An energy management IC for bio-implants using ultracapacitors for energy storage
Author(s)Sanchez, William R.; Sodini, Charles G.; Dawson, Joel L.
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We present the first known energy management IC to allow low-power systems, such as biomedical implants, to optimally use ultracapacitors instead of batteries as their chief energy storage elements. The IC, fabricated in a 0.18 μm CMOS process, consists of a switched-capacitor DC-DC converter, a 4 nW bandgap voltage reference, a high-efficiency rectifier to allow wireless recharging of the capacitor bank, and a switch matrix and digital control circuitry to govern the stacking and unstacking of the ultracapacitors. The stacking procedure allows for more than 98% of the initial energy stored in the capacitors to be removed before the output voltage drops unsuitably low. The DC-DC converter achieves a peak efficiency of 51% for loads between 10 and 100 μW, operates for input voltages between 1.25 and 2.5 V.
DepartmentMassachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Microsystems Technology Laboratories
2010 Symposium on VLSI Circuits/Technical Digest of Technical Papers
Institute of Electrical and Electronics Engineers (IEEE)
Sanchez, William, Charles Sodini, and Joel L. Dawson. “An Energy Management IC for Bio-implants Using Ultracapacitors for Energy Storage.” 2010 Symposium on VLSI Circuits/Technical Digest of Technical Papers, 2010. 63–64. © 2010 IEEE
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