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LT1931 Datasheet(PDF) 3 Page - Linear Technology |
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LT1931 Datasheet(HTML) 3 Page - Linear Technology |
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3 / 28 page  LT3580 3 3580fg 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 LT3580E is 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 LT3580I is guaranteed over the full –40°C to 125°C operating junction temperature range. The LT3580H is guaranteed over the full –40°C to ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 5V, VSHDN = VIN unless otherwise noted. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS Operating Voltage Range l 2.5 32 V Positive Feedback Voltage l 1.195 1.215 1.230 V Negative Feedback Voltage l 0 5 12 mV Positive FB Pin Bias Current VFB = Positive Feedback Voltage, Current Into Pin l 81 83.3 85 μA Negative FB Pin Bias Current VFB = Negative Feedback Voltage, Current Out of Pin (LT3580E, LT3580I, LT3580MP) (LT3580H) l l 81 81 83.3 83.3 85.5 86 μA μA Error Amplifier Transconductance 230 μmhos Error Amplifier Voltage Gain 70 V/V Quiescent Current VSHDN = 2.5V, Not Switching 1 1.5 mA Quiescent Current in Shutdown VSHDN = 0V 0 1 μA Reference Line Regulation 2.5V ≤ VIN ≤ 32V 0.01 0.05 %/V Switching Frequency, fOSC RT = 45.3k (LT3580E, LT3580I, LT3580H) RT = 45.3k (LT3580MP) RT = 464k (LT3580E, LT3580I, LT3580H) RT = 464k (LT3580MP) l l l l 1.8 1.8 180 180 2 2 200 200 2.2 2.25 220 225 MHz MHz kHz kHz Switching Frequency in Foldback Compared to Normal fOSC 1/4 Ratio Switching Frequency Set Range SYNCing or Free Running l 200 2500 kHz SYNC High Level for Synchronization l 1.3 V SYNC Low Level for Synchronization l 0.4 V SYNC Clock Pulse Duty Cycle VSYNC = 0V to 2V 35 65 % Recommended Minimum SYNC Ratio fSYNC/fOSC 3/4 Minimum Off-Time 60 ns Minimum On-Time 100 ns Switch Current Limit Minimum Duty Cycle (Note3) (LT3580E, LT3580I, LT3580H) Minimum Duty Cycle (Note3) (LT3580MP) Maximum Duty Cycle (Notes 3, 4) (LT3580E, LT3580I, LT3580MP) Maximum Duty Cycle (Notes 3, 4) (LT3580H) l l l l 2.2 2.15 1.6 1.55 2.5 2.2 1.9 1.9 2.8 2.8 2.6 2.6 A A A A Switch VCESAT ISW = 1.5A 300 mV Switch Leakage Current VSW = 5V 0.01 1 μA Soft-Start Charging Current VSS = 0.5V l 468 μA SHDN Minimum Input Voltage High Active Mode, SHDN Rising (LT3580E, LT3580I) Active Mode, SHDN Rising (LT3580H, LT3580MP) Active Mode, SHDN Falling (LT3580E, LT3580I) Active Mode, SHDN Falling (LT3580H, LT3580MP) l l l l 1.27 1.25 1.24 1.22 1.32 1.32 1.29 1.29 1.38 1.4 1.33 1.35 V V V V SHDN Input Voltage Low Shutdown Mode l 0.3 V SHDN Pin Bias Current VSHDN = 3V VSHDN = 1.3V VSHDN = 0V 9.7 40 11.6 0 60 13.4 0.1 μA μA μA 150°C operating junction temperature range. The LT3580MP is guaranteed over the full –55°C to 125°C operating junction temperature range. Operating lifetime is derated at junction temperatures greater than 125°C. Note 3: Current limit guaranteed by design and/or correlation to static test. Note 4: Current limit measured at equivalent switching frequency of 2.5MHz. Note 5: This IC 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 maximum operating junction temperature may impair device reliability. |
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Similar Description - LT1931 |
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