Datasheet LTC3866 (Analog Devices) - 3

LTC3866
e lecTrical characTerisTics The
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denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 15V, VRUN = 5V unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loops
VIN Input Voltage Range 4.5 38 V VOUT Output Voltage Range with Diffamp in Loop 0.6 3.5 V VFB Regulated Feedback Voltage Current ITH Voltage = 1.2V (Note 5) –40°C to 85°C l 0.597 0.6 0.603 V –40°C to 125°C l 0.5955 0.6 0.6045 V IFB Feedback Current (Note 5) –15 –50 nA VREFLNREG Reference Voltage Line VIN = 4.5V to 38V (Note 5) 0.002 0.02 % Regulation VLOADREG Output Voltage Load (Note 5) Regulation Measured in Servo Loop; ∆ITH Voltage = 1.2V to 0.7V l 0.01 0.1 % Measured in Servo Loop; ∆ITH Voltage = 1.2V to 1.6V l 0.01 0.1 % gm Error Amplifier (EA) ITH =1.2V, Sink/Source 5µA (Note 5) 2 mmho Transconductance IQ Input DC Supply Current (Note 6) Normal Mode VIN = 15V 3.2 mA Shutdown VIN = 15V, VRUN = 0V 30 50 µA UVLO Undervoltage Lockout VINTVCC Ramping Down 3.4 3.75 4.1 V UVLOHYS UVLO Hysteresis Voltage 0.5 V VFBOVL Feedback Overvoltage Lockout Measured at VFB l 0.64 0.66 0.68 V ISNSD+ SNSD+ Pin Bias Current VSNSD+ = 3.3V l 30 100 nA ISNSA+ SNSA+ Pin Bias Current VSNSA+ = 3.3V l 1 2 µA AVT_SNS Total Sense Signal Gain to (VSNSD+ + VSNSA+)/VSNSD+ 5 V/V Current Comparator VSENSE(MAX) Maximum Current Sense –40°C to 85°C Threshold VSNS– = 1.8V, ILIM = 0V l 9.2 10 10.8 mV ILIM = 1/4 VINTVCC l 14.2 15 15.8 mV ILIM = 1/2 VINTVCC or Float l 19.2 20 20.8 mV ILIM = 3/4 VINTVCC l 23.5 25 26.5 mV ILIM = VINTVCC l 28.5 30 31.5 mV –40°C to 125°C VSNS– = 1.8V, ILIM = 0V l 9 10 11 mV ILIM = 1/4VINTVCC l 14 15 16 mV ILIM = 1/2VINTVCC or Float l 19 20 21 mV ILIM = 3/4VINTVCC l 23.5 25 26.5 mV ILIM = VINTVCC l 28.5 30 31.5 mV ITEMP DCR Temperature VITEMP = 0.3V l 9 10 11 µA Compensation Current ITK/SS Soft-Start Charge Current VTK/SS = 0V l 1.0 1.25 1.5 µA VRUN RUN Pin On Threshold Voltage VRUN Rising l 1.1 1.22 1.35 V VRUN(HYS) RUN Pin On Hysteresis 80 mV Voltage TG Top Gate (TG) Transition Time tr Rise Time (Note 7) tf Fall Time CLOAD = 3300pF 25 ns CLOAD = 3300pF 25 ns BG Bottom Gate (BG) Transition tr Time (Note 7) tf Rise Time CLOAD = 3300pF 25 ns Fall Time CLOAD = 3300pF 25 ns 3866fc For more information www.linear.com/LTC3866 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts