Monolithic Power Systems, Inc. · NASDAQ:MPWR
Monolithic Power Systems — Technical Presentation (March 2021)
19 slides from Monolithic Power Systems's technical presentation, March 2021
Slide 1: No Compromise Needed: Cost-Effective, 2-Layer PCBs Deliver Impressive EMI and Thermal Performance
Starts at 11AM PDT 8PM CEST Europe 2AM China CST 3AM Japan JST No Compromise Needed: Cost-Effective, 2-Layer PCBs Deliver Impressive EMI and Thermal Performance March 2021 Ralf Ohmberger, Applications Engineer, MPS All attendees are muted. Live QA available via chat.
Slide 2: Agenda
Agenda Motivation 4-Layer PCB vs. 2-Layer PCB MPQ4323 – Compact, Low IQ, 36V/3A, Sync Buck MPQ4323 – Recommended Schematic MPQ4323 – Recommended Layout MPQ4323 – Recommended Placement MPQ4323 – Recommended DC/DC Layout MPQ4323 – Recommended Bottom Layer Layout MPQ4323 – Recommended Filter Layout MPQ
Slide 3: Motivation
Motivation Increasing cost pressure has led to the reintroduction of 2-layer PCB designs, which are a cost-effective alternative to 4-layer PCB ECUs. Strict EMC limits are difficult to meet in a 4-layer PCB, and are even more difficult to meet in a 2-layer PCB. Operating TAMBIENT requirements have r
Slide 4: 4-Layer PCB vs. 2-Layer PCB
4-Layer PCB vs. 2-Layer PCB 4-Layer 2-Layer SIGNAL SIGNAL 0.2mm GND 1.2mm 1.6mm SIGNAL The return path is 8 times GND GND longer in a 2-layer PCB. PCB Stack PCB Stack The IC case temperature TAMB = 25.8ºC TAMB = 25.9ºC is 12°C higher with 2- layer PCBs. ΔT = 20.4ºC ΔT = 32.1ºC PCB Thermal Image* PCB
Slide 5: MPQ4323 – Compact, Low IQ, 36V/3A, Sync Buck
MPQ4323 – Compact, Low IQ, 36V/3A, Sync Buck Features: • Wide 3.3V to 36V Operating Voltage Range • Supports 42V Load Dump, Cold Crank as Low as 3V • MPQ432x: Family of Pin-to-Pin Parts Covers 0.5A to 4A Applications • 20μA Input Current under No-Load Conditions • Up to 96% Peak Efficiency • 350kHz
Slide 6: Recommended Schematic
MPQ4323 – Recommended Schematic To further reduce costs, CIN, COUT, and L3 can be optimized. Use a small 1µH to 2.2µH inductor for 2.2MHz. The ferrite bead was not required to pass EMC, but it could be useful in more compact boards. 8
Slide 7: Recommended Layout
MPQ4323 – Recommended Layout 9
Slide 8: Recommended Placement
MPQ4323 – Recommended Placement BST Analog COUT L Input Filter CIN 10
Slide 9: Recommended DC/DC Layout
MPQ4323 – Recommended DC/DC Layout 1. Connect VIN to a wide copper polygon to improve heat dissipation. Use a symmetrical VIN input, and wrap it around the analog signals. 2. Keep the SW node small, with just 4 enough area to connect it to the 1 inductor while adding a test point. 2 3. Connect PGND
Slide 10: Recommended Bottom Layer Layout
MPQ4323 – Recommended Bottom Layer Layout When possible, avoid routing signals in the bottom layer. Route the FB trace on the bottom layer to avoid interrupting the VIN path. If the trace 1 4 gets too long, it may be a good idea to BST PG 2 alternate between bottom and top layers in a stitching patt
Slide 11: Recommended Filter Layout
MPQ4323 – Recommended Filter Layout 1. Place the small-value capacitors very close to the connector. This helps filter higher frequencies, and is key to passing EMC. 3 4 2. Use 2 capacitors in series (connected in a 90° orientation to one other) to avoid fire if one of the MLCCs cracks. 1 2 3. Place
Slide 12: Thermal Effect of Different Layouts
MPQ4323 – Thermal Effect of Different Layouts Traditional Recommended ∆ = 46.8°C, Max = 76.3°C, TA = 29.5°C ∆ = 40.7°C, Max = 67.8°C, TA = 27.1°C 3 - 6°C 1 2 MPQ4323, 430kHz, 13.5V to 5V, 3A, 4h runtime MPQ4323, 430kHz, 13.5V to 5V, 3A, 4h runtime A traditional layout has a cut in GND around The new
Slide 13: MPS's MPQ4323 vs. Competitors
MPS’s MPQ4323 vs. Competitors The MPQ4323 is >4°C cooler. The observed difference was consistent when tested using a variety of PCBs. MPQ4323 Competitor’s Part ∆ = 40.7°C ∆ = 45.0°C Max = 67.8°C Max = 74.6°C TA = 27.1°C TA = 29.6°C 4-hours runtime 4-hours runtime ∆=41.2°C MPQ4323: 430kHz, 13.5V to 4
Slide 14: EMC Results from Recommended Layout
CE 150kHz to 108MHz CE 150kHz to 108MHz 16 2.2MHz 430kHz 9dB 4dB RE 150kHz to 30MHz RE 150kHz to 30MHz 2.2MHz 430kHz EMC Results from Recommended Layout
Slide 15: EMC Results from Recommended Layout
RE H 30MHz to 200MHz RE H 30MHz to 200MHz 17 2.2MHz 430kHz RE V 30MHz to 200MHz RE V 30MHz to 200MHz 2.2MHz 430kHz EMC Results from Recommended Layout
Slide 16: EMC Results from Recommended Layout
RE H 200MHz to 1GHz RE H 200MHz to 1GHz 18 2.2MHz 430kHz RE V 200MHz to 1GHz RE V 200MHz to 1GHz 2.2MHz 430kHz EMC Results from Recommended Layout
Slide 17: Conclusion
Conclusion • The MPQ4323 allows cost-effective, 2-layer PCB designs to perform well in harsh environments. • The IC can achieve close to full output operation in ambient temperatures that are approximately 100°C when operating at 400kHz, and approximately 80°C when operating at 2.2MHz*. • The MPQ432
Slide 18: Q&A
Q&A Let us know your questions For Customer Use Only
Slide 19: Thank You – Q&A
Thank You – Q&A For more information, contact: [email protected] Check out our AEC-Q100 Power Management Solutions at MonolithicPower.com
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