Demo Circuit 3092A features the LTC3312SA, 5V, dual 6A/dual-phase 12A step-down DC/DC regulator IC. This demo circuit is configured as a 2-phase, 2MHz, 3.3V input, single 1V output, 12A buck regulator. The top switches are 180-degree out of phase to reduce the output ripple.
The LTC3312SA features dual monolithic synchronous 6A step-down power stages in a 3mm × 4mm package for space saving applications with demanding performance requirements. Both bucks achieve high efficiency and fast transient response with low external component count. The LTC3312SA can also be configured as a dual output, 6A per output, step-down converter. Please refer to DC3091A as a dual output application example. The LTC3312SA data sheet gives a complete description of its operation and application information. The data sheet must be read in conjunction with the demo manual when evaluating or modifying this demo circuit.
DC3092A supports three operation modes, including pulse skip, forced continuous, and Burst Mode® operation. The clock frequency and the operation mode are shared by both buck phases. User can select desired operation mode with JP1 jumper. Setting JP1 to FC/SYNC position also allows the LTC3312SA to sync to a clock frequency from 1MHz to 3MHz, operating in forced continuous mode.
An EMI filter is included in this demo circuit for noise sensitive applications. To power with EMI filter, please apply input voltage via VIN EMI terminal.
