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LT3478-1 Datasheet(PDF) 2 Page - Linear Technology |
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LT3478-1 Datasheet(HTML) 2 Page - Linear Technology |
2 / 24 page LT3478/LT3478-1 2 34781f SW ............................................................................42V VOUT, LED..................................................................42V VIN, VS, VL, ⎯S⎯H⎯D⎯N (Note 5) .......................................36V PWM.........................................................................15V CTRL1, 2.....................................................................6V SS, RT, VC, VREF, OVPSET............................................2V Operating Junction Temperature Range (Notes 2, 3, 4).................................... –40°C to 125°C Storage Temperature Range................... –65°C to 150°C Lead Temperature (Soldering, 10 Sec).................. 300°C (Note 1) The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. SW = open, VIN = VS = L = VOUT = ⎯S⎯H⎯D⎯N = 2.7V, LED = open, SS = open, PWM = CTRL1, CTRL2 = 1.25V, VREF = open, VC = open, RT = 31.6k. ELECTRICAL CHARACTERISTICS ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO FE PACKAGE 16-LEAD PLASTIC TSSOP 1 2 3 4 5 6 7 8 TOP VIEW 16 15 14 13 12 11 10 9 17 SW SW VIN VS L VOUT LED OVPSET SS RT PWM CTRL2 CTRL1 SHDN VREF VC TJMAX = 125°C, θJA = 35°C/W EXPOSED PAD (PIN 17) IS PGND, MUST BE SOLDERED TO PCB. ORDER PART NUMBER FE PART MARKING LT3478EFE LT3478EFE-1 LT3478IFE LT3478IFE-1 3478FE 3478FE-1 3478FE 3478FE-1 Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: http://www.linear.com/leadfree/ Consult LTC Marketing for parts specified with wider operating temperature ranges. PARAMETER CONDITIONS MIN TYP MAX UNITS Minimum Operating Voltage (Rising) ● 2.4 2.8 V Operational Input Voltage VS VIN (Note 5) 2.8 2.8 36 36 V V VIN Quiescent Current VC = 0V (No Switching) 6.1 mA VIN Shutdown Current ⎯S⎯H⎯D⎯N = 0V 3 6 µA ⎯S⎯H⎯D⎯N Pin Threshold (VSD_µp) (Micropower) ● 0.1 0.4 0.7 V ⎯S⎯H⎯D⎯N Pin Threshold (VSD_UVLO) (Switching) 1.3 1.4 1.5 V ⎯S⎯H⎯D⎯N Pin Current ⎯S⎯H⎯D⎯N = VSD_UVLO – 50mV ⎯S⎯H⎯D⎯N = VSD_UVLO + 50mV 810 0 12 µA µA VREF Voltage I(VREF) = 0µA, VC = 0V ● 1.213 1.240 1.263 V VREF Line Regulation I(VREF) = 0µA, 2.7V < VIN < 36V 0.005 0.015 %/V VREF Load Regulation 0 < I(VREF) < 100µA (Max) 8 12 mV Frequency: fOSC 200kHz RT = 200k 0.18 0.2 0.22 MHz Frequency: fOSC 1MHz RT = 31.6k ● 0.88 1.12 MHz |
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