Datasheet LT3686A (Analog Devices) - 3

LT3686A
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denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 10V, VEN/UVLO ≥ 1.34V. PARAMETER CONDITIONS MIN TYP MAX UNITS
Quiescent Current at Shutdown VEN/UVLO < 0.4V 0.1 1 µA VEN/UVLO = 1V 10 15 µA Quiescent Current Not Switching, SYNC/MODE ≤ 0.4V 1.1 1.3 mA Not Switching, SYNC/MODE ≥ 0.8V 1.2 1.4 mA Internal Undervoltage Lockout 3.4 3.6 V Overvoltage Lockout ● 37 38 39 V Feedback Voltage VIN = 3.6V ↔ 37V 0.790 0.8 0.810 V ● 0.785 0.8 0.815 V FB Pin Bias Current 60 100 nA Switching Frequency IDA < 1.2A 0.3 2.5 MHz RT = 15.4kΩ, IDA < 1.2A 1.9 2.1 2.3 MHz Minimum On Time SYNC/MODE > 0.8V, BD < 6V 100 110 ns Minimum Off Time 150 200 ns Switch VCESAT ISW = 1.2A 680 mV Switch Current Limit (Note 3) 1.9 2.3 2.6 A ● 1.85 2.3 2.65 A Switch Active Current SW = 10V (Note 4) 400 600 µA SW = 0V (Note 5) 20 30 µA BOOST Pin Current ISW = 1.2A 20 mA Minimum Boost Voltage Above Switch ISW = 1.2A 2.2 2.4 V Max BD Pin Active Load Current SYNC/MODE > 0.8V, BD < 6V 30 40 mA BD Pin Voltage to Disable Active Load ● 6 6.5 7 V DA Pin Current to Stop OSC ● 1.2 1.7 A SYNC/MODE High ● 0.8 V SYNC/MODE Low ● 0.4 V SYNC/MODE Bias Current 0.2 µA SS Threshold 0.9 V SS Source Current VSS = 1V 1.3 2 2.7 µA EN/UVLO Bias Current VEN/UVLO = 10V 40 µA VEN/UVLO = 0V 1 µA EN/UVLO Threshold to Turn Off ● 1.22 1.28 1.34 V EN/UVLO Hysteresis Current 1.8 2.4 3 µA Boost Diode Forward Drop IBD to IBOOST = 200mA 0.85 V
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 Slope compensation reduces current limit at higher duty cycle. Maximum Rating condition for extended periods may affect device
Note 4:
Current flows into pin. reliability and lifetime.
Note 5:
Current flows out of pin.
Note 2:
The LT3686AE is guaranteed to meet performance specifications
Note 6:
This IC includes overtemperature protection that is intended to protect from 0°C to 125°C junction temperature. Specifications over the –40°C the device during momentary overload conditions. Junction temperature will to 125°C operating junction temperature range are assured by design, exceed the maximum operating junction temperature when overtemperature characterization and correlation with statistical process controls. The protection is active. Continuous operation above the specified maximum LT3686AI is guaranteed over the full –40°C to 125°C operating junction operating junction temperature may impair device reliability. See High temperature range. The LT3686AH is guaranteed over the full –40°C to Temperature Considerations section. Also see Operation section. 150°C operating junction temperature range. High junction temperatures degrade operating lifetimes; operating lifetime is derated for junction
Note 7:
Absolute Maximum Voltage at VIN and EN/UVLO pins is 60V for temperatures greater than 125°C. (Note 6) nonrepetitive one second transients, and 55V for continuous operation. 3686afa 3 Document Outline Features Description Applications Typical Application 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