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LTM8073 Datasheet(PDF) 10 Page - Linear Technology

No. de pieza LTM8073
Descripción Electrónicos  60VIN, 3A Silent Switcher 關Module Regulator
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Fabricante Electrónico  LINER [Linear Technology]
Página de inicio  http://www.linear.com
Logo LINER - Linear Technology

LTM8073 Datasheet(HTML) 10 Page - Linear Technology

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LTM8073
10
8073fa
For more information www.linear.com/LTM8073
Typical perForMance characTerisTics
CISPR22 Class B Radiated
DC2389A Demo Board, VOUT = 5V
No Filter (FB1 Short, C8, C9 Open)
CISPR22 Class B Radiated
DC2389A Demo Board, VOUT = 5V
No Filter (FB1 Short, C8, C9 Open)
TA = 25°C, unless otherwise noted.
fSW = 1.2MHz, VIN = 28V, IOUT = 3.5A
CLASS B LIMIT
HORIZONTAL
VERTICAL
FREQUENCY (MHz)
0
200
400
600
800
1000
–10
0
10
20
30
40
50
8073 G55
fSW = 1.2MHz, VIN = 14V, IOUT = 3.5A
CLASS B LIMIT
HORIZONTAL
VERTICAL
FREQUENCY (MHz)
0
200
400
600
800
1000
–10
0
10
20
30
40
50
8073 G56
pin FuncTions
GND (Bank 1, A1, A6, B3): Tie these GND pins to a
local ground plane below the LTM8073 and the circuit
components. In most applications, the bulk of the heat
flow out of the LTM8073 is through these pads, so the
printed circuit design has a large impact on the ther-
mal performance of the part. See the PCB Layout and
Thermal Considerations sections for more details.
VIN (Bank 2): VIN supplies current to the LTM8073’s
internal regulator and to the internal power switch. These
pins must be locally bypassed with an external, low ESR
capacitor; see Table 1 for recommended values.
VOUT (Bank 3): Power Output Pins. Apply the output
filter capacitor and the output load between these pins
and GND pins.
BIAS (Pin A2): The BIAS pin connects to the internal
power bus. Connect to a power source greater than 3.2V.
If VOUT is greater than 3.2V, connect this pin to AUX.
Decouple this pin with at least 1µF if the voltage source
for BIAS is remote.
PG (Pin A3): The PG pin is the open-collector output
of an internal comparator. PG remains low until the FB
pin voltage is between 0.73V and 0.88V typical. The PG
signal is valid when VIN is above 3.4V. If VIN is above
3.4V and RUN is low, PG will drive low. If this function
is not used, leave this pin floating.
SHARE (Pin A4): Tie this to the SHARE pin of another
LTM8073 to load share. Otherwise leave floating. Do not
drive this pin.
RT (Pin A5): The RT pin is used to program the switching
frequency of the LTM8073 by connecting a resistor from
this pin to ground. The Applications Information section
of the data sheet includes a table to determine the resis-
tance value based on the desired switching frequency.
Minimize capacitance at this pin. Do not drive this pin.
FB (Pin B1): The LTM8073 regulates its FB pin to 0.8V.
Connect the adjust resistor from this pin to ground. The
value of RFB is given by the equation RFB = 199.7/(VOUT
– 0.8), where RFB is in kΩ.


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