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LT3579EUFD-TRPBF Datasheet(PDF) 3 Page - Linear Technology |
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LT3579EUFD-TRPBF Datasheet(HTML) 3 Page - Linear Technology |
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3 / 40 page  LT3579/LT3579-1 3 35791f ELECTRICAL CHARACTERISTICS PARAMETER CONDITIONS MIN TYP MAX UNITS Minimum Input Voltage l 2.3 2.5 V VIN Overvoltage Lockout 16.2 18.7 21.2 V Positive Feedback Voltage l 1.195 1.215 1.230 V Negative Feedback Voltage l 39 16 mV Positive FB Pin Bias Current VFB=Positive Feedback Voltage, Current into Pin l 80.5 83.3 85 μA Negative FB Pin Bias Current VFB=Negative Feedback Voltage, Current out of Pin l 81 83.3 85.5 μA Error Amp Transconductance ΔI=10μA 250 μmhos Error Amp Voltage Gain 70 V/V Quiescent Current Not Switching 1.9 2.4 mA Quiescent Current in Shutdown VSHDN = 0V 0 1 μA Reference Line Regulation 2.5V ≤ VIN ≤ 15V 0.01 0.05 %/V Switching Frequency, fOSC RT = 34kΩ l 2.2 2.5 2.8 MHz RT = 432kΩ l 175 200 225 kHz Switching Frequency in Foldback Compared to Normal fOSC 1/6 ratio Switching Frequency Range Free-Running or Synchronizing l 200 2500 kHz SYNC High Level for Sync l 1.3 V SYNC Low Level for Sync l 0.4 V SYNC Clock Pulse Duty Cycle VSYNC = 0V to 2V 20 80 % Recommended Minimum SYNC Ratio fSYNC/fOSC 3/4 Minimum Off-Time 45 nS Minimum On-Time 55 nS SW1 Current Limit At All Duty Cycles (Note 3) l 3.4 4.2 5.1 A SW Current Sharing, ISW2/ISW1 SW1 and SW2 Tied Together 0.78 A/A SW1 + SW2 Current Limit ISW2/ISW1 = 0.78, At All Duty Cycles (Note 3) l 6 7.5 9.4 A Switch VCESAT SW1 and SW2 Tied Together, ISW1 + ISW2 = 5.5A 250 350 mV SW1 Leakage Current VSW1 = 5V 0.01 1 μA SW2 Leakage Current VSW2 = 5V 0.01 1 μA The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 5V, VSHDN = VIN, VFAULT = VIN unless otherwise noted. (Note 2). |
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