20A 5V single chip DC-DC converter IC with 5mohm MOSFET switch

摘要

In this paper, we demonstrate 20A 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=10A, gate voltage=5V) comparable to the discrete device. The fabricated chip achieves maximum output current 24A and max efficiency 91.2% for the input voltage, the output voltage and switching frequency of 5V, 1.083V and 980KHz, respectively. The efficiency without power loss by the parasitic resistance on PCB and output filter is 81.9% at the output current 20A.