Datasheet LT8580 (Analog Devices) - 3

LT8580
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 unless otherwise noted. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS
Operating Voltage Range LT8580E, LT8580I l 2.55 40 V LT8580H l 2.9 40 V Positive Feedback Voltage l 1.185 1.204 1.220 V Negative Feedback Voltage l –3 3 12 mV Positive FBX Pin Bias Current VFBX = Positive Feedback Voltage, Current Into Pin l 81 83.3 85 µA Negative FBX Pin Bias Current VFBX = Negative Feedback Voltage, Current Out of Pin l 81 83.3 86 µA Error Amplifier Transconductance 200 µmhos Error Amplifier Voltage Gain 60 V/V Quiescent Current VSHDN = 2.5V, Not Switching 1.2 1.7 mA Quiescent Current in Shutdown VSHDN = 0V 0 1 µA Reference Line Regulation 2.5V ≤ VIN ≤ 40V 0.01 0.05 %/V Switching Frequency, fOSC RT = 56.2k l 1.23 1.5 1.77 MHz RT = 422k l 165 200 235 kHz Switching Frequency in Foldback Compared to Normal fOSC 1/6 Ratio Switching Frequency Set Range SYNCing or Free Running l 200 1500 kHz SYNC High Level for Synchronization l 1.3 V SYNC Low Level for Synchronization l 0.4 V SYNC Clock Pulse Duty Cycle VSYNC = 0V to 2V 35 65 % Recommended Minimum SYNC Ratio fSYNC/fOSC 3/4 Minimum Off-Time 100 ns Minimum On-Time 120 ns Switch Current Limit Minimum Duty Cycle (Note 3) l 1.2 1.5 1.8 A Maximum Duty Cycle (Notes 3, 4), fOSC = 1.5MHz l 0.6 1 1.5 A Maximum Duty Cycle (Notes 3, 4), fOSC = 200kHz l 0.4 0.8 1.4 A Switch VCESAT ISW = 0.75A 400 mV Switch Leakage Current VSW = 5V 0.01 1 µA Soft-Start Charging Current VSS = 0.5V l 4 6 8 µA SHDN Minimum Input Active Mode, SHDN Rising l 1.23 1.31 1.4 V Voltage High Active Mode, SHDN Falling l 1.21 1.27 1.33 V SHDN Input Voltage Low Shutdown Mode l 0.3 V SHDN Pin Bias Current VSHDN = 3V 44 56 µA VSHDN = 1.3V 9 12 15 µA VSHDN = 0V 0 0.1 µA SHDN Hysteresis 40 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:
Current limit measured at equivalent of listed switching frequency. Maximum Rating condition for extended periods may affect device
Note 5:
This IC includes overtemperature protection that is intended reliability and lifetime. to protect the device during momentary overload conditions. Junction
Note 2:
The LT8580E is guaranteed to meet performance specifications temperature will exceed 150°C when overtemperature protection is active. from 0°C to 125°C junction temperature. Specifications over the –40°C Continuous operation above the specified maximum operating junction to 125°C operating junction temperature range are assured by design, temperature may impair device reliability. characterization and correlation with statistical process controls. The LT8580I is guaranteed over the full –40°C to 125°C operating junction temperature range. The LT8580H is guaranteed over the full –40°C to 150°C operating junction temperature range. Operating lifetime is derated at junction temperatures greater than 125°C. Rev. B For more information www.analog.com 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts