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LTC4251 Datasheet(PDF) 4 Page - Linear Technology |
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LTC4251 Datasheet(HTML) 4 Page - Linear Technology |
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4 / 34 page  LTC4253/LTC4253A 4 425353afe ELECTRICAL CHARACTERISTICS 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. The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. SYMBOL PARAMETER CONDITIONS LTC4253 LTC4253A UNITS MIN TYP MAX MIN TYP MAX VOV OV Pin Threshold OV Low to High ● 5.04 5.09 5.14 V VOVHST OV Pin Hysteresis ● 230 300 350 82 102 122 mV mV ISENSE SENSE Pin Input Current UV = 0V = 4V, VSENSE = 50mV (Sourcing) ● 15 30 15 30 μA IINP UV, OV Pin Input Current UV = OV = 4V ● ± 0.1 ±1 ±0.1 ±1 μA VTMRH TIMER Pin Voltage High Threshold ● 3.5 4 4.5 3.5 4 4.5 V VTMRL TIMER Pin Voltage Low Threshold ● 0.8 1 1.2 0.8 1 1.2 V ITMR TIMER Pin Current Timer On (Initial Cycle/Latchoff, Sourcing), VTMR = 2V ● 357357 μA Timer Off (Initial Cycle, Sinking), VTMR = 2V 28 28 mA Timer On (Circuit Breaker, Sourcing, IDRN = 0μA), VTMR = 2V ● 120 200 280 120 200 280 μA Timer On (Circuit Breaker, Sourcing, IDRN = 50μA), VTMR = 2V 600 600 μA Timer Off (Circuit Breaker, Sinking), VTMR = 2V ● 357357 μA ΔITMRACC ΔIDRN ITMR at IDRN = 50μA – ITMR at IDRN = 0μA 50μA Timer On (Circuit Breaker with IDRN = 50μA) ● 789789 μA/μA VSQTMRH SQTIMER Pin Voltage High Threshold ● 3.5 4 4.5 3.5 4 4.5 V VSQTMRL SQTIMER Pin Voltage Low Threshold 0.33 0.33 V ISQTMR SQTIMER Pin Current SQTIMER On (Power Good Sequence, Sourcing), VSQTMR = 2V ● 357357 μA SQTIMER Off (Power Good Sequence, Sinking), VSQTMR = 2V 28 28 mA VDRNL DRAIN Pin Voltage Low Threshold For PWRGD1, PWRGD2, PWRGD3 Status ● 2 2.39 3 2 2.39 3 V IDRNL DRAIN Leakage Current VDRAIN = 5V VDRAIN = 4V ± 0.1 ±1 ± 0.1 ±1 μA μA VDRNCL DRAIN Pin Clamp Voltage IDRN = 50μA ● 67 8.5 56 7.5 V VPGL PWRGD1, PWRGD2, PWRGD3 Output Low Voltage IPG = 1.6mA IPG = 5mA ● ● 0.25 0.4 1.2 0.25 0.4 1.2 V V IPGH PWRGD1, PWRGD2, PWRGD3 Output High Current VPG = 0V (Sourcing) ● 30 50 70 30 50 70 μA tSQ SQTIMER Default Ramp Period SQTIMER Pin Floating, VSQTMR Ramps from 0.5V to 3.5V 250 250 μs tSS SS Default Ramp Period SS Pin Floating, VSS Ramps from 0.2V to 2V SS Pin Floating, VSS Ramps from 0.2V to 1.25V 250 140 μs μs tPLLUG UV Low to GATE Low ● 0.4 5 0.4 5 μs tPHLOG OV High to GATE Low ● 0.4 5 0.4 5 μs Note 2: All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to VEE unless otherwise specified. |
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