Datasheet LTC3892, LTC3892-1, LTC3892-2 (Analog Devices) - 4

LTC3892/ LTC3892-1/LTC3892-2
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 12V, VRUN1,2 = 5V, VEXTVCC = 0V, VDRVSET = 0V, VPRG1 = FLOAT unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Input Supply Operating Voltage Range 4.5 60 V VFB1 Channel 1 Regulated Feedback (Note 4) ITH1 Voltage = 1.2V Voltage 0°C to 85°C, VPRG1 = FLOAT (LTC3892/LTC3892-2) or LTC3892-1 0.792 0.800 0.808 V VPRG1 = FLOAT (LTC3892/LTC3892-2) or LTC3892-1 l 0.788 0.800 0.812 V VPRG1 = 0V (LTC3892/LTC3892-2) l 3.234 3.3 3.366 V VPRG1 = INTVCC (LTC3892/LTC3892-2) l 4.890 5.0 5.110 V VFB2 Channel 2 Regulated Feedback (Note 4) ITH2 Voltage = 1.2V V Voltage 0°C to 85°C 0.792 0.800 0.808 V l 0.788 0.800 0.812 IFB2 Channel 2 Feedback Current (Note 4) –2 ±50 nA IFB1 Channel 1 Feedback Current (Note 4) VPRG1 = FLOAT (LTC3892/LTC3892-2) or LTC3892-1 –0.002 ±0.05 µA VPRG1 = 0V (LTC3892/LTC3892-2) 4 6 µA VPRG1 = INTVCC (LTC3892/LTC3892-2) 4 6 µA 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) VDRVSET = 0V Pulse-Skipping or Forced Continuous RUN1 = 5V and RUN2 = 0V or 1.6 mA Mode (One Channel On) RUN2 = 5V and RUN1 = 0V, VFB1,2 = 0.83V (No Load) Pulse-Skipping or Forced Continuous RUN1,2 = 5V, VFB1,2 = 0.83V (No Load) 2.8 mA Mode (Both Channels On) Sleep Mode (One Channel On) RUN1 = 5V and RUN2 = 0V or l 29 55 µA RUN2 = 5V and RUN1 = 0V, VFB1,2 = 0.83V (No Load) Sleep Mode (Both Channels On) RUN1,2 = 5V, VFB1,2 = 0.83V (No Load) 34 55 µA Shutdown RUN1,2 = 0V 3.6 10 µA UVLO Undervoltage Lockout DRVCC Ramping Up DRVUV = 0V l 4.0 4.2 V DRVUV = INTVCC l 7.5 7.8 V DRVCC Ramping Down DRVUV = 0V l 3.6 3.8 4.0 V DRVUV = INTVCC l 6.4 6.7 7.0 V VOVL1,2 Feedback Overvoltage Protection Measured at VFB1,2 Relative to Regulated VFB1,2 7 10 13 % (LTC3892/LTC3892-1) ISENSE1,2+ SENSE+ Pin Current ±1 µA ISENSE1,2– SENSE– Pins Current VOUT1,2 < VINTVCC – 0.5V ±1 µA VOUT1,2 > VINTVCC + 0.5V 700 µA DFMAX(TG) Maximum Duty Factor for TG In Dropout, FREQ = 0V 97.5 99 % ITRACK/SS1,2 Soft-Start Charge Current VTRACK/SS1,2 = 0V 8 10 12 µA 38921fc 4 For more information www.linear.com/LTC3892 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Typical Performance Characteristics Pin Functions Functional Diagrams Operation Package Description Typical Application Related Parts