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LT3756 Datasheet(PDF) 5 Page - Analog Devices |
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LT3756 Datasheet(HTML) 5 Page - Analog Devices |
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5 / 26 page  LT3756/LT3756-1/LT3756-2 5 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 = 24V, SHDN/UVLO = 24V, CTRL = 2V, PWM = 5V, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS 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 – 0.05 V SHDN/UVLO Threshold Voltage Falling E-, I-Grades H Grade J-Grade l l l 1.185 1.175 1.159 1.220 1.245 1.245 1.260 V V 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 (LT3756 and LT3756-2) 200 mV 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 – 0.05 V 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: The LT3756E, LT3756E-1 and LT3756E-2 are 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 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. Note 3: The LT3756 includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature will exceed the maximum operating junction temperature when overtemperature protection is active. Continuous operating above the specified maximum operating junction temperature may impair device reliability. Note 4: GATE and PWMOUT pins are driven either to GND or INTVCC by internal switches. Do not connect these pins externally to a power supply. |
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