Datasheet LTC3609 (Analog Devices) - 5

LTC3609 Typical perForMance characTerisTics
Efficiency vs Load Current Efficiency vs Input Voltage Frequency vs Input Voltage
100 100 650 FCB = 5V 90 FIGURE 6 CIRCUIT 80 600 95 70 VOUT = 5V V I OUT = 3.3V LOAD = 6A 60 VOUT = 2.5V 550 V ILOAD = 6A 50 OUT = 1.8V V 90 OUT = 1.5V 40 VOUT = 1.2V 500 EFFICIENCY (%) VOUT = 1V EFFICIENCY (%) 30 ILOAD = 1A FREQUENCY (kHz) 85 ILOAD = 1A 20 450 10 VIN = 12V FCB = 0V FREQUENCY = 550kHz FIGURE 6 CIRCUIT 0 80 400 0.01 0.1 1 10 5 8 11 14 17 20 23 26 29 32 5 8 11 14 17 20 23 26 29 32 LOAD CURRENT (A) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 3609 G04 3609 G05 3609 G06
Frequency vs Load Current Load Regulation ITH Voltage vs Load Current
700 0.80 2.5 FIGURE 6 CIRCUIT FIGURE 6 CIRCUIT CONTINUOUS MODE 0.60 600 2.0 0.40 500 0.20 1.5 400 (%) 0 TAGE (V) CONTINUOUS MODE 300 ∆V OUT VOL –0.20 1.0 DISCONTINUOUS MODE I TH FREQUENCY (kHz) 200 –0.40 0.5 DISCONTINUOUS 100 –0.60 MODE 0 –0.80 0 0 2 4 6 8 0 2 4 6 8 0 2 4 6 8 LOAD CURRENT (A) LOAD CURRENT (A) LOAD CURRENT (A) 3609 G07 3609 G08 3609 G09
Load Current vs ITH Voltage at Different VRNG On-Time vs ION Current On-Time vs VON Voltage
15 10000 1000 VVON = 0V ION = 30µA VRNG = 1.2V 10 800 V 1000 RNG = 0.7V 5 600 VRNG = 1V 0 ON-TIME (ns) ON-TIME (ns) 400 LOAD CURRENT (A) 100 –5 200 –10 10 0 0 0.5 1.0 1.5 2.0 2.5 1 10 100 0 1 2 3 ITH VOLTAGE (V) ION CURRENT (µA) VON VOLTAGE (V) 3609 G10 3609 G11 3609 G12 3609fb Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration order information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts