The LTC3890 Demo Board DC2236A supports three operation modes: Fixed Frequency Modulation, Pulse-Skipping, and Burst Mode® operation. Fixed Frequency mode of operation maximizes the output current, reduces output voltage ripple, and yields a low noise switching spectrum. Burst Mode employs a variable frequency switching algorithm that minimizes the no-load input quiescent current and improves efficiency at light loads.
The DC2236A consumes less than 50µA of quiescent current during shutdown and less than 1mA under a no-load condition with the output in regulation in Burst Mode operation. The DC2236A has a standard operating frequency of 150kHz, but can be adjusted to frequencies as high as 900kHz. The DC2236A is a dual-phase single-output step-down converter. However, it is designed to be easily transformed to a 4- or 6- phase system by combining two or three DC2236A boards.
The ADI LTC3890 Demo Board DC2236A is offered in two variants. The DC2236A-A is supplied populated with the Pulse-Skipping Mode LTC3890EUH-2. The 2236A-B is supplied populated with the Forced Continuous Mode LTC3890EUH.