Datasheet LTC3807 (Analog Devices) - 6

LTC3807
TYPICAL PERFORMANCE CHARACTERISTICS Load Step Load Step Load Step Burst Mode Operation Pulse-Skipping Mode Forced Continuous Mode
VOUT VOUT VOUT 100mV/DIV 100mV/DIV 100mV/DIV AC- AC- AC- COUPLED COUPLED COUPLED IL IL IL 2A/DIV 2A/DIV 2A/DIV 50µs/DIV 3807 G04 50µs/DIV 3807 G05 50µs/DIV 3807 G06 LOAD STEP = 100mA TO 3A LOAD STEP = 100mA TO 3A LOAD STEP = 100mA TO 3A VIN = 12V VIN = 12V VIN = 12V VOUT = 3.3V VOUT = 3.3V VOUT = 3.3V FIGURE 12 CIRCUIT FIGURE 12 CIRCUIT FIGURE 12 CIRCUIT
Inductor Current at Light Load Soft Start-Up Tracking Start-Up
FORCED CONTINUOUS MODE VOUT = 8.5V MASTER 2V/DIV 2V/DIV Burst Mode OPERATION V V 1A/DIV OUT = 3.3V OUT 2V/DIV 2V/DIV PULSE-SKIPPING MODE 5µs/DIV 3807 G07 2ms/DIV 3807 G08 2ms/DIV 3807 G09 VIN = 12V FIGURES 12, 14 CIRCUITS FIGURE 12, 14 CIRCUITS VOUT = 3.3V TRACKING RESISTORS ADDED ILOAD = 200µA TO FIGURE 12 CIRCUIT
Load Step Efficiency vs Output Current Forced Continuous Mode Start-Up
100 Burst Mode OPERATION 90 VOUT RUN 500mV/DIV 5V/DIV 80 AC- COUPLED PGOOD 70 5V/DIV 60 I VOUT 50 L 5A/DIV 5V/DIV FC Mode 40 EFFICIENCY (%) PULSE SKIP 30 Mode 100µs/DIV 3807 G29 2ms/DIV 3807 G30 20 LOAD STEP = 300mA TO 7A V V IN = 24V IN = 24V VIN = 24V VOUT = 12V 10 VOUT = 12V V FIGURE 13 CIRCUIT FIGURE 13 CIRCUIT OUT = 12V 0 FIGURE 13 CIRCUIT 0.0001 0.001 0.01 0.1 1 10 IOUT (A) 3807 G28 3807fa 6 For more information www.linear.com/LTC3807 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Package Description Typical Application Related Parts Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Package Description Revision History Related Parts