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LTM8063 Fiches technique(PDF) 10 Page - Linear Technology

No de pièce LTM8063
Description  40VIN, 2A Silent Switcher 關Module Regulator
Download  24 Pages
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Fabricant  LINER [Linear Technology]
Site Internet  http://www.linear.com
Logo LINER - Linear Technology

LTM8063 Fiches technique(HTML) 10 Page - Linear Technology

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LTM8063
10
8063fa
For more information www.linear.com/LTM8063
PIN FUNCTIONS
GND(Bank1,A1,A4):TietheseGNDpinstoalocalground
plane below the LTM8063 and the circuit components.
In most applications, the bulk of the heat flow out of the
LTM8063 is through these pads, so the printed circuit
design has a large impact on the thermal performance of
the part. See the PCB Layout and Thermal Considerations
sections for more details.
VIN (Bank 2): VIN supplies current to the LTM8063’s in-
ternal regulator and to the internal power switches. 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.
RUN (Pin B3): Pull the RUN pin below 0.9V to shut down
the LTM8063. Tie to 1.2V or more for normal operation. If
the shutdown feature is not used, tie this pin to the VIN pin.
RT (Pin C1): The RT pin is used to program the switching
frequency of the LTM8063 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. Do not drive this pin.
SYNC (Pin B2): External clock synchronization input
and operational mode. This pin programs four different
operating modes:
1. Burst Mode® Operation. Tie this pin to ground for Burst
Mode operation at low output loads—this will result in
ultralow quiescent current.
2. Pulse-skipping mode. Float this pin for pulse-skipping
mode. This mode offers full frequency operation down
to low output loads before pulse skipping occurs.
3. Spread spectrum mode. Tie this pin high (between
2.9V and 4.2V) for pulse-skipping mode with spread
spectrum modulation.
4. Synchronizationmode.Drivethispinwithaclocksource
tosynchronizetoanexternalfrequency.Duringsynchro-
nization the part will operate in pulse-skipping mode.
PG (Pin B1): The PG pin is the open-collector output of
an internal comparator. PG remains low until the FB pin
voltage is within about 10% of the final regulation volt-
age. The PG signal is valid when VIN is above 3.2V. If VIN
is above 3.2V and RUN is low, PG will drive low. If this
function is not used, leave this pin floating.
FB (Pin A2): The LTM8063 regulates its FB pin to 0.77V.
Connect the adjust resistor from this pin to ground.
The value of RFB is given by the equation RFB = 192.73/
(VOUT – 0.774), where RFB is in kΩ.
TR/SS (Pin A3): The TR/SS pin is used to provide a soft-
start or tracking function. The internal 2μA pull-up current
in combination with an external capacitor tied to this pin
creates a voltage ramp. If TR/SS is less than about 0.77V,
the FB voltage tracks to this value. The soft-start ramp time
is approximated by the equation t = 0.39 • C where C is
in μF. For tracking, tie a resistor divider to this pin from the
tracked output. This pinis pulled toground withan internal
MOSFETduringshutdownandfaultconditions;useaseries
resistor if driving from a low impedance output. This pin
may be left floating if the tracking function is not needed.


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