Datasheet LT8570, LT8570-1 (Analog Devices) - 3

LT8570/LT8570-1
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 unless otherwise noted. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS
Operating Voltage Range –40°C to 125°C l 2.55 40 V –40°C to 150°C 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 2.55V ≤ 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 3/4 fSYNC/fOSC Minimum Off-Time 100 ns Minimum On-Time 100 ns Switch Current Limit Minimum Duty Cycle (Note 3), LT8570 l 0.6 0.75 1 A Maximum Duty Cycle (Notes 3, 4), LT8570, fOSC = 1.5MHz l 0.27 0.5 0.85 A Maximum Duty Cycle (Notes 3, 4), LT8570, fOSC = 200kHz l 0.15 0.4 0.8 A Minimum Duty Cycle (Note 3), LT8570-1 l 0.3 0.375 0.5 A Maximum Duty Cycle (Notes 3, 4), LT8570-1, fOSC = 1.5MHz l 0.15 0.25 0.43 A Maximum Duty Cycle (Notes 3, 4), LT8570-1, fOSC = 200kHz l 0.075 0.2 0.4 A Switch VCESAT ISW = 0.4A (LT8570) 250 mV ISW = 0.2A (LT8570-1) 250 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 Minimum Input Voltage Hysteresis 40 mV 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
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings the full –40°C to 150°C operating junction temperature range. Operating may cause permanent damage to the device. Exposure to any Absolute lifetime is derated at junction temperatures greater than 125°C. Maximum Rating condition for extended periods may affect device
Note 3:
Current limit guaranteed by design and/or correlation to static test. reliability and lifetime.
Note 4:
Current limit measured at equivalent of listed switching frequency.
Note 2:
The LT8570E/LT8570-1E are guaranteed to meet performance
Note 5:
This IC includes overtemperature protection that is intended specifications from 0°C to 125°C junction temperature. Specifications over to protect the device during momentary overload conditions. Junction the –40°C to 125°C operating junction temperature range are assured by temperature will exceed 150°C when overtemperature protection is active. design, characterization and correlation with statistical process controls. The Continuous operation above the specified maximum operating junction LT8570I/LT8570-1I are guaranteed over the full –40°C to 125°C operating temperature may impair device reliability. junction temperature range. The LT8570H/LT8570-1H are guaranteed over 85701fa For more information www.linear.com/LT8570 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts