LT3756/LT3756-1/LT3756-2 ELECTRICAL CHARACTERISTICSThe l denotes the specifications which apply over the full operatingtemperature range, otherwise specifications are at TA = 25°C. VIN = 24V, SHDN/UVLO = 24V, CTRL = 2V, PWM = 5V, unless otherwisenoted.PARAMETERCONDITIONSMINTYPMAXUNITS INTVCC Current Limit 14 17 23 mA INTVCC Current in Shutdown SHDN/UVLO = 0V, INTVCC = 7V 8 12 µA Logic Inputs/Outputs PWM Input High Voltage l 1.5 V PWM Input Low Voltage l 0.4 V PWM Pin Resistance to GND 45 60 kΩ PWMOUT Output Low (VOL) 0 50 mV PWMOUT Output High (VOH) INTVCC – V 0.05 SHDN/UVLO Threshold Voltage Falling E-, I-Grades l 1.185 1.220 1.245 V H Grade l 1.175 1.245 V J-Grade l 1.159 1.260 V SHDN/UVLO Rising Hysteresis 20 mV SHDN/UVLO Input Low Voltage IVIN Drops Below 1µA 0.4 V SHDN/UVLO Pin Bias Current Low SHDN/UVLO = 1.15V 1.7 2.05 2.5 µA SHDN/UVLO Pin Bias Current High SHDN/UVLO = 1.30V 10 100 nA OPENLED Output Low (VOL) IOPENLED = 0.5mA 200 mV (LT3756 and LT3756-2) SYNC Pin Resistance to GND LT3756-1 Only 30 kΩ SYNC Input High LT3756-1 Only 1.5 V SYNC Input Low LT3756-1 Only 0.4 V Gate Driver tr GATE Driver Output Rise Time CL = 3300pF 35 ns tf GATE Driver Output Fall Time CL = 3300pF 35 ns GATE Output Low (VOL) 0.05 V GATE Output High (VOH) INTVCC – V 0.05 Note 1: Stresses beyond those listed under Absolute Maximum Ratings Note 3: The LT3756 includes overtemperature protection that is intended may cause permanent damage to the device. Exposure to any Absolute to protect the device during momentary overload conditions. Junction Maximum Rating condition for extended periods may affect device temperature will exceed the maximum operating junction temperature reliability and lifetime. when overtemperature protection is active. Continuous operating above Note 2: The LT3756E, LT3756E-1 and LT3756E-2 are guaranteed to meet the specified maximum operating junction temperature may impair device performance specifications from 0°C to 125°C junction temperature. reliability. Specifications over the –40°C to 125°C operating junction temperature Note 4: GATE and PWMOUT pins are driven either to GND or INTVCC by range are assured by design, characterization and correlation with internal switches. Do not connect these pins externally to a power supply. statistical process controls. The LT3756I, LT3756I-1 and LT3756I-2 are guaranteed to meet performance specifications over the –40°C to 125°C operating junction temperature range. The LT3756H-2 and LT3755J-2 are guaranteed to meet performance specifications over the full –40°C to 150°C operating junction temperature range. High junction temperatures degrade operating lifetimes. Operating lifetime is derated at junction temperatures greater than 125°C. Rev. C For more information www.analog.com 5 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts
