Integrated interleaving SC power converters with analog and digital control schemes for energy-efficient microsystems

Abstract

This paper addresses design strategies and tradeoffs of a series of newly developed interleaving switched-capacitor power converters. In such a design, a converter consists of multiple sub-cells in the power stage, and is regulated with interleaving power flow control. By splitting the power flow in a time-sequenced manner, the converter maintains a continuous power delivery flow to the output V OUT , with significant reductions on the in-rush input current and the output voltage ripples. System modeling and optimization focusing on power efficiency and z-domain closed-loop gain enhancement are discussed. An experimental prototype was successfully fabricated with a standard 0.35-lm digital CMOS N-well process. The entire die area, including fully integrated pads and power devices, is 3.84 mm 2 . Measurement results show that, with a supply voltage of 1.5 V and a load of 250 mA, the output of the converter is well regulated at 2.5 V with 16-mV ripple. The maximum efficiency of 82.3% is achieved at the output power of 625 mW.

Fabrication processes and experimental validation of a planar PV power system with monolithically embedded power converters

“…However, linear regulators suffer from an inferior efficiency profile, and these designs do not achieve dynamic voltage regulation. In order to overcome this limited efficiency barrier, switched-capacitor (SC) dc-dc converters have been proposed [7] [8]. The major limitation of many SC converters is the inability to produce the necessary variable conversion ratio (CR).…”

High efficiency, high switching speed, AlGaAs/GaAs P-HEMT DC–DC converter for integrated power amplifier modules

“…The envelope varying information is restored by modulating the supply voltage of the PA through the output of an envelope modulator. Possible supply modulators include linear low-dropout (LDO) [4][5][6], switched-capacitor converters [7][8][9], switched-mode dc-dc converters [10][11][12], and hybrid-solutions [13,14]. Among previously mentioned approaches, switch-mode DC-DC converters can provide the highest efficiency with acceptable bandwidth.…”