DC3252A

Demonstration circuit DC3252A features the LTC3303A, 5V, 4A synchronous step-down silent switcher operating as a 2MHz, 3.3V to 1.2V, 4A buck regulator. The LTC3303A supports adjustable output voltages from 0.5V to VIN. The LTC3303A is a compact, high efficiency, and high-speed synchronous monolithic step-down switching regulator. A minimum on-time of 27ns enables high VIN to low VOUT conversion. The DC3252A operating mode can be selected as Burst Mode operation, skip (PS) or forced continuous (FC) mode. Setting JP1 to the SKIP position allows the LTC3303A to sync to a clock frequency from 1.6MHz to 2.4MHz. The LTC3303A operates in forced continuous mode when syncing to an external clock. The DC3252A also has an EMI filter to reduce conducted EMI. This EMI filter can be included by applying the input voltage at the VIN EMI terminal. The EMI performance of the board is shown in the EMI Test Results section.

• Transient circuit included for load-transient evaluation
• EMI filter included to reduce noise in EMI emission tests
• LTC3303A is assembled in a 2x2mm FCQFN package with side wettable flank for visual solder inspection

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