LT8390A ELECTRICAL CHARACTERISTICSThe l denotes the specifications which apply over the full operatingtemperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 12V, VEN/UVLO = 1.5V unless otherwise noted. PARAMETERCONDITIONSMINTYPMAXUNITSOscillator RT Pin Voltage RT = 100kΩ 1.00 V Switching Frequency VSYNC/SPRD = 0V, RT = 226kΩ 645 685 725 kHz VSYNC/SPRD = 0V, RT = 100kΩ 1290 1360 1430 kHz VSYNC/SPRD = 0V, RT = 59.0kΩ l 1900 2000 2100 kHz SYNC Frequency 600 2100 kHz SYNC/SPRD Input Bias Current VSYNC/SPRD = 5V –0.1 0 0.1 µA SYNC/SPRD Threshold Voltage 0.4 1.5 V Highest Spread Spectrum Above Oscillator Frequency VSYNC/SPRD = 5V 21 23 25 % Region Transition Buck-Boost to Boost (VIN/VOUT) 0.73 0.75 0.77 Boost to Buck-Boost (VIN/VOUT) 0.83 0.85 0.87 Buck to Buck-Boost (VIN/VOUT) 1.23 1.25 1.27 Buck-Boost to Buck (VIN/VOUT) 1.31 1.33 1.35 Peak-Buck to Peak-Boost (VIN/VOUT) 0.96 0.98 1.00 Peak-Boost to Peak-Buck (VIN/VOUT) 1.00 1.02 1.04 NMOS Drivers TG1, TG2 Gate Driver On-Resistance V(BST-SW) = 5V Gate Pull-Up 2.6 Ω Gate Pull-Down 1.4 Ω BG1, BG2 Gate Driver On-Resistance VINTVCC = 5V Gate Pull-Up 3.2 Ω Gate Pull-Down 1.2 Ω TG1, TG2 Rise Time CL = 3.3nF, 10% to 90% 25 ns TG1, TG2 Fall Time CL = 3.3nF, 90% to 10% 20 ns BG1, BG2 Rise Time CL = 3.3nF, 10% to 90% 25 ns BG1, BG2 Fall Time CL = 3.3nF, 90% to 10% 20 ns TG Off to BG On Delay CL = 3.3nF 25 ns BG Off to TG On Delay CL = 3.3nF 25 ns TG1 Minimum Duty Cycle in Buck Region Peak-Buck Current Mode 10 % TG1 Maximum Duty Cycle in Buck Region Peak-Buck Current Mode 90 % TG1 Fixed Duty Cycle in Buck-Boost Region Peak-Boost Current Mode 80 % BG2 Fixed Duty Cycle in Buck-Boost Region Peak-Buck Current Mode 20 % BG2 Minimum Duty Cycle in Boost Region Peak-Boost Current Mode 10 % BG2 Maximum Duty Cycle in Boost Region Peak-Boost Current Mode 90 % Note 1: Stresses beyond those listed under Absolute Maximum Ratings temperature range. The LT8390AH is guaranteed over the –40°C to 150°C may cause permanent damage to the device. Exposure to any Absolute operating junction temperature range. High junction temperatures degrade Maximum Rating condition for extended periods may affect device operating lifetimes. Operating lifetime is derated at junction temperatures reliability and lifetime. greater than 125°C. Note 2: The LT8390AE is guaranteed to meet performance specifications Note 3: The LT8390A includes overtemperature protection that is intended from 0°C to 125°C operating junction temperature. Specifications over to protect the device during momentary overload conditions. Junction the –40°C to 125°C operating junction temperature range are assured by temperature will exceed 150°C when overtemperature protection is active. design, characterization and correlation with statistical process controls. Continuous operation above the specified absolute maximum operating The LT8390AI is guaranteed over the –40°C to 125°C operating junction junction temperature may impair device reliability. 8390afa For more information www.linear.com/LT8390A 5 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings 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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