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LTC4267 Datasheet(PDF) 8 Page - Linear Technology |
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LTC4267 Datasheet(HTML) 8 Page - Linear Technology |
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8 / 32 page  LTC4267 8 4267f ITH/RUN (Pin 2/Pin 1): Current Threshold/Run Input. This pin performs two functions. It serves as the switching regulator error amplifier compensation point as well as the run/shutdown control input. Nominal voltage range is 0.7V to 1.9V. Forcing the pin below 0.28V with respect to PGND causes the controller to shut down. PGND (Pin 1, 8, 9, 16/Pin 2, 15): Switching Regulator Negative Supply. This pin is the negative supply rail for the switching regulator controller and must be tied to POUT. NGATE (Pin 3/Pin 3): Gate Driver Output. This pin drives the regulator’s external N-Channel MOSFET and swings from PGND to PVCC. PVCC (Pin 4/Pin 4): Switching Regulator Positive Supply. This pin is the positive supply rail for the switching regula- tor and must be closely decoupled to PGND. RCLASS(Pin5/Pin5):ClassSelectInput.Usedtosetthecur- rent value the PD maintains during classification. Connect a resistor between RCLASS and VPORTN (see Table 2). VPORTN (Pin 7/Pin 7): Negative Power Input. Tie to the –48V input port through the input diodes. POUT (Pin 10/Pin 10): Power Output. Supplies –48V to the switching regulator PGND pin and any additional PD loads through an internal power MOSFET that limits input current. POUT is high impedance until the voltage reaches the turn-on UVLO threshold. The output is then current limited. See the Application Information section. ⎯P⎯W⎯R⎯G⎯D (Pin 11/Pin 11):Power Good Output, Open-Drain. Indicates that the PD MOSFET is on and the switching regulator can start operation. Low impedance indicates power is good. ⎯P⎯W⎯R⎯G⎯D is high impedance during detec- tion, classification and in the event of a thermal overload. ⎯P⎯W⎯R⎯G⎯D is referenced to VPORTN. SIGDISA (Pin 12/Pin 12):Signature Disable Input. SIGDISA allows the PD to present an invalid signature resistance and remain inactive. Connecting SIGDISA to VPORTP lowers the signature resistance to an invalid value and disables all functions of the LTC4267. If unused, tie SIGDISA to VPORTN. VPORTP (Pin 13/Pin 13): Positive Power Input. Tie to the input port power return through the input diodes. SENSE (Pin 14/Pin 14): Current Sense. This pin performs two functions. It monitors the regulator switch current by reading the voltage across an external sense resistor. It also injects a current ramp that develops a slope compensation voltage across an optional external programming resistor. See the Applications Information section. VFB (Pin 15/Pin 16): Feedback Input. Receives the feed- back voltage from the external resistor divider across the output. NC (Pin 6/Pin 6, 8, 9): No Internal Connection. Backside Connection (DHC Only, Pin 17): Exposed Pad. This exposed pad must be soldered to an electrically isolated and thermally conductive PC board heat sink. (GN/DHC) PI FU CTIO S |
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