LT3975 ELECTRICAL CHARACTERISTICSThe l denotes the specifications which apply over the full operatingtemperature range, otherwise specifications are at TA = 25°C. (Note 2) PARAMETERCONDITIONSMINTYPMAXUNITS Switch Current Limit VFB = 1V 4 5.4 6.8 A Foldback Switch Current Limit VFB = 0V 3.3 A Switch VCESAT ISW = 1A 80 mV Switch Leakage Current 0.02 1 μA Boost Schottky Forward Voltage ISH = 100mA 730 mV Boost Schottky Reverse Leakage VREVERSE = 12V 0.02 2 μA Minimum Boost Voltage (Note 5) l 1.3 1.8 V BOOST Pin Current ISW = 1A, VBOOST – VSW = 3V 20 32 mA EN Voltage Threshold EN Falling, VIN ≥ 4.3V l 0.92 1.02 1.12 V EN Voltage Hysteresis 60 mV EN Pin Current 0.2 20 nA PG Threshold Offset from VFB VFB Falling 5 8.4 13 % PG Hysteresis as % of Output Voltage 1.7 % PG Leakage VPG = 3V 0.02 1 µA PG Sink Current VPG = 0.4V l 125 480 μA SYNC Low Threshold 0.6 1.0 V SYNC High Threshold 1.18 1.5 V SYNC Pin Current VSYNC = 6V 0.1 nA SS Source Current VSS = 0.5V 0.9 1.8 2.6 μA Note 1: Stresses beyond those listed under Absolute Maximum Ratings Note 3: Minimum input voltage depends on application circuit. may cause permanent damage to the device. Exposure to any Absolute Note 4: The LT3975 contains circuitry that extends the maximum duty Maximum Rating condition for extended periods may affect device cycle if there is sufficient voltage across the boost capacitor. See the reliability and lifetime. Application Information section for more details. Note 2: The LT3975E is guaranteed to meet performance specifications Note 5: This is the minimum voltage across the boost capacitor needed to from 0°C to 125°C junction temperature. Specifications over the –40°C guarantee full saturation of the switch. to 125°C operating junction temperature range are assured by design, Note 6: This IC includes overtemperature protection that is intended characterization, and correlation with statistical process controls. The to protect the device during momentary overload conditions. Junction LT3975I is guaranteed over the full –40°C to 125°C operating junction temperature will exceed the maximum operating junction temperature temperature range. The LT3975H is guaranteed over the full –40°C to when overtemperature protection is active. Continuous operation above 150°C operating junction temperature range. High junction temperatures the specified maximum operating junction temperature may impair device degrade operating lifetimes. Operating lifetime is derated at junction reliability or permanently damage the device. temperatures greater than 125°C. The junction temperature (TJ, in °C) is calculated from the ambient temperature (TA, in °C) and power dissipation (PD, in Watts) according to the formula: TJ = TA + (PD • θJA) where θJA (in °C/W) is the package thermal impedance. 3975f 3 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION ELECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS BLOCK DIAGRAM OPERATION APPLICATIONS INFORMATION TYPICAL APPLICATIONS PACKAGE DESCRIPTION TYPICAL APPLICATION RELATED PARTS
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