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LTC3720 Datasheet(PDF) 2 Page - Linear Technology |
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LTC3720 Datasheet(HTML) 2 Page - Linear Technology |
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2 / 24 page  2 LTC3720 3720f (Note 1) Input Supply Voltage VIN, ION ..................................................36V to –0.3V Boosted Topside Driver Supply Voltage BOOST .................................................. 42V to – 0.3V SW, SENSE+ Voltages ................................. 36V to – 5V EXTVCC, (BOOST – SW), RUN/SS, VCC VID0-VID4, PGOOD Voltages ..................... 7V to – 0.3V FCB, VON, VRNG Voltages .......... INTVCC + 0.3V to –0.3V ITH, VFB, VOSENSE Voltages ....................... 2.7V to –0.3V TG, BG, INTVCC, EXTVCC Peak Currents .................... 2A TG, BG, INTVCC, EXTVCC RMS Currents .............. 50mA Operating Ambient Temperature Range LTC3720EGN (Note 2) ........................ – 40 °C to 85°C Junction Temperature (Note 3) ............................ 125 °C Storage Temperature Range ................. – 65 °C to 150°C Lead Temperature (Soldering, 10 sec).................. 300 °C ORDER PART NUMBER LTC3720EGN TJMAX = 125°C, θJA = 95°C/ W The q denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. VIN = 15V unless otherwise noted. ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO ELECTRICAL CHARACTERISTICS Consult LTC Marketing for parts specified with wider operating temperature ranges. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 TOP VIEW GN PACKAGE 28-LEAD NARROW PLASTIC SSOP 28 27 26 25 24 23 22 21 20 19 18 17 16 15 RUN/SS VON PGOOD VRNG FCB ITH SGND ION VFB SGND VFB VOSENSE VID0 VID1 BOOST TG SW SENSE+ SENSE– PGND BG INTVCC VIN EXTVCC VCC VID4 VID3 VID2 SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loop IQ Input DC Supply Current Normal 900 2000 µA Shutdown Supply Current 15 30 µA VFB Feedback Reference Voltage ITH = 1.2V (Note 4) q 0.792 0.800 0.808 V ∆VFB(LINEREG) Feedback Voltage Line Regulation VIN = 4V to 30V, ITH = 1.2V (Note 4) 0.002 %/V ∆VFB(LOADREG) Feedback Voltage Load Regulation ITH = 0.5V to 1.9V (Note 4) q – 0.05 – 0.3 % IFB Feedback Pin Input Current –5 ±50 nA gm(EA) Error Amplifier Transconductance ITH = 1.2V (Note 4) 1.4 1.7 2 mS VFCB Forced Continuous Threshold q 0.76 0.8 0.84 V IFCB Forced Continuous Pin Current VFCB = 0.8V – 1 – 2 µA tON On-Time ION = 60µA, VON = 1.5V 200 250 300 ns ION = 30µA, VON = 1.5V 425 500 575 ns tON(MIN) Minimum On-Time ION = 180µA, VON = 0V 50 100 ns tOFF(MIN) Minimum Off-Time ION = 60µA, VON = 1.5V 250 400 ns VSENSE(MAX) Maximum Current Sense Threshold VRNG = 1V, VFB = 0.76V q 113 133 153 mV VSENSE– – VSENSE+ VRNG = 0V, VFB = 0.76V q 79 93 107 mV VRNG = INTVCC, VFB = 0.76V q 158 186 214 mV VSENSE(MIN) Minimum Current Sense Threshold VRNG = 1V, VFB = 0.84V – 67 mV VSENSE– – VSENSE+ VRNG = 0V, VFB = 0.84V – 47 mV VRNG = INTVCC, VFB = 0.84V – 93 mV ∆VFB(OV) Output Overvoltage Fault Threshold 5.5 7.5 9.5 % VFB(UV) Output Undervoltage Fault Threshold 520 600 680 mV VRUN/SS(ON) RUN Pin Start Threshold q 0.8 1.5 2 V |
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