Features and Benefits
Demonstration circuit 2777A is a dual step-down DC/DC switching converter featuring the LTM8078 μModule regulator. The demo board is designed to deliver dual 5V/1.4A and 3.3V/1.4A outputs from a 7V to 40V input. The Silent Switcher® architecture minimizes EMI while achieving high efficiency at frequencies up to 3MHz. The modes of operation (Burst Mode® operation or discontinuous mode/SYNC) are jumper selectable. Burst Mode operation improves efficiency at light loads.
The LTM8078 is a fixed frequency PWM regulator with current mode control scheme. The switching frequency is set by an appropriate resistor (R11) from the RT pin to ground. The RUN pin (RUN terminal) can be used to set the LTM8078 in micropower shutdown mode. Output tracking and soft-start pins (TRSS1/TRSS2) allow user control of output voltage ramp rate during start-up. The power good output of each channel (PG1 or PG2 terminal) will be low when that channel’s output voltage is outside of the ±7.5% regulation window.
The LTM8078 data sheet gives a complete description of the operation and application information. The data sheet must be read in conjunction with this demo manual.