Datasheet LTC3891 (Analog Devices) - 3

LTC3891
ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3891EFE#PBF LTC3891EFE#TRPBF LTC3891FE 20-Lead Plastic TSSOP –40°C to 125°C LTC3891IFE#PBF LTC3891IFE#TRPBF LTC3891FE 20-Lead Plastic TSSOP –40°C to 125°C LTC3891HFE#PBF LTC3891HFE#TRPBF LTC3891FE 20-Lead Plastic TSSOP –40°C to 150°C LTC3891MPFE#PBF LTC3891MPFE#TRPBF LTC3891FE 20-Lead Plastic TSSOP –55°C to 150°C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2), VIN = 12V, VRUN = 5V, EXTVCC = 0V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Input Supply Operating Voltage Range 4 60 V VFB Regulated Feedback Voltage (Note 4); ITH Voltage = 1.2V –40°C to 85°C 0.792 0.800 0.808 V LTC3891E, LTC3891I l 0.788 0.800 0.812 V LTC3891H, LTC3891MP l 0.786 0.800 0.812 V IFB 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) l 0.01 0.1 % Measured in Servo Loop; ∆ITH Voltage = 1.2V to 0.7V (Note 4) l –0.01 –0.1 % Measured in Servo Loop; ∆ITH Voltage = 1.2V to 2V gm Transconductance Amplifier gm (Note 4); ITH = 1.2V; Sink/Source 5µA 2 mmho IQ Input DC Supply Current (Note 5) Pulse Skip or Forced Continuous Mode VFB = 0.83V (No Load) 2 mA Sleep Mode VFB = 0.83V (No Load) 50 75 µA Shutdown RUN = 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 VFB Relative to Regulated VFB 7 10 13 % I + SENSE SENSE+ Pin Current ±1 µA I – – SENSE SENSE– Pins Current VSENSE < INTVCC – 0.5V ±2 µA V – SENSE > INTVCC + 0.5V 700 µA DFMAX Maximum Duty Factor In Dropout 98 99 % ITRACK/SS Soft-Start Charge Current VTRACK = 0V 7 10 14 µA VRUN On RUN Pin On Threshold VRUN Rising l 1.15 1.21 1.27 V VRUN Hyst RUN Pin Hysteresis 50 mV V – SENSE(MAX) Maximum Current Sense Threshold VFB = 0.7V, VSENSE = 3.3V, ILIM = 0 l 22 30 36 mV V – FB = 0.7V, VSENSE = 3.3V, ILIM = INTVCC l 43 50 57 mV V – FB = 0.7V, VSENSE = 3.3V, ILIM = FLOAT l 64 75 85 mV 3891fa 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions FUNCTIONAL Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts