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LT8705 Datasheet(PDF) 3 Page - Linear Technology |
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LT8705 Datasheet(HTML) 3 Page - Linear Technology |
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3 / 24 page  LT3840 3 3840fa For more information www.linear.com/LT3840 elecTrical characTerisTics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. PARAMETER CONDITIONS MIN TYP MAX UNITS Input Supply VIN Minimum Operating Voltage VIN Supply Current VIN Burst Mode Current VIN Shutdown Current VMODE = 0V VEN = 0.3V l l 20 20 0.1 2.5 30 1 V µA µA µA AUXVIN Minimum Operating Voltage AUXVIN Overvoltage Lockout AUXVIN Supply Current AUXVIN Burst Mode Current AUXVIN Shutdown Current (Note 3) VMODE = 0V VEN = 0.3V l l 60 300 0.1 0.1 2.5 1 V V µA µA µA EN Enable Threshold (Rising) EN Hysteresis EN Pin Bias Current VEN = 1.25V l 1.20 1.25 30 2 1.30 V mV nA UVLO Enable Threshold (Rising) UVLO Hysteresis UVLO Pin Bias Current VUVLO = 1.25V l 1.20 1.25 45 1 1.30 V mV nA OVLO Threshold (Rising) OVLO Hysteresis OVLO Pin Bias Current VOVLO = 1.25V l 1.20 1.25 125 1 1.30 V mV nA Voltage Regulation Regulated FB Voltage E- and I-Grade l 1.237 1.250 1.263 V Regulated FB Voltage MP- and H-Grade l 1.232 1.250 1.263 V FB Overvoltage Protection % Above FB Voltage l 8 12 16 % FB Overvoltage Protection Hysteresis 2.5 % FB Input Bias Current 5 20 nA FB Voltage Line Regulation 2.5V ≤ VIN ≤ 60V 0.002 0.02 %/V FB Error Amp Transconductance 300 µS FB Error Amp Sink/Source Current ±25 µA Peak Current Limit Sense Voltage 0% Duty Cycle 80 95 110 mV Peak Current Limit Sense Voltage 100% Duty Cycle 60 mV TK/SS Charge Current 9 µA Current Regulation Sense Common Mode Range l 0 60 V Average Current Limit Sense Voltage VICTRL = Open VICTRL = 800mV l 47.5 50 40 52.5 mV mV IMON Voltage VSENSE = 50mV VSENSE = 20mV l 0.95 1.00 0.4 1.05 V V ICTRL Current VICTRL = 1V 7 µA Reverse Protect Sense Voltage VMODE = 7.5V –50 mV Reverse Current Sense Voltage Offset VMODE = VFB or VMODE = 0V 5 mV Sense Input Current SENSE+ = SENSE– = 12V 300 µA Oscillator Switching Frequency RT = 49.9k RT = 348k RT = 13.7k l 280 300 50 1000 320 kHz kHz kHz SYNC Threshold 1.2 V |
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