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LTC3855EFEPBF Datasheet(PDF) 3 Page - Linear Technology |
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LTC3855EFEPBF Datasheet(HTML) 3 Page - Linear Technology |
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3 / 44 page  LTC3855 3855f orDer inForMaTion LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3855EFE#PBF LTC3855EFE#TRPBF LTC3855FE 38-Lead Plastic TSSOP –40°C to 85°C LTC3855IFE#PBF LTC3855IFE#TRPBF LTC3855FE 38-Lead Plastic TSSOP –40°C to 125°C LTC3855EUJ#PBF LTC3855EUJ#TRPBF LTC3855UJ 40-Lead (6mm × 6mm) Plastic QFN –40°C to 85°C LTC3855IUJ#PBF LTC3855IUJ#TRPBF LTC3855UJ 40-Lead (6mm × 6mm) Plastic QFN –40°C to 125°C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loops VIN Input Voltage Range 4.5 38 V VOUT Output Voltage Range 0.6 12.5 V VFB1,2 Regulated Feedback Voltage ITH1,2 Voltage = 1.2V (Note 4) ITH1,2 Voltage = 1.2V (Note 4), TA = 125°C l l 0.5955 0.594 0.600 0.600 0.6045 0.606 V V IFB1,2 Feedback Current (Note 4) –15 –50 nA VREFLNREG Reference Voltage Line Regulation VIN = 4.5V to 38V (Note 4) 0.002 0.02 %/V VLOADREG Output Voltage Load Regulation (Note 4) Measured in Servo Loop; ∆ITH Voltage = 1.2V to 0.7V Measured in Servo Loop; ∆ITH Voltage = 1.2V to 1.6V l l 0.01 –0.01 0.1 –0.1 % % gm1,2 Transconductance Amplifier gm ITH1,2 = 1.2V; Sink/Source 5µA; (Note 4) 2 mmho IQ Input DC Supply Current Normal Mode Shutdown (Note 5) VIN = 15V VRUN1,2 = 0V 3.5 30 50 mA µA DFMAX Maximum Duty Factor In Dropout, fOSC = 500kHz 94 95 % UVLO Undervoltage Lockout VINTVCC Ramping Down l 3.0 3.2 3.4 V UVLOHYS UVLO Hysteresis 0.6 V VOVL1,2 Feedback Overvoltage Lockout Measured at VFB1,2 l 0.64 0.66 0.68 V ISENSE1,2 Sense Pins Bias Current (Each Channel); VSENSE1,2 = 3.3V l ±1 ±2 µA ITEMP1,2 DCR Tempco Compensation Current VITEMP1,2 = 0.2V l 9 10 11 µA ITK/SS1,2 Soft-Start Charge Current VTK/SS1,2 = 0V l 1 1.2 1.4 µA VRUN1,2 RUN Pin ON Threshold VRUN1, VRUN2 Rising l 1.1 1.22 1.35 V VRUN1,2HYS RUN Pin ON Hysteresis 80 mV VSENSE(MAX) Maximum Current Sense Threshold VFB1,2 = 0.5V, VSENSE1,2 = 3.3V, ILIM = 0V VFB1,2 = 0.5V, VSENSE1,2 = 3.3V, ILIM = Float VFB1,2 = 0.5V, VSENSE1,2 = 3.3V, ILIM = INTVCC l l l 25 45 68 30 50 75 35 55 82 mV mV mV TG1, 2 tr TG1, 2 tf TG Transition Time: Rise Time Fall Time (Note 6) CLOAD = 3300pF CLOAD = 3300pF 25 25 ns ns BG1, 2 tr BG1, 2 tf BG Transition Time: Rise Time Fall Time (Note 6) CLOAD = 3300pF CLOAD = 3300pF 25 25 ns ns elecTrical characTerisTics The l denotes the specifications which apply over the full operating junction temperature range (E-Grade), otherwise specifications are at TA = 25°C. VIN = 15V, VRUN1,2 = 5V unless otherwise noted. |
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