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LT3431 Datasheet(PDF) 2 Page - Linear Technology |
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LT3431 Datasheet(HTML) 2 Page - Linear Technology |
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2 / 28 page  2 LT3431 sn3431 3431fs (Note 1) Input Voltage (VIN) ................................................. 60V BOOST Pin Above SW ............................................ 35V BOOST Pin Voltage ................................................. 68V SYNC Voltage ........................................................... 7V SHDN Voltage ........................................................... 6V BIAS Pin Voltage .................................................... 30V FB Pin Voltage/Current .................................. 3.5V/2mA Operating Junction Temperature Range LT3431EFE (Notes 8, 10) ................. – 40 °C to 125°C LT3431IFE (Notes 8, 10) ................. – 40 °C to 125°C Storage Temperature Range ................ – 65 °C to 150°C Lead Temperature (Soldering, 10 sec)................. 300 °C ORDER PART NUMBER LT3431EFE LT3431IFE FE PART MARKING PARAMETER CONDITIONS MIN TYP MAX UNITS Reference Voltage (VREF) 5.5V ≤ VIN ≤ 60V 1.204 1.219 1.234 V VOL + 0.2 ≤ VC ≤ VOH – 0.2 q 1.195 1.243 V FB Input Bias Current q –0.2 –1.5 µA Error Amp Voltage Gain (Note 2) 200 475 V/V Error Amp gm dl (VC) = ±10µA 1650 2200 3300 µMho q 1000 4200 µMho VC to Switch gm 3.4 A/V EA Source Current FB = 1V or VSENSE = 4.1V q 125 275 450 µA EA Sink Current FB = 1.4V or VSENSE = 5.7V q 100 275 500 µA VC Switching Threshold Duty Cycle = 0 0.8 V VC High Clamp SHDN = 1V 2.1 V Switch Current Limit VC Open, BOOST = VIN + 5V, FB = 1V or VSENSE = 4.1V –40 °C ≤ Tj ≤ 25°C 3.0 5 6.5 A (Note 9) Tj = 125 °C 2.5 4 5.5 A Switch On Resistance ISW = 2.5A, BOOST = VIN + 5V (Note 7) 0.1 0.14 Ω q 0.18 Ω Maximum Switch Duty Cycle FB = 1V or VSENSE = 4.1V 88 92 % q 80 % Switch Frequency VC Set to Give DC = 50% 460 500 540 kHz q 430 500 570 kHz fSW Line Regulation 5.5V ≤ VIN ≤ 60V q 0.05 0.15 %/V fSW Shifting Threshold Df = 10kHz 0.8 V The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TJ = 25°C. VIN = 15V, VC = 1.5V, SHDN = 1V, BOOST open circuit, SW open circuit, unless otherwise noted. TJMAX = 125°C, θJA = 45°C/ W, θJC (PAD) = 10°C/W EXPOSED PAD MUST BE SOLDERED TO GROUND PLANE ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO ELECTRICAL CHARACTERISTICS FE PACKAGE 16-LEAD PLASTIC TSSOP 1 2 3 4 5 6 7 8 TOP VIEW 16 15 14 13 12 11 10 9 GND SW VIN VIN SW BOOST NC GND GND SHDN SYNC NC FB VC BIAS GND Consult LTC Marketing for parts specified with wider operating temperature ranges. 3431EFE 3431IFE |
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