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LT3973 Datasheet(PDF) 4 Page - Linear Technology |
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LT3973 Datasheet(HTML) 4 Page - Linear Technology |
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4 / 24 page  LT3973/LT3973-3.3/LT3973-5 4 3973fb For more information www.linear.com/LT3973 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 LT3973E is guaranteed to meet performance specifications from 0°C to 125°C junction temperature. Specifications over the –40°C to 125°C operating junction temperature range are assured by design, characterization, and correlation with statistical process controls. The LT3973I is guaranteed over the full –40°C to 125°C operating junction temperature range. The LT3973H is guaranteed over the full –40°C to 150°C operating junction temperature range. High junction temperatures degrade operating lifetimes. Operating lifetime is derated at junction temperatures greater than 125°C. The junction temperature (TJ, in °C) is calculated from the ambient temperature (TA in °C) and power dissipation (PD, in Watts) according to the formula: TJ = TA + (PD • θJA) where θJA (in °C/W) is the package thermal impedance. Note 3: This is the minimum input voltage for operation with accurate FB reference voltage. Note 4: This is the minimum voltage across the boost capacitor needed to guarantee full saturation of the switch. Note 5: The LT3973 contains circuitry that extends the maximum duty cycle if there is sufficient voltage across the boost capacitor. See the Application Information section for more details. Note 6: This IC includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature will exceed the maximum operating junction temperature when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature may impair device reliability or permanently damage the device. EN/UVLO Pin Current VEN/UVLO = 12V 1 30 nA EN/UVLO Voltage Threshold EN/UVLO Falling, VIN ≥ 4.2V l 1.09 1.16 1.23 V EN/UVLO Voltage Threshold EN/UVLO Rising, VIN ≥ 4.2V l 1.12 1.19 1.28 V EN/UVLO Voltage Hysteresis 30 45 mV PG Threshold Offset from Feedback Voltage VFB Rising 6.5 10 13.5 % PG Hysteresis as % of Output Voltage 0.8 % PG Leakage VPG = 3V 0.01 1 µA PG Sink Current VPG = 0.4V l 220 350 µA Minimum Switch On-Time 70 ns Minimum Switch Off-Time (Note 5) VIN = 10V 130 180 ns ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VBD = 3.3V unless otherwise noted. (Note 2) |
Similar Part No. - LT3973_15 |
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Similar Description - LT3973_15 |
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