Step-Down Switcher Delivers 94% Efficiency

Analog Devices’ LT8650S dual 4A, 42V input synchronous step-down switching regulator employs the company’s Silent Switcher2 architecture that uses four internal input capacitors as well as two internal BST and a single INTVCC capacitor to minimize the area of the hot loops. The device’s synchronous rectification delivers efficiency as high as 94.6% with a switching frequency of 2 MHz. Its 3V to 42V input voltage range is viable for automotive and industrial applications.


Combined with very well controlled switching edges and an internal construction using copper pillars in lieu of bond wires and an integral ground plane, the LT8650S’s design dramatically reduces EMI emissions. This improved EMI performance is not sensitive to PCB layout, simplifying design and reducing risk even when using two layer PC boards. The LT8650S can pass the automotive CISPR 25, Class 5 peak EMI limits with a 2MHz switching frequency over its entire load range. Spread spectrum frequency modulation is also available to lower EMI levels further.


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The LT8650SEV is packaged in a 4 mm x 6 mm LQFN. An industrial temperature version, the LT8650SIV, is tested and guaranteed to operate from a –40°C to +125°C operating junction temperature. Pricing starts at $5.75 each/1,000 and both versions are available from stock. For more details and specs, an LT8650SEV datasheet is available. For more info, contact Analog Devices Inc., Norwood, MA. 800-445-2564 or local 781-329-4700