Integrated Hysteretic Controlled Regulating Buck Converter with Capacitively Coupled Bootstrapping

Konferenz: SMACD / PRIME 2021 - International Conference on SMACD and 16th Conference on PRIME
19.07.2021 - 22.07.2021 in online

Tagungsband: SMACD / PRIME 2021

Seiten: 4Sprache: EnglischTyp: PDF

Galea, Francarl; Casha, Owen; Grech, Ivan; Gatt, Edward; Micallef, Joseph (Department of Microelectronics and Nanoelectronics, University of Malta, Malta)

This paper presents the circuit design, layout implementation and simulations of an on-chip hysteretic regulating buck converter. All the high voltage transistors of the buck converter were implemented using 45 V NMOS thin gate oxide layer transistors and are operated by means of a capacitively coupled bootstrap circuit. The circuit was implemented using the XFAB CMOS 0:35 µm high voltage technology and all the circuit blocks were designed using analog electronic techniques, with the transistors operating in the sub-threshold region, in order to minimize power consumption. Simulations show that the control circuit of the hysteretic regulator consumes around 0:5 muW, and the proposed buck converter operates at a peak efficiency of 82 %. The input voltage range of the regulator is from 1:5 V to 45 V and has a power range from 10 muW to 200 mW. The output regulated voltage is tunable via a feedback resistor and can be varied from 0:6 V to 40 V, with a dropout voltage of 1V.