Datasheet LT3991, LT3991-3.3, LT3991-5 (Analog Devices) - 4

LT3991/LT3991-3.3/LT3991-5
Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. Efficiency, VOUT = 5V Efficiency, VOUT = 3.3V Efficiency, VOUT = 5V
100 90 100 V V V IN = 12V OUT = 5V IN = 12V 90 R1 = 1M 90 80 R2 = 309k 80 V 80 70 V IN = 12V IN = 24V 70 VIN = 24V VIN = 36V 70 60 60 VIN = 36V VIN = 48V 50 VIN = 24V 60 VIN = 48V 50 40 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) VIN = 36V 50 40 30 VIN = 48V 20 40 VOUT = 5V 30 R1 = 1M 10 R2 = 309k 30 20 0 0 0.2 0.4 0.6 0.8 1 1.2 0 0.2 0.4 0.6 0.8 1 1.2 0.01 0.1 1 10 100 1000 LOAD CURRENT (A) LOAD CURRENT (A) LOAD CURRENT (mA) 3991 G01 3991 G02 3991 G03
Efficiency, VOUT = 3.3V No Load Supply Current No Load Supply Current
90 100 3.0 DIODES, INC. OUTPUT IN REGULATION 80 DFLS2100 70 VIN = 12V 2.5 V 60 IN = 24V VIN = 36V 50 LT3991-5 VIN = 48V 10 2.0 40 LT3991-3.3 EFFICIENCY (%) 30 INPUT CURRENT (µA) INPUT CURRENT (µA) 20 1.5 10 0 1 1.0 0.01 0.1 1 10 100 1000 –55 –25 5 35 65 95 125 155 5 10 15 20 25 30 35 40 45 50 55 LOAD CURRENT (mA) TEMPERATURE (°C) INPUT VOLTAGE (V) 3991 G04 3991 G05 3991 G06
LT3991 Feedback Voltage LT3991-3.3 Output Voltage LT3991-5 Output Voltage
1.205 3.345 5.06 1.200 3.330 5.04 1.195 3.315 5.02 TAGE (V) 1.190 3.300 5.00 1.185 3.285 4.98 FEEDBACK VOL OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V) 1.180 3.270 4.96 1.175 3.255 4.94 –55 –25 5 35 65 95 125 155 –50 –25 5 35 65 95 125 155 –50 –25 5 35 65 95 125 155 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3991 G07 3991 G28 3991 G29 3991fa 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