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LTM8003 데이터시트(PDF) 14 Page - Linear Technology |
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LTM8003 데이터시트(HTML) 14 Page - Linear Technology |
14 / 30 page LTM8003 14 8003fc For more information www.linear.com/LTM8003 PIN FUNCTIONS GND(Bank1,A1,A6):TietheseGNDpinstoalocalground plane below the LTM8003 and the circuit components. In most applications, the bulk of the heat flow out of the LTM8003 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 LTM8003’s in- ternal 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 (Pins G1, G2): The BIAS pin connects to the internal power bus. Connect to a power source greater than 3.2V and less than 18V. If VOUT is greater than 3.2V, connect this pin there. If the output voltage is less, connect this to a voltage source above 3.2V. Decouple this pin with at least 1µF if the voltage source for BIAS is remote. If unused or generating a negative output, tie BIAS to LTM8003 GND. RUN (Pins B5, B6): Pull the RUN pin below 0.9V to shut down the LTM8003. Tie to 1.06V or more for normal operation. If the shutdown feature is not used, tie this pin to the VIN pin. RT (Pins A4, A5): The RT pin is used to program the switchingfrequencyoftheLTM8003byconnectingaresis- tor from this pin to ground. The Applications Information section of the data sheet includes a table to determine the resistancevaluebasedonthedesiredswitchingfrequency. Minimize capacitance at this pin. Do not drive this pin. SYNC (Pins A2, B2): External clock synchronization input and operational mode. This pin programs four different operating modes: 1. Burst Mode®. Tie this pin to ground for Burst Mode operationatlowoutputloads—thiswillresultinultralow 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, C1): 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 CISPR25 Class 5 Peak Radiated DC2416A Demo Board, VOUT = 5V Spread Spectrum Enabled CISPR25 Class 5 Average Radiated DC2416A Demo Board, VOUT = 5V Spread Spectrum Enabled fSW = 2MHz IOUT = 3.5A FREQUENCY (MHz) 0 200 400 600 800 1000 –10 0 10 20 30 40 50 8053 G91 VERTICAL POLARIZATION fSW = 2MHz IOUT = 3.5A FREQUENCY (MHz) 0 200 400 600 800 1000 –10 0 10 20 30 40 50 8053 G92 TYPICAL PERFORMANCE CHARACTERISTICS T A = 25°C, unless otherwise noted. |
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