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LTC4252-2CMS Datasheet(PDF) 3 Page - Linear Technology |
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LTC4252-2CMS Datasheet(HTML) 3 Page - Linear Technology |
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3 / 36 page  LTC4252-1/LTC4252-2 LTC4252A-1/LTC4252A-2 3 425212fb LTC4252-1/-2 LTC4252A-1/-2 SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS VZ VIN – VEE Zener Voltage IIN = 2mA ● 11.5 13 14.5 11.5 13 14.5 V rZ VIN – VEE Zener Dynamic Impedance IIN = 2mA to 30mA 5 5 Ω IIN VIN Supply Current UV = OV = 4V, VIN = (VZ – 0.3V) ● 0.8 2 0.9 2 mA VLKO VIN Undervoltage Lockout Coming Out of UVLO (Rising VIN) ● 9.2 11.5 9 10 V VLKH VIN Undervoltage Lockout Hysteresis 1 0.5 V VCB Circuit Breaker Current Limit Voltage VCB = (VSENSE – VEE) ● 40 50 60 45 50 55 mV VACL Analog Current Limit Voltage VACL = (VSENSE – VEE), ● 80 100 120 mV SS = Open or 2.2V VACL Analog Current Limit Voltage VACL = (VSENSE – VEE), ● 1.05 1.20 1.38 V/V VCB Circuit Breaker Voltage SS = Open or 1.4V VFCL Fast Current Limit Voltage VFCL = (VSENSE – VEE) ● 150 200 300 150 200 300 mV VSS SS Voltage After End of SS Timing Cycle 2.2 1.4 V RSS SS Output Impedance 100 50 k Ω ISS SS Pin Current UV = OV = 4V, VSENSE = VEE,22 28 µA VSS = 0V (Sourcing) UV = OV = 0V, VSENSE = VEE,28 28 mA VSS = 2V (Sinking) VOS Analog Current Limit Offset Voltage 10 10 mV VACL+VOS Ratio (VACL + VOS) to SS Voltage 0.05 0.05 V/V VSS IGATE GATE Pin Output Current UV = OV = 4V, VSENSE = VEE, ● 40 58 80 40 58 80 µA VGATE = 0V (Sourcing) UV = OV = 4V, VSENSE – VEE = 0.15V, 17 17 mA VGATE = 3V (Sinking) UV = OV = 4V, VSENSE – VEE = 0.3V, 190 190 mA VGATE = 1V (Sinking) VGATE External MOSFET Gate Drive VGATE – VEE, IIN = 2mA ● 10 12 VZ 10 12 VZ V VGATEH Gate High Threshold VGATEH = VIN – VGATE, IIN = 2mA, 2.8 2.8 V for PWRGD Status (MS Only) VGATEL Gate Low Threshold (Before Gate Ramp-Up) 0.5 0.5 V VUVHI UV Pin Threshold HIGH ● 3.075 3.225 3.375 V VUVLO UV Pin Threshold LOW ● 2.775 2.925 3.075 V VUV UV Pin Threshold Low-to-High Transition ● 3.05 3.08 3.11 V VUVHST UV Pin Hysteresis ( ● for LTC4252A Only) ● 300 292 324 356 mV VOVHI OV Pin Threshold HIGH ● 5.85 6.15 6.45 V VOVLO OV Pin Threshold LOW ● 5.25 5.55 5.85 V VOV OV Pin Threshold Low-to-High Transition ● 5.04 5.09 5.14 V VOVHST OV Pin Hysteresis ( ● for LTC4252A Only) ● 600 82 102 122 mV ISENSE SENSE Pin Input Current UV = OV = 4V, VSENSE = 50mV ● –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 4 4 V VTMRL TIMER Pin Voltage Low Threshold 1 1 V ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 2) |
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