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LT3689 Datasheet(PDF) 3 Page - Linear Technology |
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LT3689 Datasheet(HTML) 3 Page - Linear Technology |
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3 / 32 page  LT3689/LT3689-5 3 3689fa ELECTRICAL CHARACTERISTICS 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 VOUT = 3V, Not Switching VOUT = 0V, Not Switching l 0.01 50 125 0.5 95 175 μA μA μA Quiescent Current from OUT VEN/UVLO = 0.3V VOUT = 3V, Not Switching (Note 7) VOUT = 0V, Not Switching l 0.01 75 –5 0.5 150 –20 μA μA μA LT3689-5 Quiescent Current from VIN VEN/UVLO = 0.3V VOUT = 5.5V (Note 8) VOUT = 0V l 0.01 50 125 0.5 95 175 μA μA μA LT3689-5 Quiescent Current from OUT VEN/UVLO = 0.3V VOUT = 5.5V l 8 95 16 150 μA μA LT3689 FB Voltage l 0.790 0.780 0.800 0.812 0.812 V V LT3689-5 Output Voltage l 4.950 4.900 5.000 5.050 5.100 V 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 RT = 31.62k l l 1.84 420 2 500 2.16 540 MHz kHz tSW(OFF) Switch Off-Time VBST = 12V 120 160 ns Foldback Frequency RT = 4.22k, VOUT = 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 VEN/UVLO = 1.15V 2.5 0. 01 4.1 1 5.5 μA μA EN/UVLO Pin Current Hysteresis I(VEN/UVLO = 1.35V) – I(VEN/UVLO = 1.15V) 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, VOUT = 0V ISINK = 100μA, VOUT = 0V l l 0.15 0.05 0.4 0.3 V V VOH RST, WDO Output Voltage High (Note 6) l VOUT –1 V 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) |
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