BYE-BYE TO EMI
LT8614 radiated EMI performance
The LT8614 radiated EMI performance lets it pass the most stringent CISPR25 Class 5 limits.
The LT8614 Silent Switcher technology has been tested against a current state-of-the-art switching regulator, the LT8610. Testing took place in a GTEM cell using the same load, input voltage, and the same inductor on the standard demo boards for both parts. We found that using the LT8614 Silent Switcher technology brings a 20-dB improvement compared to the already good EMI performance of the LT8610, especially at more-difficult-to-manage higher frequencies. Switching supplies based on the LT8614 need less filtering compared to other sensitive systems. Furthermore, the LT8614 exhibits benign time-domain behavior on its switch node edges. The LT8614 exhibits impressive performance, but it is not the end of the road. The LT8640 step-down regulator also features Silent Switcher architecture and delivers high efficiency at frequencies up to 3 MHz. Assembled in a 3×4mm QFN, the monolithic construction with integrated power switches and inclusion of all necessary circuitry yields a minimal PCB footprint. Transient response remains excellent and output voltage ripple is below 10 mVP-P at any load, from zero to full current. The LT8640 allows high-VIN-to-low-VOUT conversion at high frequency with a fast-minimum top switch on-time of 30 nsec.
Integration marches on
eeworldonline.com | designworldonline.com
ADI — Power Electronics HB 02-19.indd 13
2 • 2019
The LT8640 and the more integrated LT8640S. The part number of the new higher integrated version carries an “S” suffix.
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2/19/19 3:27 PM