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LT3685 Datasheet(PDF) 7 Page - Linear Technology |
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LT3685 Datasheet(HTML) 7 Page - Linear Technology |
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7 / 24 page  LT3505 7 3505fc PIN FUNCTIONS BOOST (Pin 1): The BOOST pin is used to provide a drive voltage,higherthantheinputvoltage,totheinternalbipolar NPN power switch. SW (Pin 2): The SW pin is the output of the internal power switch. Connect this pin to the inductor, catch diode and boost capacitor. VIN (Pin 3): The VIN pin supplies current to the LT3505’s internal regulator and to the internal power switch. This pin must be locally bypassed. SHDN (Pin 4): The SHDN pin is used to put the LT3505 in shutdown mode. Tie to ground to shut down the LT3505. Tie to 2.3V or more for normal operation. If the shutdown feature is not used, tie this pin to the VIN pin. SHDN also provides a soft-start function; see the Applications Infor- mation section. GND (Pin 5): Tie the GND pin to a local ground plane below the LT3505 and the circuit components. Return the feedback divider to this pin. RT (Pin 6): The RT pin is used to program the switching frequency of the LT3505 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. FB(Pin7):TheLT3505regulatesitsfeedbackpinto780mV. Connect the feedback resistor divider tap to this pin. Set the output voltage by selecting R1 according to: R R V V OUT 1 2 0 78 1 = . – A good value for R2 is 10.0k. VC (Pin 8): The VC pin is used to compensate the LT3505 control loop by tying an external RC network from this pin to ground. Exposed Pad (Pin 9): The Exposed Pad must be soldered to the PCB and electrically connected to ground. Use a large ground plane and thermal vias to optimize thermal performance. |
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