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LT3645 Datasheet(PDF) 4 Page - Linear Technology |
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LT3645 Datasheet(HTML) 4 Page - Linear Technology |
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4 / 24 page  LT3645 4 3645f Buck Minimum Input Voltage, VOUT = 3.3V Efficiency VOUT = 5V Efficiency VOUT = 3.3V Buck Minimum Input Voltage, VOUT = 5V PARAMETER CONDITIONS MIN TYP MAX UNITS FB NPG Threshold, % of Regulation Voltage VFB2 = 800mV, VFB Rising 88 90 92 % NPG Threshold Hysteresis 25 mV ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, BOOST = 15.3V, VCC2 = 3.3V, OUT2 = 1.8V unless otherwise noted. (Notes 2, 3) Note1: 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 LT3645E is guaranteed to meet performance specifications from 0°C to 125°C. Specifications over the –40°C to 125°C operating temperature range are assured by design, characterization and correlation with statistical process controls. The LT3645I is guaranteed over the full –40°C to 125°C operating temperature range. The LT3645H is guaranteed over the full –40°C to 150°C operating temperature range. High junction temperatures degrade operating lifetimes. Operating lifetime is derated at junction temperatures greater than 125°C. Note 3: This IC includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature will exceed the maximum junction operating temperature when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature may result in device degradation or failure. Note 4: Current Measurements are performed when the outputs are not switching. Slope compensation reduces current limit at high duty cycles. Note 5: Absolute Maximum Voltage at VIN and EN/UVLO pins is 55V for nonrepetitive one second transients, and 36V for continuous operation. FB2 Voltage TYPICAL PERFORMANCE CHARACTERISTICS OUTPUT CURRENT (mA) 0 50 60 70 80 90 100 200 300 3645 G01 400 500 VIN = 7V VIN = 12V VIN = 24V LOAD CURRENT (mA) 0 50 60 70 80 90 100 200 300 3645 G02 400 500 VIN = 7V VIN = 12V VIN = 24V OUTPUT CURRENT (mA) 1 5.0 5.5 6.5 6.0 7.5 7.0 8.0 10 100 3645 G03 1000 VIN TO RUN VIN TO START TEMPERATURE (°C) –50 –30 –10 794 796 799 798 797 795 800 801 802 803 804 10 30 50 70 90 130 3645 G05 110 150 FB Voltage TEMPERATURE (°C) –50 0 794 795 797 796 798 799 800 50 3645 G06 100 150 OUTPUT CURRENT (mA) 1 3.0 4.0 3.5 5.0 4.5 6.0 5.5 6.5 10 100 3645 G04 1000 VIN TO RUN VIN TO START |
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