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LTC7813 Datasheet(PDF) 3 Page - Linear Technology |
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LTC7813 Datasheet(HTML) 3 Page - Linear Technology |
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3 / 32 page  LTC7800 3 7800f For more information www.linear.com/LTC7800 The l denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2), VIN = 12V, VRUN = 5V, EXTVCC = 0V unless otherwise noted. ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VIN Input Supply Operating Voltage Range 4 60 V VFB Regulated Feedback Voltage (Note 4); ITH Voltage = 1.2V –40°C to 85°C LTC7800E, LTC7800I LTC7800H l l 0.792 0.788 0.786 0.800 0.800 0.800 0.808 0.812 0.812 V V V IFB Feedback Current (Note 4) ±5 ±50 nA VREFLNREG Reference Voltage Line Regulation (Note 4); VIN = 4.5V to 60V 0.002 0.02 %/V VLOADREG Output Voltage Load Regulation (Note 4) Measured in Servo Loop; ∆ITH Voltage = 1.2V to 0.7V l 0.01 0.1 % (Note 4) Measured in Servo Loop; ∆ITH Voltage = 1.2V to 2V l –0.01 –0.1 % gm Transconductance Amplifier gm (Note 4); ITH = 1.2V; Sink/Source 5µA 2 mmho IQ Input DC Supply Current (Note 5) Pulse Skip or Forced Continuous Mode VFB = 0.83V (No Load) 2 mA Sleep Mode VFB = 0.83V (No Load) 50 75 µA Shutdown RUN = 0V 14 25 µA UVLO Undervoltage Lockout INTVCC Ramping Up INTVCC Ramping Down l l 3.6 3.92 3.80 4.2 4.0 V V VOVL Feedback Overvoltage Protection Measured at VFB Relative to Regulated VFB 7 10 13 % ISENSE+ SENSE+ Pin Current ±1 µA ISENSE– SENSE– Pins Current VSENSE– < INTVCC – 0.5V VSENSE– > INTVCC + 0.5V 700 ±2 µA µA DFMAX Maximum Duty Factor In Dropout; VFREQ = 0V 97 98 % ITRACK/SS Soft-Start Charge Current VTRACK/SS = 0V 7 10 14 µA VRUN On RUN Pin On Threshold VRUN Rising l 1.15 1.21 1.27 V VRUN Hyst RUN Pin Hysteresis 50 mV VSENSE(MAX) Maximum Current Sense Threshold VFB = 0.7V, VSENSE– = 3.3V, ILIM = 0V VFB = 0.7V, VSENSE– = 3.3V, ILIM = INTVCC VFB = 0.7V, VSENSE– = 3.3V, ILIM = FLOAT l l l 22 43 64 30 50 75 36 57 85 mV mV mV Gate Driver TG Pull-Up On-Resistance Pull-Down On-Resistance 2.5 1.5 Ω Ω BG Pull-Up On-Resistance Pull-Down On-Resistance 2.4 1.1 Ω Ω TG tr TG tf TG Transition Time: Rise Time Fall Time (Note 6) CLOAD = 3300pF CLOAD = 3300pF 25 16 ns ns BG tr BG tf BG Transition Time: Rise Time Fall Time (Note 6) CLOAD = 3300pF CLOAD = 3300pF 25 13 ns ns TG/BG t1D Top Gate Off to Bottom Gate On Delay Synchronous Switch-On Delay Time CLOAD = 3300pF 20 ns BG/TG t1D Bottom Gate Off to Top Gate On Delay Top Switch-On Delay Time CLOAD = 3300pF 20 ns |
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