Datasheet LT3689, LT3689-5 (Analog Devices) - 3

LT3689/LT3689-5
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VOUT = 5V, unless otherwise noted. (Note 3) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Fixed Undervoltage Lockout l 3.4 3.7 V VIN Overvoltage Lockout l 36 38 40 V Quiescent Current from VIN VEN/UVLO = 0.3V 0.01 0.5 µA VOUT = 3V, Not Switching l 50 95 µA VOUT = 0V, Not Switching 125 175 µA Quiescent Current from OUT VEN/UVLO = 0.3V 0.01 0.5 µA VOUT = 3V, Not Switching (Note 7) l 75 150 µA VOUT = 0V, Not Switching –5 –20 µA LT3689-5 Quiescent Current from VIN VEN/UVLO = 0.3V 0.01 0.5 µA VOUT = 5.5V (Note 8) l 50 95 µA VOUT = 0V 125 175 µA LT3689-5 Quiescent Current from OUT VEN/UVLO = 0.3V 8 16 µA VOUT = 5.5V l 95 150 µA LT3689 FB Voltage 0.790 0.800 0.812 V l 0.780 0.812 V LT3689-5 Output Voltage 4.950 5.000 5.050 V l 4.900 5.100 V LT3689 FB Pin Bias Current VFB = 0.800V l –30 –100 nA LT3689 FB Voltage Line Regulation 5V < VIN < 36V 0.005 %/V LT3689-5 Output Voltage Line Regulation 5.5V < VIN < 36V 0.005 %/V fSW Switching Frequency RT = 4.02k l 1.8 2 2.2 MHz RT = 31.62k l 420 500 540 kHz tSW(OFF) Switch Off-Time 120 160 ns Foldback Frequency RT = 4.02k, VFB = 0V 250 kHz Switch Current Limit (Note 4) l 1.15 1.55 1.95 A Switch VCESAT ISW = 0.8A 450 mV Switch Leakage Current 0.01 1 µA DA Current Limit 0.85 1.2 1.5 A Boost Schottky Reverse Leakage VBST = 12V, VOUT = 0V 0.1 5 µA Minimum BST Above SW Voltage 1.8 2.5 V BST Pin Current ISW = 0.8A 15 25 mA EN/UVLO Threshold Voltage 1.150 1.260 1.350 V EN/UVLO Pin Current VEN/UVLO = 1.35V 0. 01 1 µA VEN/UVLO = 1.15V 2.5 4.1 5.5 µA EN/UVLO Pin Current Hysteresis I(VEN/UVLO = 1.15V) – I(VEN/UVLO = 1.35V) 2.8 3.8 4.8 µA SYNC Threshold Voltage 0.4 0.8 1 V VRST Reset Threshold as % of VFB l 88 90 92 % tRST Reset Timeout Period CPOR = 8200pF l 17 19 21 ms tWDU Watchdog Upper Boundary CWDT = 1000pF l 17 19 21 ms tWDL Watchdog Lower Boundary CWDT = 1000pF l 610 675 785 µs VOL RST, WDO Output Voltage Low ISINK = 2.5mA l 0.15 0.4 V ISINK = 100µA l 0.05 0.3 V VOH RST, WDO Output Voltage High (Note 6) l VOUT –1 V 3689fe For more information www.linear.com/LT3689 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Timing Diagrams Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts