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LTC3854IDDB Datasheet(PDF) 3 Page - Linear Technology |
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LTC3854IDDB Datasheet(HTML) 3 Page - Linear Technology |
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3 / 28 page  LTC3854 3854fa elecTrical characTerisTics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VRUN = 5V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loop VIN Operating Input Voltage Range 4.5 38 V VFB Regulated Feedback Voltage (Note 4); ITH Voltage = 1.2V l 0.792 0.8 0.808 V IFB Feedback Current (Note 4) ±5 ±50 nA VREFLNREG Reference Voltage Line Regulation VIN = 6V to 38V (Note 4) 0.002 0.02 %/V VLOADREG Output Voltage Load Regulation (Note 4) Measured in Servo Loop; ∆ITH Voltage = 0.7V to 1.2V Measured in Servo Loop; ∆ITH Voltage = 1.2V to 2V l l 0.1 –0.1 0.5 –0.5 % % gm Transconductance Amplifier gm ITH = 1.2V; Sink/Source = 5µA (Note 4) 2.0 mmho gmGBW Transconductance Amplifier GBW ITH = 1.2V; (Guaranteed by Design) 3 MHz IQ Input DC Supply Current Normal Mode Shutdown (Note 5) RUN = 0V 2 10 3 25 mA µA UVLO Undervoltage Lockout VIN Ramping Down; Measured at INTVCC l 3.0 3.5 V UVLOHYST Undervoltage Lockout Hysteresis VIN Ramping Down then Up; Measured at INTVCC 350 mV VOVL Feedback Overvoltage Lockout Measured at FB l 0.86 0.88 0.90 V ISENSE Sense Pins Source Current VSENSE– = VSENSE+ = 3.3V ±0.5 ±1 µA DFMAX Maximum Duty Factor In Dropout 97 98 % IRUN/SS Soft-Start Charge Current RUN/SS = 0V 0.6 1.25 2.0 µA VRUN/SS_SD Shutdown Threshold RUN/SS Pin Must be Taken Below this Value to Reset Part (or Put into Shutdown Mode) 0.4 V VRUN/SS_ON Soft-Start Threshold Soft-Start Mode 1.2 V VSENSE(MAX) Maximum Current Sense Threshold FB = 0.7V, VSENSE– = 3.3V, VIN = 6V 40 50 65 mV TG RUP TG Driver Pull-Up On Resistance TG High 2.5 Ω TG RDOWN TG Driver Pull-Down On Resistance TG Low 1.2 Ω BG RUP BG Driver Pull-Up On Resistance BG High 2.5 Ω BG RDOWN BG Driver Pull-down On Resistance BG Low 2.1 Ω TG tr TG tf TG Transition Time: Rise Time Fall Time (Note 6) CLOAD = 3300pF CLOAD = 3300pF 25 25 ns ns BG tr BG tf BG Transition Time: Rise Time Fall Time (Note 6) CLOAD = 3300pF CLOAD = 3300pF 25 25 ns ns TG/BG t1D Top Gate Off to Bottom Gate On Delay Synchronous Switch-On Delay Time CLOAD = 3300pF Each Driver 30 ns BG/TG t2D Bottom Gate Off to Top Gate On Delay Top Switch-On Delay Time CLOAD = 3300pF Each Driver 30 ns tON(MIN) Minimum On-Time (Note 7) 75 ns INTVCC Linear Regulator VINTVCC Internal VCC Voltage 6V < VIN < 38V 4.8 5.0 5.2 V VLDO INT INTVCC Load Regulation ICC = 0 to 20mA 0.2 1.0 % Oscillator fSW Switching Frequency 360 400 440 kHz |
Similar Part No. - LTC3854IDDB |
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Similar Description - LTC3854IDDB |
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