Datasheet LT3579, LT3579-1 (Analog Devices) - 4

link to page 2 LT3579/LT3579-1
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 5V, VSHDN = VIN, VFAULT
=
VIN unless otherwise noted. (Note 2). PARAMETER CONDITIONS MIN TYP MAX UNITS
Soft-Start Charge Current VSS = 30mV, Current Flows Out of SS pin l 5.7 8.7 11.3 µA Soft-Start Discharge Current Part in FAULT VSS = 2.1V, l 5.7 8.7 11.3 µA Current Flows into SS Pin Soft-Start High Detection Voltage Part in FAULT l 1.65 1.8 1.95 V Soft-Start Low Detection Voltage Part Exiting FAULT l 30 50 85 mV SHDN Minimum Input Voltage High Active Mode, SHDN Rising l 1.27 1.33 1.41 V Active Mode, SHDN Falling l 1.24 1.3 1.38 V SHDN Input Voltage Low Shutdown Mode l .3 V SHDN Pin Bias Current VSHDN = 3V 40 60 µA VSHDN = 1.3V 9.5 11.4 13.4 µA VSHDN = 0V 0 0.1 µA CLKOUT Output Voltage High CCLKOUT = 50pF 1.9 2.1 2.3 V CLKOUT Output Voltage Low CCLKOUT = 50pF 100 200 mV CLKOUT Duty Cycle LT3579, TJ = 25°C 42 % LT3579-1, All TJ 50 % CLKOUT Rise Time CCLKOUT = 50pF 12 ns CLKOUT Fall Time CCLKOUT = 50pF 8 ns GATE Pull Down Current VGATE = 3V l 800 933 1100 µA VGATE = 80V l 800 933 1100 µA GATE Leakage Current VGATE = 50V, GATE Off 0.01 1 µA FAULT Output Voltage Low 50μA into FAULT Pin l 100 300 mV FAULT Leakage Current VFAULT = 40V, FAULT Off 0.01 1 µA FAULT Input Voltage Low Threshold l 700 750 800 mV FAULT Input Voltage High Threshold l 950 1000 1050 mV
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 3:
Current limit guaranteed by design and/or correlation to static test. may cause permanent damage to the device. Exposure to any Absolute
Note 4:
This IC includes overtemperature protection that is intended Maximum Rating condition for extended periods may affect device to protect the device during momentary overload conditions. Junction reliability and lifetime. temperature will exceed 125°C when overtemperature protection is active.
Note 2:
The LT3579E is guaranteed to meet performance specifications Continuous operation over the specified maximum operating junction from 0°C to 125°C junction temperature. Specifications over the –40°C temperature may impair device reliability. to 125°C operating junction temperature range are assured by design,
Note 5:
The UFD package switch VCESAT is guaranteed by design, characterization and correlation with statistical process controls. The characterization and bench correlation. LT3579I is guaranteed over the full –40°C to 125°C operating junction temperature range. Rev. B 4 For more information www.analog.com Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram State Diagram Operation Applications Information Appendix Typical Application Package Description Typical Application Related Parts Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram State Diagram Operation Applications Information Appendix Typical Application Package Description Revision History Typical Application Related Parts