Datasheet LTC3890-2 (Analog Devices) - 3

LTC3890-2
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified 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 (Note 4) ITH1,2 Voltage = 1.2V –40°C to 85°C, All Grades 0.792 0.800 0.808 V LTC3890E-2, LTC3890I-2 l 0.788 0.800 0.812 V LTC3890H-2, LTC3890MP-2 l 0.786 0.800 0.812 V IFB1,2 Feedback Current (Note 4) ±5 ±50 nA VREFLNREG Reference Voltage Line Regulation (Note 4) VIN = 4.5V to 60V 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 (Note 4) ITH1,2 = 1.2V, Sink/Source = 5µA 2 mmho IQ Input DC Supply Current (Note 5) Pulse-Skipping or Forced Continuous RUN1 = 5V and RUN2 = 0V, VFB1 = 0.83V or 1.3 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 (No Load) or 50 75 µA RUN1 = 0V and RUN2 = 5V, VFB2 = 0.83V (No Load) 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 Maximum TG1, 2 Duty Factor In Dropout 98 99 % ITRACK/SS1,2 Soft-Start Charge Current VTRACK/SS1,2 = 0V 0.7 1.0 1.4 µA VRUN1 RUN1 Pin On Threshold VRUN1 Rising l 1.15 1.21 1.27 V VRUN2 RUN2 Pin On Threshold VRUN2 Rising l 1.20 1.25 1.30 V RUN1,2 Pin Hysteresis 50 mV VSENSE(MAX) Maximum Current Sense Threshold VFB1,2 = 0.7V, VSENSE1–,2– = 3.3V, ILIM = 0 l 22 30 36 mV VFB1,2 = 0.7V, VSENSE1–,2– = 3.3V, ILIM = INTVCC l 43 50 57 mV VFB1,2 = 0.7V, VSENSE1–,2– = 3.3V, ILIM = FLOAT l 64 75 85 mV Rev. A For more information www.analog.com 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts