Datasheet LTC3890-3 (Analog Devices) - 3

LTC3890-3
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 VOUT Regulated Output Voltage Range 0.8 24 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-3, LTC3890I-3, l 0.788 0.800 0.812 V LTC3890H-3, LTC3890MP-3 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 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 TG1,2 Pull-Down On-Resistance 1.5 Ω BG1,2 Pull-Up On-Resistance 2.4 Ω BG1,2 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 38903f For more information www.linear.com/3890-3 3 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Typical Performance Characteristics Operation Package Description Typical Application