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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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LTC4449 Datenblatt(PDF) 3 Page - Linear Technology |
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LTC4449 Datenblatt(HTML) 3 Page - Linear Technology |
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3 / 38 page  LTC3774 3 3774fc For more information www.linear.com/LTC3774 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 15V, VRUN = 5V unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loop/Whole System VIN Input Voltage Range 4.5 38 V VOUT Output Voltage Range l 0.6 3.5 V VOSNS+ Regulated Feedback Voltage ITH = 1.2V (Note 3) l 595.5 600 604.5 mV IOSNS+ Feedback Current –30 –100 nA VREFLNREG Reference Voltage Line Regulation VIN = 4.5V to 38V 0.002 0.01 %/V VLOADREG Output Voltage Load Regulation ∆ITH = 1.2V to 0.7V ∆ITH = 1.2V to 1.6V l l 0.01 0.01 0.1 0.1 % % gm Transconductance Amplifier gm ITH = 1.2V, Sink/Source 5µA 2 mmho f0dB DA Unity-Gain Crossover Frequency (Note 5) 4 MHz VOVL Feedback Overvoltage Lockout Measured at VOSNS+ l 5 7.5 10 % IQ Input DC Supply Current Normal Mode Shutdown (Note 4) VRUN = 0V 9 40 60 mA µA DFMAX Maximum Duty Factor In Dropout 96 98 % UVLO Undervoltage Lockout VINTVCC Falling 3.5 3.75 4.0 V UVLOHYS UVLO Hysteresis 500 mV ISNSA+ Sense Pin Bias Currents VSNSA+ = 3.3V ±0.5 ±2 µA ISNSD+ Sense Pin Bias Currents VSNSD+ = 3.3V 30 nA ISNS– Sense Pin Bias Currents VSNS– = 3.3V 10 µA AVT_SNS Total Sense Signal Gain to Current Comparator 5 V/V ITEMP DCR Tempco Compensation Current VITEMP = 0.5V l 27 30 33 µA ITK/SS Soft-Start Charge Current VTK/SS = 0V l 1 1.25 1.5 µA tSS(INTERNAL) Internal Soft-Start Time VTK/SS = 5V 600 µs VHIZB HIZB Pin On Threshold VHIZB Rising 2.2 V VHIZB_HYS HIZB Pin On Hysteresis 600 mV VRUN RUN Pin On Threshold VRUN Rising l 1.1 1.22 1.34 V VRUN_HYS RUN Pin On Hysteresis 80 mV IRUN RUN Pin Pull-Up Current RUN < On Threshold RUN > On Threshold RUN < 1.1V RUN > 1.34V 1 5 µA µA VSENSE(MAX) Maximum Current Sense Threshold ITH = 2V, VSNS– = 3.3V ILIM = 0V ILIM = 1/4 INTVCC ILIM = Float ILIM = 3/4 INTVCC ILIM = INTVCC l l l l l 9.25 14 19 24 28.25 10.25 15 20 25 29.75 11.25 16 21 26 31.25 mV mV mV mV mV Power Good VPGOOD(ON) PGOOD Pull-Down Resistance 90 200 Ω IPGOOD(OFF) PGOOD Leakage Current VPGOOD = 5V –2 2 µA tPGOOD VPGOOD High to Low Delay 45 µs VPGOOD PGOOD Trip Level VOSNS+ with Respect to Set Output Voltage VOSNS+ Ramping Up VOSNS+ Ramping Down 5 –5 7.5 –7.5 10 –10 % % |
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