Datasheet LTC3899 (Analog Devices) - 7

LTC3899
TYPICAL PERFORMANCE CHARACTERISTICS Efficiency and Power Loss Efficiency vs Output Current (Buck) vs Output Current (Buck) Efficiency vs Input Voltage (Buck)
100 10000 100 98 BURST EFFICIENCY 90 90 96 80 1000 80 94 FCM LOSS POWER LOSS (mW) V DRVSET = INTV 70 70 IN = 10V CC VIN = 20V 92 DRVSET = 0V 60 PULSE-SKIPPING 100 60 VIN = 30V LOSS 90 50 50 PULSE-SKIPPING BURST LOSS 88 40 EFFICIENCY 10 40 EFFICIENCY (%) FCM EFFICIENCY EFFICIENCY (%) EFFICIENCY (%) 86 30 30 20 1 20 84 FIGURE 12 CIRCUIT FIGURE 12 CIRCUIT FIGURE 12 CIRCUIT 10 V V IN = 10V 10 VOUT = 5V 82 OUT = 5V V Burst Mode OPERATION ILOAD = 4A 0 OUT = 5V 0.1 0 80 0.0001 0.001 0.01 0.1 1 10 0.0001 0.001 0.01 0.1 1 10 0 10 20 30 40 50 60 OUTPUT CURRENT (A) OUTPUT CURRENT (A) INPUT VOLTAGE (V) 3899 G01 3899 G02 3899 G03
Load Step (Buck) Load Step (Buck) Load Step (Buck) Burst Mode Operation Pulse-Skipping Mode Forced Continuous Mode
VOUT VOUT VOUT 100mV/DIV 100mV/DIV 100mV/DIV AC COUPLED AC COUPLED AC COUPLED IL IL 2A/DIV 2A/DIV IL 2A/DIV 50µs/DIV 50µs/DIV 50µs/DIV VIN = 12V 3899 G04 VIN = 12V 3899 G05 VIN = 12V 3899 G06 VOUT = 5V VOUT = 5V VOUT = 5V FIGURE 12 CIRCUIT FIGURE 12 CIRCUIT FIGURE 12 CIRCUIT
Inductor Current at Light Load Buck Regulated Feedback Voltage (Buck) Soft Start-Up (Buck) vs Temperature
808 RUN1, 2 FORCED 5V/DIV 806 CONTINUOUS MODE VOUT2 2V/DIV 804 Burst Mode TAGE (mV) OPERATION VOUT1 802 1A/DIV 2V/DIV 800 PULSE- SKIPPING 798 MODE TED FEEDBACK VOL 2µs/DIV 2ms/DIV 796 VIN = 12V 3899 G07 FIGURE 12 CIRCUIT 3899 G08 794 V REGULA OUT = 5V ILOAD = 1mA FIGURE 12 CIRCUIT 792-75 -50 -25 0 25 50 75 100 125 150 TEMPERATURE (°C) 3899 G09 3899fa For more information www.linear.com/LTC3899 7 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