Step-down converters feature ultra-low-EMI performance

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Analog Device has released three new synchronous step-down Silent Switcher converters that deliver low EMI operation for automotive, communications, and solid-state-drive power supply applications

By Gina Roos, editor-in-chief

Analog Devices Inc. (ADI) has expanded its Silent Switcher series with the introduction of the LT8650S, LT8652S, and LT8653S dual-channel 4A/8.5A/2A synchronous step-down converters targeted at automotive, communications and solid-state-drive power supply applications. The new Silent Switcher converters leverage ADI’s proprietary Silent Switcher 2 architecture along with spread spectrum frequency modulation to achieve ultra-low electromagnetic (EMI) performance that meets CISPR25 emissions.

The Silent Switcher 2 architecture integrates bypass capacitors to reduce radiated EMI and delivers ultra-low EMI on any printed circuit board. It also features optional spread spectrum modulation. (See video for more information on the technology’s low noise and high efficiency operation.)


A key differentiator for these products is their stackable-friendly outputs for higher current applications.  Outputs can be paralleled to scale up or down the output current based on system requirements while optimizing thermal performance, said ADI.

For example, the LT8652S provides 8.5 A DC from each channel simultaneously or up to 12 A on either channel. Synchronizing two LT8652S chips can achieve a 4-phase, 34-A supply.

“This also helps to minimize inventory and qualification time with a single device,” said ADI.

Other features include ultra-low quiescent current burst mode for light-load operation and an adjustable and synchronizable frequency from 300 kHz to 3 MHz.

Available now, the LT8650S (4 x 6 mm LQFN), LT8652S (4 x 6 mm LQFN), and LT8653S (4 x 3 mm LQFN) are priced, respectively, at $5.75, $4.50, and $4.02.