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LT3480 Datasheet(PDF) 3 Page - Linear Technology |
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LT3480 Datasheet(HTML) 3 Page - Linear Technology |
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3 / 24 page  LT3645 3 3645f ELECTRICAL CHARACTERISTICS PARAMETER CONDITIONS MIN TYP MAX UNITS Undervoltage Lockout on VIN Rising l 3 3.4 3.6 V Overvoltage Lockout on VIN Rising l 36 38.5 40 V Overvoltage Lockout Hysteresis 1V Feedback Voltage FB l 0.79 0.785 0.8 0.8 0.81 0.813 V FB Pin Bias Current l 20 300 nA Feedback Voltage Line Regulation l 0.015 %/V VIN Quiescent Current Not Switching 1.4 3 mA VIN Quiescent Current in Shutdown VEN/UVLO = 0.3V, VCC2 = 0V, VOUT2 = 0V 0.01 2 μA Switching Frequency 675 750 825 kHz Maximum Duty Cycle 100mA Load l 83 87 % Switch Current Limit Rising (Note 4) 0.8 1 1.25 A DA Pin Current to Stop Osc 0.6 1 1.25 A Switch VCESAT ISW = 500mA 400 mV Switch Leakage Current 2μA Minimum Boost Voltage Above Switch ISW = 500mA 1.6 2.2 V BOOST Pin Current ISW = 500mA 10 18 mA BOOST Schottky Forward Drop IOUT = 50mA 0.7 0.9 V EN/UVLO Threshold High Rising 1.17 1.23 1.29 V EN/UVLO Threshold Hysteresis 50 mV EN/UVLO Input Current VEN/UVLO = 5V VEN/UVLO = 0V 25 50 1 μA μA Buck Soft-Start Time 0.9 1.8 ms LDO Minimum Input Voltage VCC2 ILOAD = 200mA, VOUT2 = 0.8V, VIN = 4.0V 1.1 1.38 V LDO Feedback Voltage FB2 l 782 797 810 mV LDO FB2 Bias Current l 20 300 nA LDO Line Regulation 0.020 %/V LDO Load Regulation –1 mV LDO Dropout Voltage (VCC2 to VOUT2)ILOAD = 10mA ILOAD = 10mA ILOAD = 200mA l 45 310 65 145 mV mV mV LDO Dropout Voltage (VIN to VOUT2)ILOAD = 200mA ILOAD = 200mA l 1.1 1.4 1.7 V V LDO Current Limit l 210 270 mA mA EN2 Pin Threshold Rising Falling l l 0.5 1.3 0.8 1.6 V V LDO Soft-Start Time 0.6 1.2 ms NPG VCESAT INPG = 1mA, VFB = VFB2 = 850mV 0.4 V NPG Leakage VNPG = 16V, VFB = VFB2 = 750mV 0.5 μA FB2 NPG Threshold, % of Regulation Voltage VFB = 800mV, VFB2 Rising 88 90 92 % The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, BOOST = 15.3V, VCC2 = 3.3V, OUT2 = 1.8V unless otherwise noted. (Notes 2, 3) |
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