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High Density Low Profile Coupled Inductor Design for Integrated Point-of-Load Converter
Fig. 1. Vertical flux coupled inductor structure.
Based on low temperature co-fired ceramics (LTCC) technology, low profile coupled inductor structure with lateral flux patterns is proposed to reduce inductor size. Comparing with vertical flux coupled inductor structure the lateral flux coupled inductor structure can have higher inductance density. The power density of a 1.5MHz, 5V to 1.2V, 3D integrated buck converter with LTCC lateral flux coupled inductor substrate is as high as 700W/in3.
Fig. 2. Lateral flux coupled inductor structure.
Fig. 3. LTCC coupled inductor with vertical flux.
Fig. 4. LTCC coupled inductor with lateral flux.
Fig. 5. Inductance of LTCC coupled inductor.
Fig. 6. Integrated POL with LTCC coupled inductor
