Datasheet LT8495 (Analog Devices) - 4

LT8495
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25°C. VIN = VSWEN = 12V, VBIAS = VWDE = 5V, unless otherwise noted (Note 2). PARAMETER CONDITIONS MIN TYP MAX UNITS
RSTIN Pin Current (Note 7) VRSTIN = 1.2V 0 25 nA VRSTIN = 5V 35 200 nA VRSTIN = 12V 240 550 nA RSTIN Threshold as % of VFB Regulation Voltage l 86 92 97 % RSTIN Low to RST Asserted (tUV) Step VRSTIN from 1.3V to 0.9V l 8 23 60 µs Watchdog Timeout and Reset Delay Period (tRST) CPOR = 4700pF, Watchdog Timeout Not Occurring l 8.5 9.5 11.85 ms (Note 8) at Same Time as the Reset Delay Watchdog Upper Boundary (tWDU) (Note 8) CWDT = 1000pF l 14.9 16.7 20.9 ms Watchdog Lower Boundary (tWDL) (Note 8) CWDT = 1000pF l 580 650 812 µs RST Output Voltage Low ISINK = 1.25mA l 33 150 mV ISINK = 100μA, VBIAS = 1.3V, VIN = 0V l 15 150 mV ISINK = 100μA, VIN = 1.3V, VBIAS = 0V l 15 150 mV RST Leakage Current VRSTIN = 1.2V, VRST = 5V (LT8495E, LT8495I) l 0 0.3 µA VRSTIN = 1.2V, VRST = 5V (LT8495H) l 0 1.0 μA WDO Output Voltage Low ISINK = 1.25mA l 120 420 mV WDO Leakage Current VWDO = 5V l 0 0.25 μA WDI Pin Current VWDI = 5V 0 0.1 µA WDI Input Rising Threshold l 0.4 0.8 1.25 V WDI Voltage Hysteresis 58 mV WDI Input Pulse Width l 300 ns WDE Pin Current (Note 7) VWDE = 1.2V 0 25 nA VWDE = 5V 35 200 nA VWDE = 12V 240 550 nA WDE Rising Voltage Threshold l 0.9 1 1.1 V WDE Voltage Hysteresis 30 mV
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings overtemperature protection is active. Continuous operation above the may cause permanent damage to the device. Exposure to any Absolute specified maximum operating junction temperature may impair device Maximum Rating condition for extended periods may affect device reliability. reliability and lifetime. Voltages are with respect to GND pin unless
Note 4:
See Power Supplies and Operating Limits in the Applications otherwise noted. Information section for more details.
Note 2:
The LT8495E is guaranteed to meet performance specifications
Note 5:
Current limit guaranteed by design and/or correlation to static test. from 0°C to 125°C junction temperature. Specifications over the –40°C Slope Compensation reduces current limit at higher duty cycles. to 125°C operating junction temperature range are assured by design,
Note 6:
Max duty cycle current limit measured at 1MHz switching characterization and correlation with statistical process controls. The frequency. LT8495I is guaranteed to meet performance specifications from –40°C to 125°C junction temperature. The LT8495H is guaranteed over the full
Note 7:
Polarity specification for all currents into pins is positive. All –40°C to 150°C operating junction temperature range. Operating lifetime is voltages are referenced to GND unless otherwise specified. derated at junction temperatures greater than 125°C.
Note 8:
This specification is guaranteed for only the exact capacitance as
Note 3:
This IC includes overtemperature protection that is intended listed in the conditions. Variation of the capacitance from the exact listed to protect the device during momentary overload conditions. value will cause proportional variation to tRST, tWDU and tWDL. Junction temperature will exceed the maximum operating range when 8495fb 4 For more information www.linear.com/LT8495 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Timing Diagrams Operation Applications Information Typical Applications Package Description Revision History Typical Applications Related Parts