Synchronous Step-Down Switcher Keeps Quiescent Current Under 2.5 µA

Synchronous Step-Down Switcher Keeps Quiescent Current Under 2.5 µA

Thanks to its “Silent Switcher” architecture, the LT8614 4-A, 42-V, input-capable, synchronous step-down switching regulator reduces EMI/EMC emissions by more than 20 dB—well below the CISPR 25 Class 5 limit. Synchronous rectification delivers up to 96% efficiency despite switching frequencies in excess of 2 MHz. Burst-mode operation keeps quiescent current under 2.5 µA in no-load standby conditions, and output ripple below 10 mV p-p. Linear Technology’s switcher offers up to 4 A of continuous output current to voltages as low as 0.97 V. Input voltage ranges from 3.4 to 42 V, suiting it for automotive and industrial applications. With a minimum dropout voltage of 200 mV at 1 A under all conditions, the LT8614 fits well in scenarios such as automotive cold-crank. A 30-ns on-time enables 2-MHz constant frequency switching from a 16-V input to a 1.0-V output. The switcher comes in a 20-lead 3- by 4-mm QFN package.


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