LT1933 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 = 17V, unless otherwise noted. (Note 2)PARAMETERCONDITIONSMINTYPMAX UNITS Undervoltage Lockout 3.35 3.6 V Feedback Voltage l 1.225 1.245 1.265 V FB Pin Bias Current VFB = Measured VREF + 10mV (Note 4) l 40 120 nA Quiescent Current Not Switching 1.6 2.5 mA Quiescent Current in Shutdown VSHDN = 0V 0.01 2 μA Reference Line Regulation VIN = 5V to 36V 0.01 %/V Switching Frequency VFB = 1.1V 400 500 600 kHz VFB = 0V 55 kHz Maximum Duty Cycle l 88 94 % Switch Current Limit (Note 3) 0.75 1.05 A Switch VCESAT ISW = 400mA, S6 Package 370 500 mV ISW = 400mA, DCB6 Package 370 mV Switch Leakage Current 2 μA Minimum Boost Voltage Above Switch ISW = 400mA 1.9 2.3 V BOOST Pin Current ISW = 400mA 18 25 mA SHDN Input Voltage High 2.3 V SHDN Input Voltage Low 0.3 V SHDN Bias Current VSHDN = 2.3V (Note 5) 34 50 μA VSHDN = 0V 0.01 0.1 μA Note 1: Stresses beyond those listed under Absolute Maximum Ratings guaranteed over the –40°C to 125°C temperature range. The LT1933H may cause permanent damage to the device. Exposure to any Absolute specifi cations are guaranteed over the –40°C to 150°C temperature range. 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. Slope compensation reduces current limit at higher duty cycle. Note 2: The LT1933E is guaranteed to meet performance specifi cations Note 4: Current fl ows out of pin. from 0°C to 70°C. Specifi cations over the –40°C to 85°C operating Note 5: Current fl ows into pin. temperature range are assured by design, characterization and correlation with statistical process controls. The LT1933I specifi cations are 1933fe 3
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