A 200 nA Quiescent Current N-FinFET Power Stage Buck Converter with Passive Ramp On-Off-Time Control in 12 nm FinFET

This paper presents a 200 nA quiescent current, 4.8 MHz Fsw, all N-FINFET power stage buck converter with passive ramp (PSR) on-off-time control for a modern mobile silicon-on-chip (SoC). During DCM, only the main comparator is alive to maximize the light-load efficiency. An N-FinFET power stage with co-package designed debounce circuitry and bootstrap circuit performs a 35 mOhm R
dson
with all trace resistance. As a result, the efficiency > 90% range is from
$1\ \mu\mathrm{A}$
to 2 A. The proposed passive ramp constant-on-off time controller achieves a 23 mV/17 mV undershoot/overshoot voltage with 800 ns settling time with a
$1\ \mu\mathrm{A}$
to 500 mA loading step.