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LT1950IGN データシート(PDF) 2 Page - Linear Technology |
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LT1950IGN データシート(HTML) 2 Page - Linear Technology |
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2 / 20 page  LT1950 2 sn1950 1950fs ORDER PART NUMBER GN PART MARKING TJMAX = 125°C, θJA = 110°C/W, θJC (PIN 8) = 30°C/W 1950E 1950I LT1950EGN LT1950IGN ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. COMP = open, FB = 1.4V, ROSC = 249k, SYNC = 0V, SLOPE = open, VREF = 0.1 µF, SHDN = VIN, BLANK = 0V, ISENSE = 0V, VIN2 = 15V, GATE = 1nF, BOOST = open, VIN = 15V, VSEC = 0V, unless otherwise specified. Consult LTC Marketing for parts specified with wider operating temperature ranges. TOP VIEW GN PACKAGE 16-LEAD NARROW PLASTIC SSOP 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 COMP FB ROSC SYNC SLOPE VREF SHDN GND VSEC VIN BOOST PGND GATE VIN2 ISENSE BLANK PARAMETER CONDITIONS MIN TYP MAX UNITS PWM Controller Operating Input Voltage IVREF = 0µA q 3.0 25 V Minimum Start-Up Voltage IVREF = 0µA q 2.6 3.0 V VIN Quiescent Current IVREF = 0µA, FB = 1V, ISENSE = 0.2V 2.3 3.0 mA VIN Shutdown Current SHDN = 0V 5 20 µA Shutdown Threshold 3V < VIN < 25V q 1.261 1.32 1.379 V Shutdown Pin Current SHDN = 70mV Above Threshold –7 –10 –13 µA Shutdown Pin Current Hysteresis SHDN = 100mV Below Threshold 4 7 10 µA VIN2 Quiescent Current I(VREF) = 0µA, FB = 1V, ISENSE = 0.2V 1.7 2.5 mA VIN2 Shutdown Current SHDN = 0V, VIN2 = 2.7V (Boost Diode from VIN = 3V) 500 700 µA VREF (External Output) Output Voltage IVREF = 0µA q 2.425 2.500 2.575 V Line Regulation IVREF = 0µA, 3V < VIN < 25V 1 5 mV Load Regulation 0 µA < IVREF < 2.5mA 1 5 mV Oscillator Frequency: fOSC ROSC = 249k, FB = 1V q 170 200 230 kHz Minimum Programmable fOSC ROSC = 499k 85 100 115 kHz Maximum Programmable fOSC ROSC = 90.9k 440 500 560 kHz SYNC Input Resistance 20 k Ω SYNC Switching Threshold 1.5 2.2 V SYNC Frequency/fOSC (ROSC = 249k, fOSC =200kHz), FB = 1V (Note 7) 1.25 1.5 fOSC Line Reg 3V < VIN < 25V 0.05 0.15 %/V 9.5V < VIN2 < 25V 0.05 0.25 %/V VROSC 1V BOOST ....................................................... –0.3V to 35V VIN, VIN2, SHDN ......................................... –0.3V to 25V FB, SYNC, VSEC ........................................... –0.3V to 6V COMP, BLANK .......................................... –0.3V to 3.5V SLOPE ...................................................... –0.3V to 2.5V ISENSE ......................................................... –0.3V to 1V ROSC .................................................................... –50µA VREF .................................................................... –10mA Operating Junction Temperature Range LT1950EGN/LT1950IGN (Notes 2, 5) ... – 40 °C to 125°C Storage Temperature Range ..................–65 °C to 150°C Lead Temperature (Soldering, 10 sec).................. 300 °C |
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