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LT3507 Datasheet(PDF) 3 Page - Linear Technology |
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LT3507 Datasheet(HTML) 3 Page - Linear Technology |
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3 / 28 page  LT3507 3 3507f ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN1, VIN2, VIN3 = 12V, VBOOST1, VBOOST2, VBOOST3 = 17V, unless otherwise noted. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS VC Source Current VC = 0.6V 100 μA VC Sink Current VC = 0.6V 100 μA VC Clamp Voltage 1.7 V Switching Frequency RT = 40.2k l 0.9 1.1 MHz Switching Phase SW1 to SW2,3, RT = 40.2k 180 Deg Foldback Frequency VFB = 0V, RT = 40.2k 120 kHz Frequency Shift Threshold on FB 0.4 V RUN Threshold 1 1.5 V PGOOD Output Voltage Low IPGOOD = 200μA 0.2 0.4 V PGOOD Pin Leakage VPGOOD = 2V 10 400 nA PGOOD Threshold Offset VFB Rising 58 80 105 mV Feedback Pin Voltage l 788 800 812 mV Feedback Pin Bias Current l –50 –500 nA Error Amplifier Transconductance 330 μS Error Amplifier Voltage Gain 500 V/V VC Switching Threshold 0.9 V Switch Leakage Current 0.01 10 μA Minimum Boost Voltage Above Switch (Note 4) 1.8 2.5 V Converter 1 VC1 to Switch Current Gain 5A/V Switch 1 Current Limit (Note 3) Duty Cycle = 15% l 3 4.3 6 A Switch 1 VCESAT ISW1 = 2A 400 600 mV BOOST1 Operating Current ISW1 = 2A 40 60 mA Converter 2 VC2 to Switch Current Gain 3.6 A/V Switch 2 Current Limit (Note 3) Duty Cycle = 15% l 2 2.9 4 A Switch 2 VCESAT ISW2 = 1.5A 350 500 mV BOOST2 Operating Current ISW2 = 1.5A 40 60 mA Converter 3 VC3 to Switch Current Gain 3.6 A/V Switch 3 Current Limit (Note 3) Duty Cycle = 15% l 2 2.9 4 A Switch 3 VCESAT ISW3 = 1.5A 350 500 mV BOOST3 Operating Current ISW3 = 1.5A 40 60 mA LDO Regulator Feedback Pin Voltage l 788 800 812 mV Feedback Pin Bias Current –150 –500 nA Error Amplifier Voltage Gain 1100 V/V Line Regulation VIN from 5V to 36V 0.05 %/V |
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