Datasheet LTC3890-1 (Analog Devices) - 3

LTC3890-1
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VRUN1,2 = 5V, EXTVCC = 0V unless otherwise noted. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Input Supply Operating Voltage Range 4 60 V VFB1,2 Regulated Feedback Voltage ITH1,2 Voltage = 1.2V (Note 4) –40°C to 85°C, All Grades 0.792 0.800 0.808 V LTC3890E-1, LTC3890I-1, l 0.788 0.800 0.812 V LTC3890H-1, LTC3890MP-1 l 0.786 0.800 0.812 V IFB1,2 Feedback Current (Note 4) ±5 ±50 nA VREFLNREG Reference Voltage Line Regulation VIN = 4.5V to 60V (Note 4) 0.002 0.02 %/V VLOADREG Output Voltage Load Regulation (Note 4) Measured in Servo Loop, l 0.01 0.1 % ∆ITH Voltage = 1.2V to 0.7V (Note 4) Measured in Servo Loop, l –0.01 –0.1 % ∆ITH Voltage = 1.2V to 2V gm1,2 Transconductance Amplifier gm ITH1,2 = 1.2V, Sink/Source = 5µA (Note 4) 2 mmho IQ Input DC Supply Current (Note 5) Pulse-Skipping or Forced Continuous RUN1 = 5V and RUN2 = 0V, VFB1 = 0.83V or 2 mA Mode (One Channel On) RUN1 = 0V and RUN2 = 5V, VFB2 = 0.83V Pulse-Skipping or Forced Continuous RUN1,2 = 5V, VFB1,2 = 0.83V (No Load) 2 mA Mode (Both Channels On) Sleep Mode (One Channel On) RUN1 = 5V and RUN2 = 0V, VFB1 = 0.83V or 50 75 µA RUN1 = 0V and RUN2 = 5V, VFB2 = 0.83V Sleep Mode (Both Channels On) RUN1,2 = 5V, VFB1,2 = 0.83V (No Load) 60 100 µA Shutdown RUN1,2 = 0V 14 25 µA UVLO Undervoltage Lockout INTVCC Ramping Up l 3.92 4.2 V INTVCC Ramping Down l 3.6 3.80 4.0 V VOVL Feedback Overvoltage Protection Measured at VFB1,2, Relative to Regulated VFB1,2 7 10 13 % I + SENSE SENSE+ Pin Current Each Channel ±1 µA I – SENSE SENSE– Pins Current Each Channel V – SENSE < INTVCC – 0.5V ±1 µA V – SENSE > INTVCC + 0.5V 700 µA DFMAX Maximum Duty Factor In Dropout 98 99 % ITRACK/SS1,2 Soft-Start Charge Current VTRACK1,2 = 0V 0.7 1.0 1.4 µA VRUN1 On RUN1 Pin On Threshold VRUN1 Rising l 1.15 1.21 1.27 V VRUN2 On RUN2 Pin On Threshold VRUN2 Rising l 1.20 1.25 1.30 V VRUN1,2 Hyst RUN Pin Hysteresis 50 mV VSENSE(MAX) Maximum Current Sense Threshold VFB1,2 = 0.7V, VSENSE1–,2– = 3.3V, ILIM = 0 l 64 75 85 mV
Gate Driver
TG1,2 Pull-Up On-Resistance 2.5 Ω Pull-Down On-Resistance 1.5 Ω BG1,2 Pull-Up On-Resistance 2.4 Ω Pull-Down On-Resistance 1.1 Ω TG Transition Time: (Note 6) TG1,2 tr Rise Time CLOAD = 3300pF 25 ns TG1,2 tf Fall Time CLOAD = 3300pF 25 ns BG Transition Time: (Note 6) BG1,2 tr Rise Time CLOAD = 3300pF 25 ns BG1,2 tf Fall Time CLOAD = 3300pF 25 ns 38901fb 3 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts