Datasheet LTC3895 (Analog Devices) - 3

LTC3895
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, VRUN = 5V, VEXTVCC = 0V, VDRVSET = 0V, VPRG = FLOAT unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Input Supply Operating Voltage Range (Note 10) DRVUV = 0V l 4 140 V VOUT Regulated Output Voltage Set Point 0.8 60 V VFB Regulated Feedback Voltage (Note 4); ITH Voltage = 1.2V 0°C to 85°C, VPRG = FLOAT 0.792 0.800 0.808 V VPRG = FLOAT l 0.788 0.800 0.812 V VPRG = 0V l 3.220 3.300 3.380 V VPRG = INTVCC l 4.875 5.000 5.125 V IFB Feedback Current (Note 4) VPRG = FLOAT –0.006 ±0.050 µA VPRG = 0V or INTVCC 4 6 µA Reference Voltage Line Regulation (Note 4) VIN = 4.5V to 150V 0.002 0.02 %/V Output Voltage Load Regulation (Note 4) Measured in Servo Loop, ∆ITH Voltage = 1.2V to 0.7V l 0.01 0.1 % (Note 4) Measured in Servo Loop, ∆ITH Voltage = 1.2V to 1.6V l –0.01 –0.1 % gm Transconductance Amplifier gm (Note 4) ITH = 1.2V, Sink/Source 5µA 2.2 mmho IQ Input DC Supply Current (Note 5) VDRVSET = 0V Pulse Skip or Forced Continuous Mode VFB = 0.83V (No Load) 2.5 mA Sleep Mode VFB = 0.83V (No Load) 40 55 µA Shutdown RUN = 0V 10 20 µA UVLO Undervoltage Lockout DRVCC Ramping Up DRVUV = 0V l 4.0 4.2 V DRVUV = INTVCC, DRVSET = INTVCC l 7.5 7.8 V DRVCC Ramping Down DRVUV = 0V l 3.6 3.8 4.0 V DRVUV = INTVCC, DRVSET = INTVCC l 6.4 6.7 7.0 V VRUN ON RUN Pin ON Threshold VRUN Rising l 1.1 1.2 1.3 V VRUN Hyst RUN Pin Hysteresis 80 mV OVLO Overvoltage Lockout Threshold VOVLO Rising l 1.1 1.2 1.3 V OVLO Hyst OVLO Hysteresis 100 mV OVLO Delay 1 µs Feedback Overvoltage Protection Measured at VFB, Relative to Regulated VFB 7 10 13 % ISENSE+ SENSE+ Pin Current ±1 µA ISENSE– SENSE– Pin Current SENSE– < VINTVCC – 0.5V ±1 µA SENSE– > VINTVCC + 0.5V 850 µA Maximum Duty Factor In Dropout CPUMP_EN = 0V, FREQ = 0V 98 99 % CPUMP_EN = INTVCC 100 ISS Soft-Start Charge Current VSS = 0V 8 10 12 µA VSENSE(MAX) Maximum Current Sense Threshold VFB = 0.7V, VSENSE– = 3.3V ILIM = FLOAT l 66 75 84 mV ILIM = 0V l 43 50 57 mV ILIM = INTVCC l 90 100 109 mV 3895fa For more information www.linear.com/LTC3895 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