Efficiency improvement of a DC/DC converter using LTCC substrate

Abstract

We propose a substrate with high thermal conductivity, manufactured by the lowtemperature co-fired ceramic (LTCC) multilayer circuit process technology, as a

Noise mitigation in 12‐to‐5 V DC‐DC converter using an embedded metal layout strategy

“…The driver IC operating with pulse frequency modulation (PFM) mode switches to 500 kHz at a load of 35 W. At this condition, the L, C IN , and C OUT were determined to be 2.7 μH, 40 μF, and 95 μF, respectively by the equations of Ref. [5]. The analog ground and power ground, separated respectively, are connected through a bead.…”

“…To overcome the problems, several techniques such as layout strategies [1,2] and circuits with integrated a filter [3,4] have been proposed. In general, DC-DC converter is implemented by a flame retardant (FR-4)-based printed circuit board, whereas our research group has studied low-temperature co-fired ceramic (LTCC)-based DC-DC converter to achieve efficiency improvement and size reduction [5][6][7]. The first LTCCbased converter is the 120 W-class 48-to-12 V converter and it has a single-side structure where no other components exist on the lower side of the power inductor [5].…”

“…In general, DC-DC converter is implemented by a flame retardant (FR-4)-based printed circuit board, whereas our research group has studied low-temperature co-fired ceramic (LTCC)-based DC-DC converter to achieve efficiency improvement and size reduction [5][6][7]. The first LTCCbased converter is the 120 W-class 48-to-12 V converter and it has a single-side structure where no other components exist on the lower side of the power inductor [5]. The 40 W-class 5/12 V dual output converter with small size, high efficiency and high reliability has been reported, but it also has a single-side structure [6].…”

Towards an LTCC SiP for Control System in Safety-Critical Applications

“…Some in particular (e.g. [6][7][8][9][10][11][12][13]) implement the power stage with specific 3D power packages, but do not integrate mixed analog and digital circuits, as required for closed-loop readback mechanisms in this work.…”

“…In terms of thermal management and efficiency, LTCC is used for its superior thermal properties for power converters in conjunction with cavities to reduce interconnect parasitics and improve efficiency [9,10]. However, LTCC silver pastes have inferior electrical and thermal conductivity to copper and limited conductor thickness [16].…”