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LTM8063 Fiches technique(PDF) 10 Page - Linear Technology |
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LTM8063 Fiches technique(HTML) 10 Page - Linear Technology |
10 / 24 page 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. |
Numéro de pièce similaire - LTM8063 |
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Description similaire - LTM8063 |
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