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LTC4259A-1 Datasheet(PDF) 4 Page - Linear Technology |
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LTC4259A-1 Datasheet(HTML) 4 Page - Linear Technology |
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4 / 24 page  LTC4263 4 4263fe SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS AVACD Voltage Gain OSC to ACOUT 2V ≤ (VOSC – VSS) ≤ 3V l 0.95 1.0 1.05 V/V IACDMAX AC Disconnect Output Current VOSC – VSS = 2V, 0V ≤ (VACOUT – VSS) ≤ 4V l –1 1 mA IACDMIN Remain Connected AC Pin Current VOSC – VSS = 2V l 130 160 190 μA VACDEN AC Disconnect Enable Signal VOSC – VSS, Port On l 1.5 V Digital Interface (Note 10) VOLED LED Output Low Voltage ILED = 10mA l 1.1 2.2 V VILD Digital Input Low Voltage MIDSPAN, PWRMGT, ENFCLS, SD LEGACY l l 0.8 0.4 V V VIHD Digital Input High Voltage MIDSPAN, PWRMGT, ENFCLS, SD LEGACY l l 2.2 2.2 V VOZ Voltage of Legacy Pin if Left Floating l 1.1 1.25 1.4 V IOLEG Current In/Out of Legacy Pin 0V ≤ (VLEGACY – VSS) ≤ 5V l –60 60 μA IFLT Maximum Allowed Leakage of External Components at Legacy Pin in Force Power-On Mode l –10 10 μA Timing Characteristics tDET Detection Time Beginning to End of Detection l 270 290 310 ms tDETDLY Detection Delay PD Insertion to Detection Complete l 300 620 ms tPDC Classification Duration l 34 37 39 ms tPON Power Turn-On Delay End of Valid Detect to Application of Power l 135 145 155 ms tRISE Turn-On Rise Time VDD48 – VOUT: 10% to 90% CPSE = 0.1μF l 40 170 μs tOVLD Overload/Short-Circuit Time Limit l 52 62 72 ms tED Error Delay ICUT Fault to Next Detect l 3.8 4.0 4.2 s tMPDO Maintain Power Signature (MPS) Disconnect Delay PD Removal to Power Removal l 320 350 380 ms tMPS MPS Minimum Pulse Width PD Minimum Current Pulse Width Required to Stay Connected (Note 11) l 20 ms tDBO Midspan Mode Detection Backoff RPORT = 15.5kΩ l 3.0 3.2 3.4 s tDISDLY Power Removal Detection Delay l 0.8 0.95 1.1 s ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VDD48 – VSS = 48V and VDD5 not driven externally. All voltages are relative to VSS unless otherwise noted. (Notes 2, 5) Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to VSS unless otherwise specified. Note 3: 80mA of current may be pulled from the OUT or ACOUT pin without damage whether the LTC4263 is powered or not. These pins will also withstand a positive voltage of VSS + 80V. Note 4: This IC includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature will exceed 125°C when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature may impair device reliability. Note 5: The LTC4263 operates with a negative supply voltage. To avoid confusion, voltages in this data sheet are referred to in terms of absolute magnitude. Note 6: If the ENFCLS pin is high, ICUT depends on the result of classification. If ENFCLS pin is low, ICUT reverts to its Class 0 specification. Note 7: In order to reduce power dissipated in the switch while charging the PD, the LTC4263 reduces the current limit when VOUT – VSS is large. Refer to the Typical Performance Characteristics for more information. Note 8: The LTC4263 includes a high speed current limit circuit intended to protect against faults. The fault protection is activated for port current in excess of IFAULT. After the high speed current limit activates, the short- circuit current limit (ILIM) engages and restricts current to IEEE 802.3af levels. Note 9: Class 4 or higher classification current is treated as Class 3. Note 10: The LTC4263 digital interface operates with respect to VSS. All logic levels are measured with respect to VSS. Note 11: The IEEE 802.3af specification allows a PD to present its Maintain Power Signature (MPS) on an intermittent basis without being disconnected. In order to stay powered, the PD must present the MPS for tMPS within any tMPDO time window. |
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