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LT3758 Datasheet(PDF) 4 Page - Analog Devices |
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LT3758 Datasheet(HTML) 4 Page - Analog Devices |
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4 / 28 page  LT8392 4 Rev. 0 For more information www.analog.com PARAMETER CONDITIONS MIN TYP MAX UNITS FB Load Regulation 0.2 0.8 % FB Voltage Regulation Amplifier gm 660 µs FB Input Bias Current FB in regulation, Current out of Pin 20 40 nA VC Output Impedance 10 MΩ Current Comparator Maximum Current Sense Threshold V(LSP-LSN) Buck, VFB = 0.8V Boost, VFB = 0.8V l l 35 40 50 50 65 60 mV mV Fault FB Short Threshold (VFB) Falling 0.23 0.25 0.27 V FB Short Hysteresis 35 50 65 mV PGOOD Upper Threshold Offset from VFB Rising 6 8 10 % PGOOD Lower Threshold Offset from VFB Falling –10 –8 –6 % PGOOD Pull-Down Resistance 100 200 Ω SS Hard Pull-Down Resistance VEN/UVLO = 1.1V 100 200 Ω SS Pull-Up Current VSS = 0V 10 12.5 15 µA SS Pull-Down Current VSS = 2V 1 1.25 1.5 µA SS Fault Latch-Off Threshold 1.7 V SS Fault Reset Threshold 0.2 V Oscillator Switching Frequency VSYNC/SPRD = 0V, RT = 100kΩ l 380 400 420 kHz SYNC Frequency 150 650 kHz SYNC/SPRD Threshold Voltage 0.4 1.5 V Highest Spread Spectrum Above Oscillator Frequency VSYNC/SPRD = 5V 12 15 18 % Lowest Spread Spectrum Below Oscillator Frequency VSYNC/SPRD = 5V –18 –15 –12 % 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 TG Off to BG On Delay 60 ns BG Off to TG On Delay 60 ns 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. 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 LT8392E 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 LT8392J is guaranteed over the –40°C to 150°C operating junction temperature range. The LT8392H 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 LT8392 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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