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LT1619 Datasheet(PDF) 5 Page - Linear Technology |
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LT1619 Datasheet(HTML) 5 Page - Linear Technology |
5 / 28 page LTC4274 5 4274fa SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Timing Characteristics tDET Detection Time Beginning to End of Detection (Note 7) l 270 290 310 ms tDETDLY Detection Delay From PD Connected to Port to Detection Complete (Note 7) l 300 470 ms tCLE1 First Class Event Duration (Note 7) l 11 12 13 ms tME1 First Mark Event Duration (Notes 7, 11) l 6.8 8.6 10.3 ms tCLE2 Second Class Event Duration (Note 7) l 11 12 13 ms tME2 Second Mark Event Duration (Note 7) l 19 22 ms tCLE3 Third Class Event Duration CPORT = 0.6μF (Note 7) l 0.1 ms tPON Power On Delay in AUTO Pin Mode From End of Valid Detect to Application of Power to Port (Note 7) l 60 ms Turn On Rise Time (AGND – VOUT): 10% to 90% of (AGND – VEE), CPORT = 0.15μF (Note 7) l 15 24 μs Turn On Ramp Rate CPORT = 0.15μF (Note 7) l 10 V/μs Fault Delay From ICUT Fault to Next Detect l 1.0 1.1 s Midspan Mode Detection Backoff Rport = 15.5kΩ (Note 7) l 2.3 2.5 2.7 s Power Removal Detection Delay From Power Removal After tDIS to Next Detect (Note 7) l 1.0 1.3 2.5 s tSTART Maximum Current Limit Duration During Port Start-Up tSTART1 = 0, tSTART0 = 0 (Notes 7, 12) l 52 62.5 66 ms tLIM, tICUT Maximum Current Limit Duration After Port Start-Up tICUT1 = 0, tICUT0 = 0 (Notes 7, 12) l 52 62.5 66 ms Maximum Current Limit Duty Cycle (Note 7) l 5.8 6.3 6.7 % tMPS Maintain Power Signature (MPS) Pulse Width Sensitivity Current Pulse Width to Reset Disconnect Timer (Notes 7, 8) l 1.6 3.6 ms tDIS Maintain Power Signature (MPS) Dropout Time tconf [1:0] = 00b (Notes 5, 12) l 320 350 380 ms tMSD Masked Shut Down Delay (Note 7) l 6.5 μs tSHDN Port Shut Down Delay (Note 7) l 6.5 μs I2C Watchdog Timer Duration l 1.5 2 3 s Minimum Pulse Width for Masked Shut Down (Note 7) l 3μs Minimum Pulse Width for SHDN (Note 7) l 3μs Minimum Pulse Width for RESET (Note 7) l 4.5 μs ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. AGND – VEE = 54V, AGND = DGND, and VDD – DGND = 3.3V unless otherwise noted. (Notes 3, 4) |
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