DESCRIPTION
Demonstration circuit 1868A is a dual step-down DC/DC
switching converter featuring the LTM®8024 μModule
regulator. The demo board is designed to deliver dual
5V/3A and 3.3V/3A 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 or Discontinuous Mode/SYNC)
are jumper selectable. Burst Mode operation improves
efficiency at light loads.
The LTM8024 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 pins (EN1/EN2 terminals) can be used
to set the LTM8024 in micro power shutdown mode. 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 LTM8024 data sheet gives a complete description of
the operation and application information. The data sheet
must be read in conjunction with this demo manual.