Datasheet LTC1773 (Analog Devices) - 2
| Fabricante | Analog Devices |
| Descripción | Synchronous Step-Down DC/DC Controller |
| Páginas / Página | 20 / 2 — ABSOLUTE AXI U. RATI GS. PACKAGE/ORDER I FOR ATIO. (Note 1). Order … |
| Formato / tamaño de archivo | PDF / 300 Kb |
| Idioma del documento | Inglés |
ABSOLUTE AXI U. RATI GS. PACKAGE/ORDER I FOR ATIO. (Note 1). Order Options. ELECTRICAL CHARACTERISTICS The
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LTC1773
W W W U U W U ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1)
Input Supply Voltage .. –0.3V to 10.0V ORDER PART ITH Voltage .. –0.3V to 2.5V TOP VIEW NUMBER RUN/SS, V I 1 TH 10 SW FB, SENSE– Voltages .. –0.3V to VIN RUN/SS 2 9 SENSE– LTC1773EMS SYNC/FCB Voltage .. –0.3V to V SYNC/FCB 3 8 V IN IN V 4 FB 7 TG BG, TG Voltages...–0.3V to VIN GND 5 6 BG MS PART MARKING SW Voltage ... – 5V to 11V MS PACKAGE 10-LEAD PLASTIC MSOP Operating Ambient Temperature Range T LTMV JMAX = 125°C, θJA = 120°C/W (Note 2) ...–40°C to 85°C Junction Temperature (Note 3) ... 125°C
Order Options
Tape and Reel: Add #TR Storage Temperature Range ..–65°C to 150°C Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: http://www.linear.com/leadfree/ Lead Temperature (Soldering, 10 sec.)... 300°C Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The
●
denotes specifications which apply over the full operating temperature range, TA = 25
°
C. VIN = 5V unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IVFB Feedback Current (Note 4) 20 60 nA VFB Regulated Feedback Voltage (Note 4) ● 0.788 0.80 0.812 V ∆VOVL ∆Output Overvoltage Lockout ∆VOVL = VOVL – VFB 40 60 80 mV ∆VFB Reference Voltage Line Regulation VIN = 2.7V to 8.5V (Note 4) 0.002 0.02 %/V VLOADREG Output Voltage Load Regulation ITH at 1.0V (Note 4) 0.2 0.8 % ITH at 0.6V (Note 4) –0.2 –0.8 % IS Input DC Bias Current (Note 5) Normal Mode VIN = 5V, VITH = OPEN, VSYNC/MODE = OPEN 400 600 µA Burst Mode Operation VITH = 0V, VIN = 5V, VSYNC/MODE = OPEN 80 µA Shutdown VRUN/SS = 0V, 2.7V < VIN < 8.5V 10 30 µA Shutdown VRUN/SS = 0V, VIN < 2.4V 2 5 µA VRUN/SS RUN/SS Threshold 0.4 0.7 1.0 V IRUN/SS Soft-Start Current Source VRUN/SS = 0V 0.75 1.5 2.5 µA VSYNC/FCB Auxiliary Feedback Threshold VSYNC/FCB Ramping Negative 0.76 0.8 0.84 V ISYNC/FCB SYNC/FCB Pull-Up Current VSYNC/FCB = 0V 0.1 0.4 1.0 µA fOSC Oscillator Frequency VFB = 0.8V 500 550 600 kHz VFB = 0V 55 kHz VUVLO Undervoltage Lockout VIN Ramping Down from 3V ● 2.35 2.5 2.65 V VIN Ramping Up from 0V ● 2.65 2.8 V ∆VSENSE(MAX) Maximum Current Sense Voltage ● 85 100 115 mV TG tr Top Gate Drive Rise Time CLOAD = 3000pF (Note 6) 45 160 ns TG tf Top Gate Drive Fall Time CLOAD = 3000pF (Note 6) 48 150 ns BG tr Bottom Gate Drive Rise Time CLOAD = 3000pF (Note 6) 80 180 ns BG tf Bottom Gate Drive Fall Time CLOAD = 3000pF (Note 6) 45 150 ns 1773fb 2
W W W U U W U ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1)
Input Supply Voltage .. –0.3V to 10.0V ORDER PART ITH Voltage .. –0.3V to 2.5V TOP VIEW NUMBER RUN/SS, V I 1 TH 10 SW FB, SENSE– Voltages .. –0.3V to VIN RUN/SS 2 9 SENSE– LTC1773EMS SYNC/FCB Voltage .. –0.3V to V SYNC/FCB 3 8 V IN IN V 4 FB 7 TG BG, TG Voltages...–0.3V to VIN GND 5 6 BG MS PART MARKING SW Voltage ... – 5V to 11V MS PACKAGE 10-LEAD PLASTIC MSOP Operating Ambient Temperature Range T LTMV JMAX = 125°C, θJA = 120°C/W (Note 2) ...–40°C to 85°C Junction Temperature (Note 3) ... 125°C
Order Options
Tape and Reel: Add #TR Storage Temperature Range ..–65°C to 150°C Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: http://www.linear.com/leadfree/ Lead Temperature (Soldering, 10 sec.)... 300°C Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The
●
denotes specifications which apply over the full operating temperature range, TA = 25
°
C. VIN = 5V unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IVFB Feedback Current (Note 4) 20 60 nA VFB Regulated Feedback Voltage (Note 4) ● 0.788 0.80 0.812 V ∆VOVL ∆Output Overvoltage Lockout ∆VOVL = VOVL – VFB 40 60 80 mV ∆VFB Reference Voltage Line Regulation VIN = 2.7V to 8.5V (Note 4) 0.002 0.02 %/V VLOADREG Output Voltage Load Regulation ITH at 1.0V (Note 4) 0.2 0.8 % ITH at 0.6V (Note 4) –0.2 –0.8 % IS Input DC Bias Current (Note 5) Normal Mode VIN = 5V, VITH = OPEN, VSYNC/MODE = OPEN 400 600 µA Burst Mode Operation VITH = 0V, VIN = 5V, VSYNC/MODE = OPEN 80 µA Shutdown VRUN/SS = 0V, 2.7V < VIN < 8.5V 10 30 µA Shutdown VRUN/SS = 0V, VIN < 2.4V 2 5 µA VRUN/SS RUN/SS Threshold 0.4 0.7 1.0 V IRUN/SS Soft-Start Current Source VRUN/SS = 0V 0.75 1.5 2.5 µA VSYNC/FCB Auxiliary Feedback Threshold VSYNC/FCB Ramping Negative 0.76 0.8 0.84 V ISYNC/FCB SYNC/FCB Pull-Up Current VSYNC/FCB = 0V 0.1 0.4 1.0 µA fOSC Oscillator Frequency VFB = 0.8V 500 550 600 kHz VFB = 0V 55 kHz VUVLO Undervoltage Lockout VIN Ramping Down from 3V ● 2.35 2.5 2.65 V VIN Ramping Up from 0V ● 2.65 2.8 V ∆VSENSE(MAX) Maximum Current Sense Voltage ● 85 100 115 mV TG tr Top Gate Drive Rise Time CLOAD = 3000pF (Note 6) 45 160 ns TG tf Top Gate Drive Fall Time CLOAD = 3000pF (Note 6) 48 150 ns BG tr Bottom Gate Drive Rise Time CLOAD = 3000pF (Note 6) 80 180 ns BG tf Bottom Gate Drive Fall Time CLOAD = 3000pF (Note 6) 45 150 ns 1773fb 2