Datasheet LTC3865, LTC3865-1 (Analog Devices) - 4

LTC3865/LTC3865-1
ELECTRICAL CHARACTERISTICS The
l
denotes the specifi cations which apply over the full operating junction temperature range, otherwise specifi cations are at TA = 25°C (Note 2). 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 l 1.089 1.100 1.111 V VID11 = VID21 = GND, VID12 = VID22 = Float l 0.990 1.000 1.010 V VID11 = VID21 = GND, VID12 = VID22 = INTVCC l 1.188 1.200 1.212 V VID11 = VID21 = Float, VID12 = VID22 = GND l 1.485 1.500 1.515 V VID11 = VID21 = Float, VID12 = VID22 = Float l 0.596 0.602 0.608 V VID11 = VID21 = Float, VID12 = VID22 = INTVCC l 1.782 1.800 1.818 V VID11 = VID21 = INTVCC, VID12 = VID22 = GND l 2.463 2.500 2.538 V VID11 = VID21 = INTVCC, VID12 = VID22 = Float l 3.251 3.300 3.350 V VID11 = VID21 = INTVCC, VID12 = VID22 = INTVCC l 4.925 5.000 5.075 V Output Voltage Sensing (I-Grade) (Note 4) ITH1,2 Voltage = 1.2V VID11 = VID21 = GND, VID12 = VID22 = GND l 1.084 1.100 1.117 V VID11 = VID21 = GND, VID12 = VID22 = Float l 0.985 1.000 1.015 V VID11 = VID21 = GND, VID12 = VID22 = INTVCC l 1.182 1.200 1.218 V VID11 = VID21 = Float, VID12 = VID22 = GND l 1.478 1.500 1.523 V VID11 = VID21 = Float, VID12 = VID22 = Float l 0.593 0.602 0.611 V VID11 = VID21 = Float, VID12 = VID22 = INTVCC l 1.773 1.800 1.827 V VID11 = VID21 = INTVCC, VID12 = VID22 = GND l 2.450 2.500 2.550 V VID11 = VID21 = INTVCC, VID12 = VID22 = Float l 3.234 3.300 3.366 V VID11 = VID21 = INTVCC, VID12 = VID22 = INTVCC l 4.900 5.000 5.100 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; ΔITH Voltage = 1.2V to 0.7V l 0.01 0.1 % Measured in Servo Loop; ΔITH Voltage = 1.2V to 1.6V l –0.01 –0.1 % gm1,2 Transconductance Amplifi er gm ITH1,2 = 1.2V; Sink/Source 5μA; (Note 4) 2.2 mmho IQ Input DC Supply Current (Note 5) Normal Mode VIN = 15V 3 mA Shutdown VRUN1,2 = 0V 30 50 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 VITH1,2 = 3.3V, ILIM = 0V l 24 30 36 mV (E-Grade) VITH1,2 = 3.3V, ILIM = Float (Note 8) l 44 50 56 mV VITH1,2 = 3.3V, ILIM = INTVCC l 68 75 82 mV In Overvoltage Condition l –63 –53 –43 mV Maximum Current Sense Threshold VITH1,2 = 3.3V, ILIM = 0V l 22 30 38 mV (I-Grade) VITH1,2 = 3.3V, ILIM = Float (Note 8) l 42 50 58 mV VITH1,2 = 3.3V, ILIM = INTVCC l 66 75 84 mV In Overvoltage Condition l –65 –53 –41 mV 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 3865fb 4