Datasheet LTC1778, LTC1778-1 (Analog Devices) - 2
| Fabricante | Analog Devices |
| Descripción | Wide Operating Range, No RSENSE Step-Down Controller |
| Páginas / Página | 24 / 2 — ABSOLUTE AXI U RATI GS (Note 1). PACKAGE/ORDER I FOR ATIO. ELECTRICAL … |
| Revisión | B |
| Formato / tamaño de archivo | PDF / 273 Kb |
| Idioma del documento | Inglés |
ABSOLUTE AXI U RATI GS (Note 1). PACKAGE/ORDER I FOR ATIO. ELECTRICAL CHARACTERISTICS The
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LTC1778/LTC1778-1
W W W U ABSOLUTE AXI U RATI GS (Note 1)
Input Supply Voltage (VIN, ION)... 36V to –0.3V TG, BG, INTVCC, EXTVCC Peak Currents.. 2A Boosted Topside Driver Supply Voltage TG, BG, INTVCC, EXTVCC RMS Currents .. 50mA (BOOST) ... 42V to – 0.3V Operating Ambient Temperature Range (Note 4) SW Voltage .. 36V to – 5V LTC1778E ... – 40°C to 85°C EXTVCC, (BOOST – SW), RUN/SS, LTC1778I .. – 40°C to 125°C PGOOD Voltages ... 7V to – 0.3V Junction Temperature (Note 2) .. 125°C FCB, VON, VRNG Voltages .. INTVCC + 0.3V to –0.3V Storage Temperature Range ... – 65°C to 150°C ITH, VFB Voltages.. 2.7V to –0.3V Lead Temperature (Soldering, 10 sec).. 300°C
U W U PACKAGE/ORDER I FOR ATIO
TOP VIEW ORDER PART TOP VIEW ORDER PART RUN/SS 1 16 BOOST NUMBER RUN/SS 1 16 BOOST NUMBER PGOOD 2 15 TG V 2 15 ON TG LTC1778EGN LTC1778EGN-1 V 3 14 RNG SW V 3 14 RNG SW LTC1778IGN FCB 4 13 PGND FCB 4 13 PGND I 5 12 TH BG I 5 12 TH BG SGND 6 11 INTVCC SGND 6 11 INTVCC I 7 10 V GN PART MARKING I 7 10 V GN PART MARKING ON IN ON IN V 8 9 FB EXTVCC V 8 9 1778 FB EXTVCC 17781 GN PACKAGE 1778I GN PACKAGE 16-LEAD PLASTIC SSOP 16-LEAD PLASTIC SSOP TJMAX = 125°C, θJA = 130°C/ W TJMAX = 125°C, θJA = 130°C/ W Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The
●
denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25
°
C. VIN = 15V unless otherwise noted. 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 1778fb 2
W W W U ABSOLUTE AXI U RATI GS (Note 1)
Input Supply Voltage (VIN, ION)... 36V to –0.3V TG, BG, INTVCC, EXTVCC Peak Currents.. 2A Boosted Topside Driver Supply Voltage TG, BG, INTVCC, EXTVCC RMS Currents .. 50mA (BOOST) ... 42V to – 0.3V Operating Ambient Temperature Range (Note 4) SW Voltage .. 36V to – 5V LTC1778E ... – 40°C to 85°C EXTVCC, (BOOST – SW), RUN/SS, LTC1778I .. – 40°C to 125°C PGOOD Voltages ... 7V to – 0.3V Junction Temperature (Note 2) .. 125°C FCB, VON, VRNG Voltages .. INTVCC + 0.3V to –0.3V Storage Temperature Range ... – 65°C to 150°C ITH, VFB Voltages.. 2.7V to –0.3V Lead Temperature (Soldering, 10 sec).. 300°C
U W U PACKAGE/ORDER I FOR ATIO
TOP VIEW ORDER PART TOP VIEW ORDER PART RUN/SS 1 16 BOOST NUMBER RUN/SS 1 16 BOOST NUMBER PGOOD 2 15 TG V 2 15 ON TG LTC1778EGN LTC1778EGN-1 V 3 14 RNG SW V 3 14 RNG SW LTC1778IGN FCB 4 13 PGND FCB 4 13 PGND I 5 12 TH BG I 5 12 TH BG SGND 6 11 INTVCC SGND 6 11 INTVCC I 7 10 V GN PART MARKING I 7 10 V GN PART MARKING ON IN ON IN V 8 9 FB EXTVCC V 8 9 1778 FB EXTVCC 17781 GN PACKAGE 1778I GN PACKAGE 16-LEAD PLASTIC SSOP 16-LEAD PLASTIC SSOP TJMAX = 125°C, θJA = 130°C/ W TJMAX = 125°C, θJA = 130°C/ W Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The
●
denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25
°
C. VIN = 15V unless otherwise noted. 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 1778fb 2