Analog Devices blends Silent Switcher architecture with SSFM for low EMI

Three dual channel 4A, 8.5A and 2A synchronous step down Silent Switcher converters provide low EMI operation for automotive, communications and solid state drive power supplies. The LT8650S, LT8652S and LT8653S Silent Switcher converters released by Analog Devices are based on the proprietary Silent Switcher 2 architecture with spread spectrum frequency modulation (SSFM) and is claimed to ensure PCB layout robustness to achieve low EMI performance that “easily meets” CISPR25 emissions, says the company.

A differentiating feature of the LT8650S, LT8652S and LT8653S is the inclusion of stackable-friendly outputs for higher current applications.  Outputs can be paralleled to scale up or down the output current based on the need of the system, while optimising thermal performance. This also helps to minimise inventory and qualification time with a single device, adds Analog Devices. For example, the LT8652S provides 8.5A DC from each channel simultaneously or up to 12A on either channel. Synchronising two LT8652S chips can achieve a four-phase, 34A supply.

The converters’ frequency is adjustable and synchronisable between 300kHz to 3MHz.

The LT8650S is in full production now and available in a 4.0 x 6.0mm LQFN. The LT8652S and LT8653S are in full production now and both are available in a 4.0 x 7.0mm LQFN.

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