LT3480 ELECTRICAL CHARACTERISTICS guaranteed over the –40°C to 125°C temperature range. The LT3480H Note 4: This is the minimum voltage across the boost capacitor needed to specifications are guaranteed over the –40°C to 150°C temperature range. guarantee full saturation of the switch. The LT3480MP specifications are guaranteed over the –55°C to 150°C Note 5: For operation at TJ ≤ 125°C, the absolute maximum voltage at VIN temperature range. and RUN/SS pins is 40V for continuous operation and 60V for up to Note 3: Bias current flows out of the FB pin. 1 second nonrepetitive transients. For operation at TJ > 125°C, the absolute maximum voltage at VIN and RUN/SS pins is 36V. TYPICAL PERFORMANCE CHARACTERISTICSEfficiencyEfficiencyEfficiency 100 90 90 10 VIN = 7V V 85 IN = 12V VIN = 12V 90 80 80 V POWER LOSS (W) V IN = 34V IN = 34V 70 1 80 75 VIN = 24V VIN = 24V 70 60 70 65 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) 50 0.1 60 V 60 IN = 12V VOUT = 3.3V 55 40 L: NEC PLC-0745-5R6 L: NEC PLC-0745-5R6 L = 5.6µH V F = 800 kHz 50 VOUT = 5V f: 800kHz 50 OUT = 3.3V f: 800kHz 30 0.01 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0 0.5 1.0 1.5 2 LOAD CURRENT (A) LOAD CURRENT (A) LOAD CURRENT (A) 3480 G27 3480 G01 3480 G02 No Load Supply CurrentNo Load Supply CurrentMaximum Load Current 120 400 4.0 VOUT = 3.3V CATCH DIODE: DIODES, INC. PDS360 350 100 VIN = 12V 3.5 TYPICAL 300 VOUT = 3.3V 80 INCREASED SUPPLY 3.0 250 CURRENT DUE TO CATCH DIODE LEAKAGE AT 60 200 HIGH TEMPERATURE 2.5 Y CURRENT (µA) Y CURRENT (µA) MINIMUM 150 40 LOAD CURRENT (A) 2.0 SUPPL SUPPL 100 VOUT = 3.3V 20 TA = 25 °C 50 1.5 L = 4.7µH f = 800 kHz 0 0 1.0 0 5 10 15 20 25 30 35 –50 –25 0 25 50 75 100 125 150 5 10 15 20 25 30 INPUT VOLTAGE (V) TEMPERATURE (°C) INPUT VOLTAGE (V) 3480 G04 3480 G05 3480 G06 3480fe 4 For more information www.linear.com/LT3480 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
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