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LT8631 Datasheet(PDF) 3 Page - Linear Technology |
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LT8631 Datasheet(HTML) 3 Page - Linear Technology |
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3 / 38 page  LTC3895 3 3895fa For more information www.linear.com/LTC3895 elecTrical characTerisTics 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 VPRG = FLOAT VPRG = 0V VPRG = INTVCC l l l 0.792 0.788 3.220 4.875 0.800 0.800 3.300 5.000 0.808 0.812 3.380 5.125 V V V V IFB Feedback Current (Note 4) VPRG = FLOAT VPRG = 0V or INTVCC –0.006 4 ±0.050 6 µA 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 DRVUV = INTVCC, DRVSET = INTVCC l l 4.0 7.5 4.2 7.8 V V DRVCC Ramping Down DRVUV = 0V DRVUV = INTVCC, DRVSET = INTVCC l l 3.6 6.4 3.8 6.7 4.0 7.0 V 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 SENSE– > VINTVCC + 0.5V 850 ±1 µA µA Maximum Duty Factor In Dropout CPUMP_EN = 0V, FREQ = 0V CPUMP_EN = INTVCC 98 100 99 % 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 ILIM = 0V ILIM = INTVCC l l l 66 43 90 75 50 100 84 57 109 mV mV mV 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. |
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