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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LTC1709-8 датащи(PDF) 2 Page - Linear Technology |
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LTC1709-8 датащи(HTML) 2 Page - Linear Technology |
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2 / 24 page  2 LTC1778/LTC1778-1 1778fb Input Supply Voltage (VIN, ION)................. 36V to –0.3V Boosted Topside Driver Supply Voltage (BOOST) ................................................... 42V to – 0.3V SW Voltage .................................................. 36V to – 5V EXTVCC, (BOOST – SW), RUN/SS, PGOOD Voltages ....................................... 7V to – 0.3V FCB, VON, VRNG Voltages .......... INTVCC + 0.3V to –0.3V ITH, VFB Voltages...................................... 2.7V to –0.3V ORDER PART NUMBER LTC1778EGN LTC1778IGN TJMAX = 125°C, θJA = 130°C/ W ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO GN PART MARKING 1778 1778I TG, BG, INTVCC, EXTVCC Peak Currents.................... 2A TG, BG, INTVCC, EXTVCC RMS Currents .............. 50mA Operating Ambient Temperature Range (Note 4) LTC1778E ........................................... – 40°C to 85°C LTC1778I .......................................... – 40°C to 125°C Junction Temperature (Note 2) ............................ 125°C Storage Temperature Range ................. – 65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C TOP VIEW GN PACKAGE 16-LEAD PLASTIC SSOP 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 RUN/SS PGOOD VRNG FCB ITH SGND ION VFB BOOST TG SW PGND BG INTVCC VIN EXTVCC ORDER PART NUMBER LTC1778EGN-1 GN PART MARKING 17781 TOP VIEW GN PACKAGE 16-LEAD PLASTIC SSOP 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 RUN/SS VON VRNG FCB ITH SGND ION VFB BOOST TG SW PGND BG INTVCC VIN EXTVCC The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. VIN = 15V unless otherwise noted. ELECTRICAL CHARACTERISTICS 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 3) LTC1778E ● 0.792 0.800 0.808 V ITH = 1.2V (Note 3) LTC1778I ● 0.792 0.800 0.812 V ∆VFB(LINEREG) Feedback Voltage Line Regulation VIN = 4V to 30V, ITH = 1.2V (Note 3) 0.002 %/V ∆VFB(LOADREG) Feedback Voltage Load Regulation ITH = 0.5V to 1.9V (Note 3) ● – 0.05 – 0.3 % IFB Feedback Input Current VFB = 0.8V –5 ±50 nA gm(EA) Error Amplifier Transconductance ITH = 1.2V (Note 3) ● 1.4 1.7 2 mS VFCB Forced Continuous Threshold ● 0.76 0.8 0.84 V IFCB Forced Continuous Pin Current VFCB = 0.8V – 1 – 2 µA tON On-Time ION = 30µA, VON = 0V (LTC1778-1) 198 233 268 ns ION = 15µA, VON = 0V (LTC1778-1) 396 466 536 ns tON(MIN) Minimum On-Time ION = 180µA 50 100 ns TJMAX = 125°C, θJA = 130°C/ W Consult LTC Marketing for parts specified with wider operating temperature ranges. (Note 1) |
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