LT3970 Series elecTrical characTerisTicsNote 1: Stresses beyond those listed under Absolute Maximum Ratings LT3970I is guaranteed over the full –40°C to 125°C operating junction may cause permanent damage to the device. Exposure to any Absolute temperature range. The LT3970H is guaranteed over the full –40°C to Maximum Rating condition for extended periods may affect device 150°C operating junction temperature range. High junction temperatures reliability and lifetime. degrade operating lifetimes. Operating lifetime is derated at junction Note 2: The LT3970E is guaranteed to meet performance specifications temperatures greater than 125°C. from 0°C to 125°C junction temperature. Specifications over the –40°C Note 3: Bias current flows into the FB pin. to 125°C operating junction temperature range are assured by design, Note 4: This is the minimum voltage across the boost capacitor needed to characterization, and correlation with statistical process controls. The guarantee full saturation of the switch. Typical perFormance characTerisTics TA = 25°C, unless otherwise noted.Efficiency, VOUT = 3.3VEfficiency, VOUT = 5VLT3970 Feedback Voltage 90 90 1.220 FRONT PAGE APPLICATION 80 V 80 IN = 12V V V 1.215 IN = 24V V IN = 12V IN = 24V 70 70 1.210 60 VIN = 36V V 60 IN = 36V 50 1.205 EFFICIENCY (%) EFFICIENCY (%) 50 40 FRONT PAGE APPLICATION FEEDBACK VOLTAGE (V) 1.200 30 VOUT = 3.3V 40 R1 = 1M R2 = 576k 20 30 1.195 0.01 0.1 1 10 100 0.01 0.1 1 10 100 –50 –25 0 25 50 75 100 125 150 LOAD CURRENT (mA) LOAD CURRENT (mA) TEMPERATURE (°C) 3970 G01 3970 G02 3970 G03 LT3970-3.3 Output VoltageLT3970-3.42 Output VoltageLT3970-5 Output Voltage 3.32 3.44 5.04 3.31 3.43 5.02 3.30 3.42 5.00 3.29 3.41 4.98 OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V) 3.28 3.40 4.96 3.27 3.39 4.94 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3970 G04 3970 G05 3970 G06 3970fc 4 Document Outline Features Applications Description 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 Related Parts
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