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3506AEFE Datasheet(PDF) 5 Page - Linear Technology |
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3506AEFE Datasheet(HTML) 5 Page - Linear Technology |
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5 / 24 page  LT3506/LT3506A 3506afb TEMPERATURE ( °C) –50 0 0.5 1.0 1.5 2.0 3.0 –25 0 25 50 3506 G12 75 100 125 2.5 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 TEMPERATURE ( °C) –50 25 75 3506 G13 –25 0 50 100 125 TO SWITCH TO RUN IRUN/SS vs Temperature RUN/SS Thresholds vs Temperature TYPICAL PERFOR A CE CHARACTERISTICS BOOST1 (Pin 1), BOOST2 (Pin 8): The BOOST pins are used to provide drive voltages, higher than the input voltage, to the internal bipolar NPN power switches. Tie through a diode from VOUT or from VIN. SW1 (Pin 2), SW2 (Pin 7): The SW pins are the outputs of the internal power switches. Connect these pins to the inductors, catch diodes and boost capacitors. VIN1 (Pins 3, 4): The VIN1 pins supply current to the LT3506’s internal regulator and to the internal power switch connected to SW1. These pins must be locally bypassed. VIN2 (Pins 5, 6): The VIN2 pins supply current to the inter- nal power switch connected to SW2 and must be locally bypassed.ConnectthesepinsdirectlytoVIN1unlesspower for Channel 2 is coming from a different source. RUN/SS1 (Pin 13), RUN/SS2 (Pin 12): The RUN/SS pins are used to shut down the individual switching regula- tors and the internal bias circuits. They also provide a soft-start function. To shut down either regulator, pull the RUN/SS pin to ground with an open drain or collector. Tie a capacitor from these pins to ground to limit switch current during start-up. If neither feature is used, leave these pins unconnected. PG1 (Pin 14), PG2 (Pin 11): The Power Good pins are the open collector outputs of an internal comparator. PG remains low until the FB pin is within 10% of the final regulation voltage. As well as indicating output regulation, the PG pins can be used to sequence the two switching regulators. These pins can be left unconnected. The PG outputs are valid when VIN is greater than 3.4V and either of the RUN/SS pins is high. The PG comparators are disabled in shutdown. VC1 (Pin 15), VC2 (Pin 10): The VC pins are the outputs of the internal error amps. The voltages on these pins control the peak switch currents. These pins are normally used to compensate the control loops, but can also be used to override the loops. Pull these pins to ground with an open drain to shut down each switching regulator. FB1 (Pin 16), FB2 (Pin 9): The LT3506 regulates each feedback pin to 800mV. Connect the feedback resistor divider taps to these pins. Exposed Pad (Pin 17): The Exposed Pad of the package providesbothelectricalcontacttogroundandgoodthermal contact to the printed circuit board. The Exposed Pad must be soldered to the circuit board for proper operation. PI FU CTIO S |
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