  This paper describes a SIMO DC-DC converter capable of generating all the
required voltages (buck and boost) utilizing n-type transistors for the output
switches. The design incorporates only one shared bootstrap capacitor and a
single pad to connect the top plate of the off-chip bootstrap capacitor to the
on-chip drivers. By utilizing one off-chip bootstrap capacitor and sharing it
between the multiple outputs, this work presents a low cost and low area
solution for implementing a SIMO DC-DC converter using n-type transistor
switches. A prototype of the proposed SIMO DC-DC converter is fabricated in
180nm SILTERRA BCD Technology.
