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LT3581IMSE-TRPBF Datasheet(PDF) 3 Page - Linear Technology |
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LT3581IMSE-TRPBF Datasheet(HTML) 3 Page - Linear Technology |
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3 / 36 page  LT3581 3581f elecTrical characTerisTics PARAMETER CONDITIONS MIN TYP MAX UNITS Minimum Input Voltage l 2.3 2.5 V VIN Overvoltage Lockout 22.1 23.5 25 V Positive Feedback Voltage l 1.195 1.215 1.230 V Negative Feedback Voltage l 3 9 16 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 l 81 83.3 85.5 µA Error Amp Transconductance ΔI = 10μA 270 µmhos Error Amp Voltage Gain 70 V/V Quiescent Current Not Switching 1.9 2.3 mA Quiescent Current in Shutdown VSHDN = 0V 0 1 µA Reference Line Regulation 2.5V ≤ VIN ≤ 20V 0.01 0.05 %/V Switching Frequency, fOSC RT = 34k l 2.25 2.5 2.75 MHz RT = 432k l 180 200 220 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 Synchronization l 1.3 V SYNC Low Level for Synchronization 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 l 1.9 2.4 3 A Current Sharing (SW2/SW1) 78 % SW1 + SW2 Current Limit At All Duty Cycles, SW2/SW1 = 78% (Note 3) l 3.3 4.3 5.4 A Switch VCESAT SW1 & SW2 Tied Together, ISW1 + ISW2 = 2.75A 250 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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