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LTM8031
TYPICAL PERFORMANCE CHARACTERISTICS T A = 25°C, unless otherwise noted.
Radiated Emissions
Radiated Emissions
90
80
70
60
50
40
30
20
10
0
–10
V IN = 36V
V OUT = 10V AT 1A
EN55022
CLASS B
LIMIT
0 100 200 300 400 500 600 700 800 900 1000
FREQUENCY (MHz)
8031 G19
90
80
70
60
50
40
30
20
10
0
–10
V IN = 36V
V OUT = 2.5V AT 1A
EN55022
CLASS B
LIMIT
0 100 200 300 400 500 600 700 800 900 1000
FREQUENCY (MHz)
8031 G20
PIN FUNCTIONS
V IN (Bank 3): The V IN pin supplies current to the LTM8031’s
internal regulator and to the internal power switch. This
pin must be locally bypassed with an external, low ESR
capacitor of at least 1μF .
FIN (K3, L3): Filtered Input. This is the node after the input
EMI filter. Use this only if there is a need to modify the
behavior of the integrated EMI filter or if V IN rises or falls
rapidly; otherwise, leave these pins unconnected. See the
Applications Information section for more details.
GND (Bank 2): Tie these GND pins to a local ground plane
below the LTM8031 and the circuit components. Return
the feedback divider (R ADJ ) to this net.
V OUT (Bank 1): Power Output Pins. Apply the output filter
capacitor and the output load between these pins and
GND pins.
AUX (Pin H5): Low Current Voltage Source for BIAS. In
many designs, the BIAS pin is simply connected to V OUT .
The AUX pin is internally connected to V OUT and is placed
adjacent to the BIAS pin to ease printed circuit board rout-
ing. Although this pin is internally connected to V OUT , do
not connect this pin to the load. If this pin is not tied to
BIAS, leave it floating.
BIAS (Pin H4): The BIAS pin connects to the internal power
bus. Connect to a power source greater than 2.8V. If the
output is greater than 2.8V, connect this pin to AUX. If the
output voltage is less, connect this to a voltage source
between 2.8V and 25V. Also, make sure that BIAS + V IN
is less than 56V.
RUN/SS (Pin L5): Pull RUN/SS pin to less than 0.2V to
shut down the LTM8031. Tie to 2.5V or more for normal
operation. If the shutdown feature is not used, tie this pin
to the V IN pin. RUN/SS also provides a soft-start function;
see the Applications Information section.
RT (Pin G7): The RT pin is used to program the switching
frequency of the LTM8031 by connecting a resistor from
this pin to ground. The Applications Information section of
the data sheet includes a table to determine the resistance
value based on the desired switching frequency. Minimize
capacitance at this pin.
SHARE (Pin H7): Tie this to the SHARE pin of another
LTM8031 when paralleling the outputs.
8031fb
6
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