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LT8331 Datasheet(HTML) 3 Page - Analog Devices |
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LT8331 Datasheet(HTML) 3 Page - Analog Devices |
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LT8331 3 Rev. C For more information www.analog.com ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, EN/UVLO = 12V unless otherwise noted. 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: INTVCC cannot be externally driven. No external loading is allowed on this pin. Note 3: The LT8331E is guaranteed to meet performance specifications from 0°C to 125°C junction temperature. Specifications over the –40°C to 125°C operating junction temperature range are assured by design, characterization and correlation with statistical process controls. The LT8331I is guaranteed over the full –40°C to 125°C operating junction temperature range. High junction temperatures degrade operating lifetimes. Operating lifetime is derated at junction temperatures greater than 125°C. Note 4: The IC includes overtemperature protection that is intended to protect the device during overload conditions. Junction temperature will exceed 150°C when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature will reduce lifetime. PARAMETER CONDITIONS MIN TYP MAX UNITS BIAS Threshold Rising, BIAS Can Supply INTVCC Falling, BIAS Cannot Supply INTVCC l l 4.10 3.725 4.4 4 4.65 4.275 V V VIN Falling Threshold to Supply INTVCC BIAS = 12V BIAS – 1.6V V BIAS Falling Threshold to Supply INTVCC VIN = 12V VIN – 0.4V V FBX Regulation FBX Regulation Voltage FBX > 0V FBX < 0V l l 1.568 –0.820 1.6 –0.80 1.632 –0.780 V V FBX Line Regulation FBX > 0V, 4.5V < VIN < 100V FBX < 0V, 4.5V < VIN < 100V 0.005 0.005 0.015 0.015 %/V %/V FBX Pin Current FBX = 1.6V, –0.8V l –10 10 nA Oscillator Switching Frequency (fOSC) RT = 301k RT = 100k RT = 56.2k l l l 92 279 465 100 300 500 107 321 535 kHz kHz kHz Minimum On-Time SYNC = 0V SYNC = INTVCC 165 160 290 290 ns ns Minimum Off-Time 146 230 ns SYNC/Mode, Mode Thresholds Rising to Select Pulse Skipping Mode Falling to Select Burst Mode Operation l l 0.6 2.4 V V SYNC/Mode, Clock Thresholds Rising Falling 0.6 2.0 1.1 2.4 V V fSYNC/fOSC Allowed Ratio RT = 100k 0.95 1 1.25 kHz SYNC Pin Current SYNC = 2V –40 40 nA Switch Maximum Switch Current Limit Threshold l 0.5 0.6 0.7 A Switch Overcurrent Threshold Discharges SS Pin 1.15 A Switch RDS(ON) ISW = 0.25A 1.7 Ω Switch Leakage Current VSW = 140V 0.1 1 µA EN/UVLO Logic EN/UVLO Pin Threshold (Rising) Start Switching l 1.576 1.74 1.90 V EN/UVLO Pin Threshold (Falling) Stop Switching l 1.556 1.6 1.644 V EN/UVLO Pin Current VEN/UVLO = 1.6V l –40 40 nA Soft-Start Soft-Start Charge Current SS = 1V 2 µA Soft-Start Pull-Down Resistance Fault Condition, SS = 0.1V 250 Ω |
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