFET circuits; Parasitic capacitance; Power MOSFET; Switches; Switching converters; Switching frequency; Voltage;
Conference_Titel :
Applied Power Electronics Conference and Exposition, 2009. APEC 2009. Twenty-Fourth Annual IEEE
Conference_Location :
Washington, DC
Print_ISBN :
978-1-4244-2811-3
Electronic_ISBN :
1048-2334
DOI :
10.1109/APEC.2009.4802704
