On chip voltage down converter for LV/LP digital system

A new on-chip differential amplifier based DC to DC Voltage Down Converter (VDC) is proposed. The converter is a negative feedback-type voltage follower with precise internal reference voltage generator and high current drive capability. This VDC converts 5 V to a lower voltage that the internal circuits of the chip use. Here, 3 V is used as a test vehicle. The proposed VDC has characteristics such as output voltage remains 3 V over a large load current range (0-100 mA) and temperature dependency of 29 mV//spl deg/C. The VDC chip was fabricated in a 0.8 /spl mu/m Single-Poly-Double-Metal CMOS process and layout size is 690/spl times/210 /spl mu/m/sup 2/. The output voltage is stabilized within /spl plusmn/1% for supply voltage with /spl plusmn/10% variation.