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LTM8033 Datasheet(PDF) 10 Page - Linear Technology |
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LTM8033 Datasheet(HTML) 10 Page - Linear Technology |
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10 / 26 page  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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