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Demonstration Circuit DC3123A features the LTC3315A dual 5V, 2A Synchronous Step-Down DC/DC regulators operating at 2MHz. One regulator provides a 1.2V output and the other provides 1.8V, both up to a 2A load. The LTC3315A supports adjustable output voltages from 0.5V to VIN, operating frequencies from 1MHz up to 3MHz. The LTC3315A is a compact, high efficiency, and high speed synchronous monolithic step-down switching regulator. Fast minimum on-time of 25ns enables high VIN to low VOUT conversion at high frequency.

The DC3123A operating mode may be selected as Burst Mode operation, Skip mode or Forced Continuous (FC) mode. Setting JP1 to the FC/SYNC position will allow the LTC3315A to sync to a clock frequency from 1MHz to 3MHz. The LTC3315A operates in Forced Continuous mode when syncing to an external clock.

The LTC3315A data sheet gives a complete description of the device, operation and application information. The data sheet must be read in conjunction with the demo manual. The LTC3315A is assembled in a 1.6mm × 1.6mm WLCSP package.

The Efficiency vs Load graph shows the efficiency and the power loss of the circuit with a 3.3V input in Burst Mode operation.

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