Datasheet LTC3899 (Analog Devices) - 8

LTC3899
TYPICAL PERFORMANCE CHARACTERISTICS Efficiency and Power Loss Efficiency Shutdown (RUN) Threshold vs Output Current (Boost) vs Input Voltage (Boost) vs Temperature
100 10000 100 1.4 BURST EFFICIENCY DRVSET = INTVCC 90 98 DRVSET = 0V 1.35 80 FCM LOSS 1000 96 PULSE-SKIPPING POWER LOSS (mW) 1.3 RISING 70 EFFICIENCY 94 60 100 92 1.25 PULSE-SKIPPING TAGE (V) 50 LOSS 90 1.2 FALLING 40 BURST 10 88 EFFICIENCY (%) 1.15 LOSS EFFICIENCY (%) 30 86 RUN PIN VOL 1.1 20 VIN = 5V 1 84 FIGURE 12 CIRCUIT V 10 OUT = 10V 82 VOUT = 10V 1.05 FCM EFFICIENCY ILOAD = 2A 0 0.1 80 1 0.0001 0.001 0.01 0.1 1 10 2 4 6 8 10 12 -75 -50 -25 0 25 50 75 100 125 150 OUTPUT CURRENT (A) INPUT VOLTAGE (V) TEMPERATURE (°C) 3899 G10 3899 G11 3899 G12
Load Step (Boost) Load Step (Boost) Load Step (Boost) Forced Continuous Mode Pulse-Skipping Mode Burst Mode Operation
VOUT VOUT VOUT 500mV/DIV 500mV/DIV 500mV/DIV AC COUPLED AC COUPLED AC COUPLED IL IL IL 5A/DIV 5A/DIV 5A/DIV 100µs/DIV 100µs/DIV 100µs/DIV VIN = 5V 3899 G13 VIN = 5V 3899 G14 VIN = 5V 3899 G15 VOUT = 10V VOUT = 10V VOUT = 10V FIGURE 12 CIRCUIT FIGURE 12 CIRCUIT FIGURE 12 CIRCUIT
Inductor Current at Light Load Boost Regulated Feedback (Boost) Soft Start-Up (Boost) Voltage vs Temperature
1.212 FORCED RUN3 1.209 CONTINUOUS 5V/DIV MODE TAGE (V) 1.206 Burst Mode OPERATION 1.203 5A/DIV VOUT3 1.2 2V/DIV PULSE- SKIPPING 1.197 MODE GND TED FEEDBACK VOL 1.194 2µs/DIV 2ms/DIV VIN = 7V 3899 G16 3899 G17 REGULA 1.191 V FIGURE 12 CIRCUIT OUT = 10V ILOAD = 1mA 1.188 FIGURE 12 CIRCUIT -75 -50 -25 0 25 50 75 100 125 150 TEMPERATURE (°C) 3899 G18 3899fa 8 For more information www.linear.com/LTC3899 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagrams Operation Typical Applications Package Description Typical Application Related Parts