Datasheet LTC3871, LTC3871-1 (Analog Devices) - 6

LTC3871/LTC3871-1
TYPICAL PERFORMANCE CHARACTERISTICS Efficiency Buck Mode Power Loss Buck Mode Efficiency Boost Mode
100 30 100 VHIGH = 48V 95 V 95 25 LOW = 12V FIGURE 12 CIRCUIT 90 90 20 85 85 80 80 15 75 75 70 EFFICIENCY (%) POWER LOSS (W) 10 EFFICIENCY (%) 65 70 VHIGH = 48V 5 60 VHIGH = 48V 65 VLOW = 12V 55 VLOW = 12V FIGURE 12 CIRCUIT FIGURE 12 CIRCUIT 60 0 50 1 10 100 1 10 100 0.1 1 10 50 ILOAD (A) ILOAD (A) ILOAD (A) 3871 G01 3871 G02 3871 G03
SS Pull-Up Current Power Loss Boost Mode vs Temperature RUN Threshold vs Temperature
30 2.0 1.4 V ON HIGH = 48V OFF V 25 LOW = 12V FIGURE 12 CIRCUIT 1.8 1.3 μA) 20 1.6 1.2 15 1.4 1.1 POWER LOSS (W) 10 RUN THRESHOLD (V) SS PULL-UP CURRENT ( 1.2 1.0 5 0 1.0 0.9 0.1 1 10 50 –45 –20 5 30 55 80 105 130 155 –45 –20 5 30 55 80 105 130 155 ILOAD (A) TEMPERATURE (°C) TEMPERATURE (°C) 3871 G04 3871 G05 3871 G06
Regulated Feedback Voltage Oscillator Frequency Undervoltage Lockout Threshold vs Temperature vs T vs Temperature (V5) vs Temperature
1.206 230.0 5.0 1.204 220.0 4.8 TAGE (V) 1.202 210.0 RISING 4.6 1.200 200.0 4.4 1.198 TED FEEDBACK VOL FREQUENCY (kHz) 190.0 UVLO THRESHOLD (V) 4.2 1.196 180.0 REGULA 1.194 170.0 4.0 –45 –20 5 30 55 80 105 130 155 –45 –20 5 30 55 80 105 130 155 –45 –20 5 30 55 80 105 130 155 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3871 G07 3871 G08 3871 G09 Rev. B 6 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts