LTM8031EVPBF datasheet(6/20 Pages) LINER

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LTM8031

8031fa

TYPICAL PERFORMANCE CHARACTERISTICS

Radiated Emissions

TA = 25°C, unless otherwise noted.

PIN FUNCTIONS

VIN (Bank 3): The VIN 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 VIN 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 (RADJ) to this net.

VOUT (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 VOUT.

The AUX pin is internally connected to VOUT and is placed

adjacent to the BIAS pin to ease printed circuit board rout-

ing. Although this pin is internally connected to VOUT, 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 + VIN

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 VIN 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.

FREQUENCY (MHz)

VIN = 36V

VOUT = 10V AT 1A

800

8031 G19

–10

200

100

400

300

600 700

900

500

1000

EN55022

CLASS B

LIMIT

FREQUENCY (MHz)

VIN = 36V

VOUT = 2.5V AT 1A

800

8031 G20

–10

200

100

400

300

600 700

900

500

1000

EN55022

CLASS B

LIMIT

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