Datasheet LTC3892, LTC3892-1, LTC3892-2 (Analog Devices) - 7

LTC3892/ LTC3892-1/LTC3892-2
TYPICAL PERFORMANCE CHARACTERISTICS Efficiency and Power Loss vs Load Current Efficiency vs Output Current
100 10k 100 BURST EFFICIENCY 90 90 80 1k 80 POWER LOSS (mW) 70 FCM LOSS 70 60 100 60 VIN = 10V 50 PULSE- VIN = 12V 50 VIN = 20V 40 SKIPPING VOUT = 5V 10 40 VIN = 30V EFFICIENCY (%) LOSS FIGURE 11 CIRCUIT EFFICIENCY (%) 30 30 VIN = 40V BURST LOSS V 20 1 IN = 50V PULSE-SKIPPING 20 FIGURE 11 CIRCUIT VIN = 60V 10 EFFICIENCY 10 VOUT = 5V FCM EFFICIENCY Burst Mode OPERATION 0 0.1 0 0.0001 0.001 0.01 0.1 1 10 0.0001 0.001 0.01 0.1 1 10 LOAD CURRENT (A) LOAD CURRENT (A) 3892 G01 3892 G02
Load Step Efficiency vs Input Voltage Burst Mode Operation
96 95 94 VOUT 100mV/DIV 93 DRVSET=INTV AC COUPLED CC 92 91 IL DRVSET=0V 2A/DIV 90 EFFICIENCY (%) 89 88 FIGURE 11 CIRCUIT 3892 G04 87 VOUT = 5V 50µs/DIV ILOAD=8A VIN = 12V 86 V 0 5 10 15 20 25 30 35 40 45 50 55 60 OUT = 5V FIGURE 13 CIRCUIT INPUT VOLTAGE (V) 3892 G03
Load Step Load Step Pulse-Skipping Mode Forced Continuous Mode
VOUT VOUT 100mV/DIV 100mV/DIV AC COUPLED AC COUPLED IL IL 2A/DIV 2A/DIV 3892 G05 3892 G06 50µs/DIV 50µs/DIV VIN = 12V VIN = 12V VOUT = 5V VOUT = 5V FIGURE 13 CIRCUIT FIGURE 13 CIRCUIT 38921fc For more information www.linear.com/LTC3892 7 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Typical Performance Characteristics Pin Functions Functional Diagrams Operation Package Description Typical Application Related Parts