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LT3477 Datasheet(PDF) 3 Page - Linear Technology |
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LT3477 Datasheet(HTML) 3 Page - Linear Technology |
3 / 20 page 3 LT3477 3477fb PARAMETER CONDITIONS MIN TYP MAX UNITS Soft-Start Pin Current SS = 0.5V, Out of Pin 9 µA FBP Pin Bias Current 25 100 nA FBN Pin Bias Current 25 100 nA Feedback Amplifier Offset Voltage FBP – FBN, VC = 1V –2 2 6 mV Feedback Amplifier Voltage Gain 500 V/V Voltage Feedback Amplifier Transconductance 500 µS Feedback Amplifier Sink Current VFBP = 1.25V, VFBN = 1.5V, VC = 1V 10 µA Feedback Amplifier Source Current VFBP = 1.25V, VFBN = 1V, VC = 0.5V 10 µA Current Sense Amplifier Sense Voltage Positive Rail, VCM = 25V, E Grade ● 97.5 100 102.5 mV Positive Rail, VCM = 25V, I Grade ● 97.5 100 103 mV Ground 88 100 112 mV Switching Frequency RT = 17.2k 0.9 1 1.15 MHz RT = 107.4k 160 200 240 kHz RT = 2.44k 2.7 3.5 4.3 MHz Maximum Switch Duty Cycle RT = 17.2k ● 87 93 % Switch Current Limit (Note 3) 3 4 5 A Switch VCESAT ISW = 1A (Note 3) 150 200 mV Switch Leakage Current SW = 40V 0.2 5 µA SHDN Pin Current VSHDN = 5V 30 60 µA VSHDN = 0V 0.1 1 µA SHDN Pin Threshold 0.3 1.5 2 V The ● indicates specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 2.5V, VSHDN = 2.5V. ELECTRICAL CHARACTERISTICS Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LT3477E is guaranteed to meet performance specifications from 0 °C to 70°C. Specifications over the –40°C to 85°C operating TYPICAL PERFOR A CE CHARACTERISTICS Switch VCE(SAT) Switch Current Limit VREF junction temperature range are assured by design, characterization and correlation with statistical process controls. The LT3477I is guaranteed over the full –40 °C to 125°C operating junction temperature range. Note 3: Switch current limit and switch VCESAT for UF package guaranteed by design and/or correlation to static test. SWITCH CURRENT (A) 0 0 0.10 0.20 0.30 0.25 0.5 1 1.5 2 3477 G01 2.5 0.40 0.50 0.05 0.15 125 °C –50 °C 0.35 0.45 3 25 °C TEMPERATURE ( °C) –50 –25 0 2 5 0 50 75 3477 G02 1 4 3 25 100 125 TEMPERATURE ( °C) –50 1.21 1.22 1.23 1.24 1.25 050 100 150 3477 G03 1.26 1.27 –25 25 75 125 VIN = 25V VIN = 2.5V |
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