High efficient 35 W, 12-to-5 V DC/DC converter using ceramic based multi-layer circuit technologies

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

“…Figure 1 shows the simplified block diagram of a non-isolated 35 W-class 12-to-5 V buck converter circuit [7]. 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.…”

“…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].…”

“…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]. The 35 W-class 12-to-5 V converter with a double-side structure where other components exist in the lower side of the power inductor has been reported [7]. This letter introduces improvements to ripple and noise characteristics using embedded metal layout strategies in the converter with the same in/out voltage and output power specifications as [7] and the evaluation results of EMI peak noise.…”