LT3493 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)PARAMETERCONDITIONSMINTYPMAXUNITS Switch Current Limit (Note 3) 1.4 1.75 2.2 A Switch VCESAT ISW = 1A 330 mV Switch Leakage Current 2 μA Minimum Boost Voltage Above Switch ISW = 1A 1.85 2.2 V BOOST Pin Current ISW = 1A 30 50 mA SHDN Input Voltage High 2.3 V SHDN Input Voltage Low 0.3 V SHDN Bias Current VSHDN = 2.3V (Note 5) 6 15 μA VSHDN = 0V 0.01 0.1 μA 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 fl ows out of pin. reliability and lifetime. Note 5: Current fl ows into pin. Note 2: The LT3493E is guaranteed to meet performance specifi cations from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls. The LT3493I specifi cations are guaranteed over the –40°C to 125°C temperature range. TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted.Effi ciency (VOUT = 5V, L = 10μH)Effi ciency (VOUT = 3.3V, L = 10μH)Effi ciency (VOUT = 1.8V, L = 4.7μH) 95 90 80 90 85 75 85 80 80 70 75 75 70 65 70 65 EFFICIENCY (%) 65 EFFICIENCY (%) EFFICIENCY (%) 60 60 60 VIN = 8V VIN = 8V 55 55 V 55 IN = 12V VIN = 12V VIN = 5V VIN = 24V VIN = 24V VIN = 12V 50 50 50 0 0.2 0.4 0.6 0.8 1.0 1.2 0 0.2 0.4 0.6 0.8 1.0 1.2 0 0.2 0.4 0.6 0.8 1.0 1.2 LOAD CURRENT (A) LOAD CURRENT (A) LOAD CURRENT (A) 3493 G01 3493 G02 3493 G03 3493fb 3
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