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LT3640 Datasheet(PDF) 3 Page - Linear Technology |
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LT3640 Datasheet(HTML) 3 Page - Linear Technology |
3 / 24 page LT3640 3640f The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VIN2 = 3.3V, EN/UVLO = 12V, EN2 = 3.3V, unless otherwise noted. elecTrical characTerisTics PARAMETER CONDITIONS MIN TYP MAX UNITS VIN Undervoltage Lockout Threshold l 3.6 4 V VIN Undervoltage Release Threshold l 3.8 4.2 V VIN Overvoltage Lockout Threshold l 35 36.5 38 V VIN Overvoltage Release Threshold l 34 35.5 37 V Quiescent Current from VIN EN/UVLO = 0.3V Not Switching 0.1 275 1 375 µA µA EN/UVLO Threshold Voltage 1.2 1.26 1.3 V EN/UVLO High Bias Current EN/UVLO = Threshold + 60mV 2 µA EN/UVLO Low Bias Current EN/UVLO = Threshold – 60mV 0.1 µA SYNC Input Frequency 0.35 2.5 MHz SYNC Threshold Voltage 0.4 0.8 1 V Switching Frequency RT = 32.4k RT = 182k l l 1.75 450 2 500 2.35 550 MHz kHz FB1 Voltage l 1.24 1.265 1.29 V FB1 Bias Current FB1 = 1.265V 30 100 nA FB1 Line Regulation 5V < VIN < 30V 0.001 %/V SW1 Minimum Off-Time 70 100 ns SW1 VCESAT ISW1 = 800mA 400 mV SW1 Leakage Current 0.1 1 µA SW1 Current Limit FB1 = 1V (Note 3) FB1 = 0.1V l 2.2 2.8 1.8 3.4 A A DA Current limit FB1 = 1V (Note 4) FB1 = 0.1V l 1.35 1.7 1 2.2 A A BST Pin Current ISW1 = 800mA 30 50 mA Minimum BST-SW Voltage 2 2.7 V ΔFB1 to Start LV Channel 80 100 130 mV ΔFB1 Hysteresis to Stop LV Channel 30 50 90 mV VIN2 Minimum Operating Voltage l 2.3 2.5 V VIN2 Maximum Operating Voltage l 5.5 V EN2 Threshold Voltage 0.3 1 1.5 V FB2 Voltage l 588 600 612 mV FB2 Bias Current FB2 = 0.6V 0 100 nA FB2 Line Regulation 2.5V < VIN2 < 5.5V 0.01 %/V SW2 Minimum Off-Time 70 100 ns SW2 PMOS Current Limit (Note 5) l 1.5 1.9 2.2 A SW2 NMOS Current Limit (Note 5) l 1.2 1.6 2 A SW2 PMOS RDS(ON) ISW2 = 0.5A (Note 6) 275 mΩ SW2 NMOS RDS(ON) ISW2 = 0.5A (Note 6) 200 mΩ ΔFB2 to Enable PGOOD 20 40 80 mV ΔFB2 Hysteresis to Disable PGOOD 20 40 80 mV PGOOD Voltage FB2 = 0.6V, IPGOOD = 1mA 200 320 mV |
Similar Part No. - LT3640_15 |
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Similar Description - LT3640_15 |
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