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LTC3865IUHTRPBF Datasheet(PDF) 4 Page - Linear Technology |
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LTC3865IUHTRPBF Datasheet(HTML) 4 Page - Linear Technology |
4 / 36 page LTC3865/LTC3865-1 3865f elecTrical characTerisTics The l denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TJ = 25°C. VIN = 15V, VRUN1,2 = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loops VIN Input Voltage 4.5 38 V VOSENSE1,2 Output Voltage Sensing (E-Grade) (Note 4) ITH1,2 Voltage = 1.2V VID11 = VID21 = GND, VID12 = VID22 = GND VID11 = VID21 = GND, VID12 = VID22 = Float VID11 = VID21 = GND, VID12 = VID22 = INTVCC VID11 = VID21 = Float, VID12 = VID22 = GND VID11 = VID21 = Float, VID12 = VID22 = Float VID11 = VID21 = Float, VID12 = VID22 = INTVCC VID11 = VID21 = INTVCC, VID12 = VID22 = GND VID11 = VID21 = INTVCC, VID12 = VID22 = Float VID11 = VID21 = INTVCC, VID12 = VID22 = INTVCC l l l l l l l l l 1.089 0.990 1.188 1.485 0.596 1.782 2.463 3.251 4.925 1.100 1.000 1.200 1.500 0.602 1.800 2.500 3.300 5.000 1.111 1.010 1.212 1.515 0.608 1.818 2.538 3.350 5.075 V V V V V V V V V Output Voltage Sensing (I-Grade) (Note 4) ITH1,2 Voltage = 1.2V VID11 = VID21 = GND, VID12 = VID22 = GND VID11 = VID21 = GND, VID12 = VID22 = Float VID11 = VID21 = GND, VID12 = VID22 = INTVCC VID11 = VID21 = Float, VID12 = VID22 = GND VID11 = VID21 = Float, VID12 = VID22 = Float VID11 = VID21 = Float, VID12 = VID22 = INTVCC VID11 = VID21 = INTVCC, VID12 = VID22 = GND VID11 = VID21 = INTVCC, VID12 = VID22 = Float VID11 = VID21 = INTVCC, VID12 = VID22 = INTVCC l l l l l l l l l 1.084 0.985 1.182 1.478 0.593 1.773 2.450 3.234 4.900 1.100 1.000 1.200 1.500 0.602 1.800 2.500 3.300 5.000 1.117 1.015 1.218 1.523 0.611 1.827 2.550 3.366 5.100 V V V V V V V V V IOSENSE1,2 Feedback Current (Note 4) VID11 = VID21 = VID12 = VID22 = Float –10 –50 nA VREFLNREG Reference Voltage Line Regulation VIN = 4.5V to 38V (Note 4) 0.002 0.02 %/V VLOADREG Output Voltage Load Regulation (Note 4) Measured in Servo Loop; ∆ITH Voltage = 1.2V to 0.7V Measured in Servo Loop; ∆ITH Voltage = 1.2V to 1.6V l l 0.01 –0.01 0.1 –0.1 % % gm1,2 Transconductance Amplifier gm ITH1,2 = 1.2V; Sink/Source 5µA; (Note 4) 2.2 mmho IQ Input DC Supply Current Normal Mode Shutdown (Note 5) VIN = 15V VRUN1,2 = 0V 3 30 50 mA µA UVLO Undervoltage Lockout on INTVCC VINTVCC Ramping Down 3.3 V UVLOHYS UVLO Hysteresis 0.55 V VOVL Feedback Overvoltage Lockout Measured at VOSENSE1,2 with VID Pins Floating l 0.64 0.66 0.68 V ISENSE Sense Pins Total Current (Each Channel); VSENSE1,2 = 3.3V ±1 ±2 µA DFMAX Maximum Duty Cycle In Dropout 94 95 % ITK/SS1,2 Soft-Start Charge Current VTK/SS1,2 = 0V 0.9 1.3 1.7 µA VRUN1,2 RUN Pin On Threshold VRUN1, VRUN2 Rising l 1.1 1.22 1.35 V VRUN1,2HYS RUN Pin On Hysteresis 80 mV IRUN1,2HYS RUN Pin Current Hysteresis 4.5 µA VSENSE(MAX) Maximum Current Sense Threshold (E-Grade) VITH1,2 = 3.3V, ILIM = 0V VITH1,2 = 3.3V, ILIM = Float VITH1,2 = 3.3V, ILIM = INTVCC In Overvoltage Condition l l l l 24 44 68 –63 30 50 75 –53 36 56 82 –43 mV mV mV mV Maximum Current Sense Threshold (I-Grade) VITH1,2 = 3.3V, ILIM = 0V VITH1,2 = 3.3V, ILIM = Float VITH1,2 = 3.3V, ILIM = INTVCC In Overvoltage Condition l l l l 22 42 66 –65 30 50 75 –53 38 58 84 –41 V V V V TG RUP TG Driver Pull-Up On-Resistance TG High 2.6 Ω TG RDOWN TG Driver Pull-Down On-Resistance TG Low 1.5 Ω BG RUP BG Driver Pull-Up On-Resistance BG High 3 Ω |
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