Datasheet LT8303 (Analog Devices) - 3

LT8303
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 unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNIT
VIN Input Voltage Range 5.5 100 V VIN UVLO Threshold Rising 5.3 5.5 V Falling 3.2 V IQ VIN Quiescent Current VEN/UVLO = 0.3V 1.5 2.5 µA VEN/UVLO = 1.1V 200 µA Sleep Mode (Switch Off) 70 µA Active Mode (Switch On) 280 µA EN/UVLO Shutdown Threshold For Lowest Off IQ l 0.3 0.75 V EN/UVLO Enable Threshold Falling l 1.186 1.223 1.284 V Hysteresis 0.016 V IHYS EN/UVLO Hysteresis Current VEN/UVLO = 0.3V –0.1 0 0.1 µA VEN/UVLO = 1.1V 2.1 2.5 2.9 µA VEN/UVLO = 1.3V –0.1 0 0.1 µA fMAX Maximum Switching Frequency 320 350 380 kHz fMIN Minimum Switching Frequency 5 7 9 kHz tON(MIN) Minimum Switch-On Time 160 ns tOFF(MIN) Minimum Switch-Off Time VIN = VEN/UVLO = 12V 350 ns tOFF(MAX) Maximum Switch-Off Time Backup Timer 200 µs ISW(MAX) Maximum SW Current Limit 450 535 620 mA ISW(MIN) Minimum SW Current Limit 70 105 140 mA SW Over Current Limit To Initiate Soft-Start 1 A RDS(ON) Switch On-Resistance ISW = 100mA 3.2 Ω ILKG Switch Leakage Current VIN = 100V, VSW = 150V 0.1 0.5 µA IRFB RFB Regulation Current l 97.5 100 102.5 µA RFB Regulation Current Line Regulation 5.5V ≤ VIN ≤ 100V 0.001 0.01 %/V
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings design, characterization and correlation with statistical process controls. may cause permanent damage to the device. Exposure to any Absolute The LT8303I is guaranteed over the full –40°C to 125°C operating junction Maximum Rating condition for extended periods may affect device temperature range. The LT8303H is guaranteed over the full –40°C to reliability and lifetime. 150°C operating junction temperature range. High junction temperatures
Note 2:
The SW pin is rated to 150V for transients. Depending on the degrade operating lifetimes. Operating lifetime is derated at junction leakage inductance voltage spike, operating waveforms of the SW pin temperatures greater than 125°C. should be derated to keep the flyback voltage spike below 150V as shown
Note 4:
The LT8303 includes overtemperature protection that is intended in Figure 5. to protect the device during momentary overload conditions. Junction
Note 3:
The LT8303E is guaranteed to meet performance specifications temperature will exceed 150°C when overtemperature protection is active. from 0°C to 125°C operating junction temperature. Specifications over Continuous operation above the specified maximum operating junction the –40°C to 125°C operating junction temperature range are assured by temperature may impair device reliability. 8303fa For more information www.linear.com/LT8303 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 Typical Applications Package Description Typical Application Related Parts