Datasheet LT8302, LT8302-3 (Analog Devices) - 3

link to page 2 link to page 16 LT8302/LT8302-3
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 5V, VEN/UVLO = VIN, CINTVCC = 1µF to GND, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNIT
VIN VIN Voltage Range l 3 42 V IQ VIN Quiescent Current VEN/UVLO = 0.2V 0.5 2 µA VEN/UVLO = 1.1V 53 µA Sleep Mode (Switch Off) 106 µA Active Mode (Switch On) 380 µA EN/UVLO Shutdown Threshold For Lowest Off IQ l 0.2 0.75 V EN/UVLO Enable Threshold Falling (E, I, H, MP Grades) l 1.178 1.214 1.250 V EN/UVLO Enable Threshold Falling (J Grade Only) l 1.160 1.214 1.268 V EN/UVLO Enable Hysteresis 14 mV IHYS EN/UVLO Hysteresis Current VEN/UVLO = 0.3V –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 2.85 3 3.1 V IINTVCC INTVCC Current Limit VINTVCC = 2.8V 10 13 20 mA INTVCC UVLO Threshold Falling 2.39 2.47 2.55 V INTVCC UVLO Hysteresis 105 mV (RFB – VIN) Voltage IRFB = 75µA to 125µA –50 50 mV RREF Regulation Voltage l 0.98 1.00 1.02 V RREF Regulation Voltage Line Regulation 3V ≤ VIN ≤ 42V –0.01 0 0.01 %/V VTC TC Pin Voltage 1.00 V ITC TC Pin Current VTC = 1.2V (LT8302) 12 15 18 µA VTC = 1.2V (LT8302-3) 7 10 13 µA VTC = 0.8V –200 µA fMIN Minimum Switching Frequency 11.3 12 12.7 kHz tON(MIN) Minimum Switch-On Time 160 ns tOFF(MAX) Maximum Switch-Off Time Backup Timer 170 µs ISW(MAX) Maximum Switch Current Limit 3.6 4.5 5.4 A ISW(MIN) Minimum Switch Current Limit 0.70 0.87 1.04 A RDS(ON) Switch On-Resistance ISW = 1.5A 80 mΩ ILKG Switch Leakage Current VSW = 65V 0.1 0.5 µA tSS Soft-Start Timer 11 ms
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings controls. The LT8302I/LT8302I-3 is guaranteed over the full –40°C to may cause permanent damage to the device. Exposure to any Absolute 125°C operating junction temperature range. The LT8302J/LT8302J-3 Maximum Rating condition for extended periods may affect device and LT8302H/LT8302H-3 are guaranteed over the full –40°C to 150°C reliability and lifetime. operating junction temperature range. The LT8302MP is guaranteed
Note 2:
The SW pin is rated to 65V for transients. Depending on the over the full –55°C to 150°C operating junction temperature range. High leakage inductance voltage spike, operating waveforms of the SW pin junction temperatures degrade operating lifetimes. Operating lifetime is should be derated to keep the flyback voltage spike below 65V as shown derated at junction temperature greater than 125°C. in Figure 5.
Note 4:
The LT8302/LT8302-3 includes overtemperature protection that
Note 3:
The LT8302E/LT8302E-3 is guaranteed to meet performance is intended to protect the devices during momentary overload conditions. specifications from 0°C to 125°C junction temperature. Specifications Junction temperature will exceed 150°C when overtemperature protection over the –40°C to 125°C operating junction temperature range are is active. Continuous operation above the specified maximum operating assured by design, characterization and correlation with statistical process junction temperature may impair device reliability. Rev. G For more information www.analog.com 3 Document Outline 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