LT3592 ELECTRICAL CHARACTERISTICSThe l denotes the specifi cations which apply over the full operatingtemperature range, otherwise specifi cations are at TA = 25°C. VIN = 12V, VBOOST = 16V, VOUT = 4V unless otherwise noted. (Note 2)PARAMETERCONDITIONSMINTYPMAXUNITS Minimum Input Voltage l 3.25 3.6 V Input Quiescent Current in Shutdown Not Switching 2 3 mA VSHDN = 0.3V 0.1 2 μA CAP to OUT Voltage 0.4Ω CAP to OUT BRIGHT = 1.4V l 190 200 210 mV BRIGHT = 0.3V l 18 20 22 mV DA Pin Current to Stop OSC –0.8 –1 –1.2 A Switching Frequency RT = 357k 350 400 450 kHz RT = 140k 800 900 1000 kHz RT = 48.7k 1.9 2.2 2.5 MHz Maximum Duty Cycle RT = 140k 90 94 % SHDN Input High Voltage 2.3 V SHDN Input Low Voltage 0.3 V BRIGHT Input High Voltage 1.4 V BRIGHT Input Low Voltage 0.3 V Switch Current Limit (Note 4) l 0.85 1.25 1.5 A Switch VCESAT ISW = 500mA 300 mV Boost Pin Current ISW = 500mA 20 30 mA Switch Leakage Current 1 10 μA Minimum Boost Voltage (VBOOST – VIN) VOUT = 4V 1.8 2.5 V Boost Diode Forward Voltage IDIO = 50mA 800 mV VFB Voltage OUT = CAP = 4V, Bright = 12V l 1.185 1.21 1.235 V VFB Input Leakage Current VFB = 1.21V l –250 250 nA Note 1: Stresses beyond those listed under Absolute Maximum Ratings Note 3: This IC includes overtemperature protection that is intended may cause permanent damage to the device. Exposure to any Absolute to protect the device during momentary overload conditions. Junction Maximum Rating condition for extended periods may affect device temperature will exceed the maximum operating junction temperature reliability and lifetime. when overtemperature protection is active. Continuous operation above Note 2: The LT3592E is guaranteed to meet performance specifi cations the specifi ed maximum operating junction temperature may result in from 0°C to 125°C junction temperature. Specifi cations over the –40°C device degradation or failure. to 125°C operating junction temperature range are assured by design, Note 4: Switch Current Measurements are performed when the outputs characterization and correlation with statistical process controls. The are not switching. Slope compensation reduces current limit at higher duty LT3592I is guaranteed over the full –40°C to 125°C operating junction cycles. temperature range. The operating lifetime is derated at junction temperatures greater than 125°C. 3592fc 3
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