A fully integrated ultra-low-power step-down DC-DC converter is demonstrated in 65nm. This circuit is useful for converting battery voltage levels (2.5 - 3V) to digital and mixed-signal voltage levels for low-power always-on domains. A down conversion of 5:1 is utilized to provide a near-Vth digital voltage of 0.55-0.6V, while making higher voltages (1.2V, 1.8V) available as well. An inverter-based amplifier is utilized to achieve high speed regulation at low power. Measured results show an Efficiency-Enhancement-Factor (EEF) of 66% and a power density of 2.56 mW/mm2 at an output power of 100W. At this power, these parameters represent the state-of-the-art. The DC-DC converter has a fast transient response which results in operation with minimal droops and overshoots even with output capacitors as low as 50 pF.
|Title of host publication||ESSCIRC 2021 - IEEE 47th European Solid State Circuits Conference, Proceedings|
|Publisher||Institute of Electrical and Electronics Engineers Inc.|
|Number of pages||4|
|State||Published - 13 Sep 2021|
|Event||47th IEEE European Solid State Circuits Conference, ESSCIRC 2021 - Virtual, Online, France|
Duration: 6 Sep 2021 → 9 Sep 2021
|Name||ESSCIRC 2021 - IEEE 47th European Solid State Circuits Conference, Proceedings|
|Conference||47th IEEE European Solid State Circuits Conference, ESSCIRC 2021|
|Period||6/09/21 → 9/09/21|
Bibliographical noteFunding Information:
This work was partly supported by the Croatian Science Foundation under project (IP-2016-06-1307).
© 2021 IEEE.
- dc-dc conversion
- voltage regulator