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LTC3827-1 Datasheet(PDF) 3 Page - Linear Technology |
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LTC3827-1 Datasheet(HTML) 3 Page - Linear Technology |
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3 / 32 page  LTC3827-1 3 38271fe ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VRUN/SS1, 2 = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loops VFB1, 2 Regulated Feedback Voltage (Note 4) ITH1, 2 Voltage = 1.2V ● 0.792 0.800 0.808 V IVFB1, 2 Feedback Current (Note 4) – 5 –50 nA VREFLNREG Reference Voltage Line Regulation VIN = 4V to 30V (Note 4) 0.002 0.02 %/V VLOADREG Output Voltage Load Regulation (Note 4) Measured in Servo Loop; ΔITH Voltage = 1.2V to 0.7V Measured in Servo Loop; ΔITH Voltage = 1.2V to 2V ● ● 0.1 – 0.1 0.5 –0.5 % % gm1, 2 Transconductance Amplifier gm ITH1, 2 = 1.2V; Sink/Source 5μA (Note 4) 1.55 mmho IQ Input DC Supply Current Sleep Mode (Channel 1 On) Sleep Mode (Channel 2 On) Shutdown Sleep Mode (Both Channels) (Note 5) RUN1 = 5V, RUN2 = 0V, VFB1 = 0.83V (No Load) RUN1 = 0V, RUN2 = 5V, VFB2 = 0.83V (No Load) VRUN1, 2 = 0V RUN1,2 = 5V, VFB1 = VFB2 = 0.83V 80 80 8 115 125 125 20 160 μA μA μA μA UVLO Undervoltage Lockout VIN Ramping Down ● 3.5 4 V VOVL Feedback Overvoltage Lockout Measured at VFB1, 2, Relative to Regulated VFB1, 2 810 12 % ISENSE Sense Pins Total Source Current (Each Channel) VSENSE1–, 2– = VSENSE1+, 2+ = 0V –660 μA DFMAX Maximum Duty Factor In Dropout 98 99.4 % ITRACK/SS1, 2 Soft-Start Charge Current VTRACK1, 2 = 0V 0.75 1.0 1.35 μA VRUN1, 2 ON RUN Pin ON Threshold VRUN1, VRUN2 Rising 0.5 0.7 0.9 V VSENSE(MAX) Maximum Current Sense Threshold VFB1, 2 = 0.7V, VSENSE1–, 2– = 3.3V VFB1, 2 = 0.7V, VSENSE1–, 2– = 3.3V ● 90 80 100 100 110 115 mV mV TG1, 2 tr TG1, 2 tf TG Transition Time: Rise Time Fall Time (Note 6) CLOAD = 3300pF CLOAD = 3300pF 50 50 90 90 ns ns BG1, 2 tr BG1, 2 tf BG Transition Time: Rise Time Fall Time (Note 6) CLOAD = 3300pF CLOAD = 3300pF 40 40 90 80 ns ns TG/BG t1D Top Gate Off to Bottom Gate On Delay Synchronous Switch-On Delay Time CLOAD = 3300pF Each Driver 70 ns BG/TG t2D Bottom Gate Off to Top Gate On Delay Top Switch-On Delay Time CLOAD = 3300pF Each Driver 70 ns tON(MIN) Minimum On-Time (Note 7) 180 ns INTVCC Linear Regulator VINTVCCVIN Internal VCC Voltage 8.5V < VIN < 30V, VEXTVCC = 0V 5.0 5.25 5.5 V VLDOVIN INTVCC Load Regulation ICC = 0mA to 20mA, VEXTVCC = 0V 0.2 1.0 % VINTVCCEXT Internal VCC Voltage VEXTVCC = 8.5V 7.2 7.5 7.8 V VLDOEXT INTVCC Load Regulation ICC = 0mA to 20mA, VEXTVCC = 8.5V 0.2 1.0 % VEXTVCC EXTVCC Switchover Voltage EXTVCC Ramping Positive 4.5 4.7 V VLDOHYS EXTVCC Hysteresis 0.2 V Oscillator and Phase-Locked Loop fNOM Nominal Frequency VPLLLPF = Floating; PLLIN/MODE = DC Voltage 360 400 440 kHz |
Similar Part No. - LTC3827-1 |
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Similar Description - LTC3827-1 |
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