Datasheet LT8304, LT8304-1 (Analog Devices) - 3

LT8304/LT8304-1
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 24V, VEN/UVLO = VIN, CINTVCC = 1µF to GND, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNIT
VIN VIN Voltage Range l 3 100 V IQ VIN Quiescent Current VEN/UVLO = 0.2V 1.8 3 µA VEN/UVLO = 1.1V 63 µA Sleep Mode (Switch Off) 116 µA Active Mode (Switch On) 390 µA EN/UVLO Shutdown Threshold For Lowest Off IQ l 0.2 0.5 V EN/UVLO Enable Threshold Falling l 1.178 1.214 1.250 V EN/UVLO Enable Hysteresis 14 mV IHYS EN/UVLO Hysteresis Current VEN/UVLO = 0.2V –0.1 0 0.1 µA VEN/UVLO = 1.1V 2.3 2.5 2.7 µA VEN/UVLO = 1.3V –0.1 0 0.1 µA VINTVCC INTVCC Regulation Voltage IINTVCC = 0mA to 10mA 2.8 3 3.1 V IINTVCC INTVCC Current Limit VINTVCC = 2.8V 16 mA INTVCC UVLO Threshold Falling 2.38 2.47 2.56 V INTVCC UVLO Hysteresis 105 mV (RFB – VIN) Voltage IRFB = 75µA to 125µA –60 60 mV RREF Regulation Voltage l 0.98 1.00 1.02 V RREF Regulation Voltage Line Regulation 3V ≤ VIN ≤ 100V 0.02 0.1 % VTC TC Pin Voltage 1.00 V ITC TC Pin Current VTC = 1.2V (LT8304) 12 15 18 µA VTC = 1.2V (LT8304-1) 7 10 13 µA VTC = 0.8V –200 µA fMAX Maximum Switching Frequency l 315 350 385 kHz fMIN Minimum Switching Frequency 8 11 14 kHz tON(MIN) Minimum Switch-On Time (LT8304) 160 ns (LT8304-1) 950 ns ISW(MAX) Maximum Switch Current Limit 2.0 2.4 2.8 A ISW(MIN) Minimum Switch Current Limit 0.43 0.48 0.53 A RDS(ON) Switch On-Resistance ISW = 0.8A 0.5 Ω ILKG Switch Leakage Current VSW = 150V 0.1 0.5 µA tSS Soft-Start Timer 11 ms
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings The LT8304I/LT8304I-1 are guaranteed over the full –40°C to 125°C may cause permanent damage to the device. Exposure to any Absolute operating junction temperature range. LT8304H/LT304H-1 are guaranteed Maximum Rating condition for extended periods may affect device over the full –40°C to 150°C operating junction temperature range. High reliability and lifetime. junction temperatures degrade operating lifetimes. Operating lifetime is
Note 2:
The SW pin is rated to 150V for transients. Depending on the derated at junction temperature greater than 125°C. leakage inductance voltage spike, operating waveforms of the SW pin
Note 4:
The LT8304/LT8304-1 includes overtemperature protection that should be derated to keep the flyback voltage spike below 150V as shown is intended to protect the device during momentary overload conditions. in Figure 5. Junction temperature will exceed 150°C when overtemperature protection
Note 3:
The LT8304E/LT8304E-1 are guaranteed to meet performance is active. Continuous operation above the specified maximum operating specifications from 0°C to 125°C junction temperature. Specifications over junction temperature may impair device reliability. the –40°C to 125°C operating junction temperature range are assured by design, characterization and correlation with statistical process controls. 8304fa For more information www.linear.com/LT8304 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Typical Application Related Parts Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts