200nA low quiescent current deep-standby mode in 28nm DC-DC buck converter for active implantable medical devices

Abstract

the proposed deep-standby mode (DSM) is used in 28nm power management unit (PMU) for long-term usage in active implantable medical devices (AIMD). The PMU can upgrade its normal mode with the proposed embedded auto-cancellation (EAC) technique in order to have high accuracy even if the battery is aging and the PVT variations occur. The test chip fabricated in 28nm CMOS process features low quiescent current of 200nA and output voltage accuracy of 98%. Seamless transition among the DSM and the accurate mode demonstrates both low quiescent current and high accuracy can be achieved in the proposed PMU. Keyword: deep-standby mode (DSM), power management unit (PMU), active implantable medical devices (AIMD), embedded auto-cancellation (EAC).

Step down DC/DC converter for micro-power medical applications

“…Traditionally these kind of converters have been limited to power consumption above 1mW in the best case. While there are thousands of integrated circuits and complete modules in the market implementing switched-inductor DC/DC converters, it is only very recently that a few commercial products [9,10] were introduced, and a few published circuits [3,[11][12][13] have been reported, implementing efficient micro-power DC/DC converters with switched inductors (efficiencies g&60-90 % are reported in the cited references). In [3] a micro-power inductive DC/DC converter is presented, that supplies voltage for the digital core of a medical system-on-chip with V DD ranging from 0.5 to 1.0 V that achieves its best efficiency close to 90 %.…”