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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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LT3790 Arkusz danych(PDF) 5 Page - Linear Technology |
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LT3790 Arkusz danych(HTML) 5 Page - Linear Technology |
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5 / 30 page  LT8390A 5 8390afa For more information www.linear.com/LT8390A ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 12V, VEN/UVLO = 1.5V unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS Oscillator RT Pin Voltage RT = 100kΩ 1.00 V Switching Frequency VSYNC/SPRD = 0V, RT = 226kΩ VSYNC/SPRD = 0V, RT = 100kΩ VSYNC/SPRD = 0V, RT = 59.0kΩ l 645 1290 1900 685 1360 2000 725 1430 2100 kHz kHz 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 Gate Pull-Up Gate Pull-Down V(BST-SW) = 5V 2.6 1.4 Ω Ω BG1, BG2 Gate Driver On-Resistance Gate Pull-Up Gate Pull-Down VINTVCC = 5V 3.2 1.2 Ω Ω TG1, TG2 Rise Time TG1, TG2 Fall Time CL = 3.3nF, 10% to 90% CL = 3.3nF, 90% to 10% 25 20 ns ns BG1, BG2 Rise Time BG1, BG2 Fall Time CL = 3.3nF, 10% to 90% CL = 3.3nF, 90% to 10% 25 20 ns 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 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 LT8390AE is guaranteed to meet performance specifications from 0°C to 125°C operating 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 LT8390AI is guaranteed over the –40°C to 125°C operating junction temperature range. The LT8390AH is guaranteed over the –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 LT8390A includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature will exceed 150°C when overtemperature protection is active. Continuous operation above the specified absolute maximum operating junction temperature may impair device reliability. |
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