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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LTC3718EG датащи(PDF) 2 Page - Linear Technology |
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LTC3718EG датащи(HTML) 2 Page - Linear Technology |
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2 / 20 page  2 LTC3718 3718fa (Note 1) Input Supply Voltage (VIN2) .......................10V to –0.3V Boosted Topside Driver Supply Voltage (BOOST) ............................................... 42V to – 0.3V VIN1, ION, SW1 Voltage ............................. 36V to –0.3V RUN/SS, PGOOD Voltages ......................... 7V to – 0.3V VON, VREF, VRNG Voltages .......(INTVCC + 0.3V) to –0.3V ITH, VFB1 Voltages .................................... 2.7V to –0.3V SW2 Voltage ............................................. 36V to – 0.4V VFB2 Voltage ................................................. VIN2 + 0.3V SHDN Voltage ......................................................... 10V TG, BG, INTVCC Peak Currents.................................. 2A TG, BG, INTVCC RMS Currents ............................ 50mA Operating Ambient Temperature Range (Note 4) ................................... – 40 °C to 85°C Junction Temperature (Note 2) ............................ 125 °C Storage Temperature Range ................. – 65 °C to 150°C Lead Temperature (Soldering, 10 sec).................. 300 °C ORDER PART NUMBER LTC3718EG TJMAX = 125°C, θJA = 130°C/ W The q denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. VIN1 = 15V, VIN2 = 1.5V unless otherwise noted. ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO ELECTRICAL CHARACTERISTICS 1 2 3 4 5 6 7 8 9 10 11 12 TOP VIEW G PACKAGE 24-LEAD PLASTIC SSOP 24 23 22 21 20 19 18 17 16 15 14 13 RUN/SS VON PGOOD VRNG ITH SGND1 ION VFB1 VREF SHDN SGND2 VFB2 BOOST TG SW1 SENSE+ SENSE– PGND1 BG INTVCC VIN1 VIN2 PGND2 SW2 Consult LTC Marketing for parts specified with wider operating temperature ranges. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Buck Regulator IQ(VIN1) Input DC Supply Current (VIN1) Normal 1000 2000 µA Shutdown Supply Current VRUN/SS = 0V 15 30 µA VFB1 Feedback Voltage Accuracy ITH = 1.2V (Note 3) q – 0.65 0.1 0.65 % ∆VFB1(LINE) Feedback Voltage Line Regulation VIN1 = 4V to 36V, ITH = 1.2V (Note 3) 0.002 %/V ∆VFB1(LOAD) Feedback Voltage Load Regulation ITH = 0.5V to 1.9V (Note 3) q – 0.05 – 0.3 % gm(EA) Error Amplifier Transconductance ITH = 1.2V (Note 3) 0.93 1.13 1.33 mS tON On-Time ION = 60µA, VON = 1.5V 200 250 300 ns ION = 30µA, VON = 1.5V 400 500 600 ns tON(MIN) Minimum On-Time ION = 180µA 50 100 ns tOFF(MIN) Minimum Off-Time 300 400 ns VSENSE(MAX) Maximum Current Sense Threshold VRNG = 1V, VFB1 = VREF/2 – 50mV q 108 135 162 mV VPGND – VSW1 (Source) VRNG = 0V, VFB1 = VREF/2 – 50mV q 76 95 114 mV VRNG = INTVCC, VFB1 = VREF/2 – 50mV q 148 185 222 mV VSENSE(MIN) Minimum Current Sense Threshold VRNG = 1V, VFB1 = VREF/2 + 50mV –140 –165 –190 mV VPGND – VSW1 (Sink) VRNG = 0V, VFB1 = VREF/2 + 50mV –97 –115 –133 mV VRNG = INTVCC, VFB1 = VREF/2 + 50mV – 200 – 235 – 270 mV ∆VFB1(OV) Output Overvoltage Fault Threshold 8 10 12 % ∆VFB1(UV) Output Undervoltage Fault Threshold – 25 % VRUN/SS(ON) RUN Pin Start Threshold q 0.8 1.5 2 V VRUN/SS(LE) RUN Pin Latchoff Enable RUN/SS Pin Rising 4 4.5 V |
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