Datasheet LTC3608 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | 18V, 8A Monolithic Synchronous Step-Down DC/DC Converter |
| Pages / Page | 26 / 5 — Efficiency vs Load Current. Efficiency vs Input Voltage. … |
| File Format / Size | PDF / 480 Kb |
| Document Language | English |
Efficiency vs Load Current. Efficiency vs Input Voltage. Frequency vs Input Voltage. Frequency vs Load Current. Load Regulation
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Text Version of Document
LTC3608 typical perForMance characteristics
Efficiency vs Load Current Efficiency vs Input Voltage Frequency vs Input Voltage
100 100 650 FCB = 5V FCB = 0V 90 FIGURE 6 CIRCUIT FIGURE 6 CIRCUIT ILOAD = 10A 80 600 95 70 60 550 ILOAD = 10A 50 90 40 VOUT = 5V I 500 EFFICIENCY (%) V LOAD = 1A OUT = 3.3V EFFICIENCY (%) 30 V FREQUENCY (kHz) ILOAD = 1A OUT = 2.5V 85 20 VOUT = 2.5V V 450 OUT = 1.8V 10 V V IN = 12V OUT = 1.2V FREQ = 550kHz VOUT = 1V 0 80 400 0.01 0.1 1 10 5 10 15 20 5 10 15 20 LOAD CURRENT (A) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 3608 G04 3608 G05 3608 G06
Frequency vs Load Current Load Regulation ITH Voltage vs Load Current
700 0.80 2.5 FIGURE 6 CIRCUIT 0.60 600 2.0 CONTINUOUS MODE 0.40 500 0.20 1.5 400 (%) DISCONTINUOUS MODE 0 TAGE (V) CONTINUOUS 300 V OUT MODE Δ VOL –0.20 1.0 I TH FREQUENCY (kHz) 200 DISCONTINUOUS –0.40 MODE 0.5 100 –0.60 0 –0.80 0 0 2 4 6 8 10 0 2 4 6 8 10 0 5 10 LOAD CURRENT (A) LOAD CURRENT (A) LOAD CURRENT (A) 3608 G07 3608 G08 3608 G09
Load Current vs ITH Voltage and VRNG On-Time vs ION Current On-Time vs VON Voltage
25 10000 1000 VRNG = V I 1V VON = 0V ON = 30µA 20 0.7V 800 15 0.5V 1000 10 600 5 ON-TIME (ns) ON-TIME (ns) 400 LOAD CURRENT (A) 100 0 200 –5 –10 10 0 0 0.5 1.0 1.5 2.0 2.5 3.0 1 10 100 0 1 2 3 ITH VOLTAGE (V) ION CURRENT (µA) VON VOLTAGE (V) 3608 G10 3608 G11 3608 G12 3608fc 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 Typical Applications Package Description Revision History Typical Application Related Parts
Efficiency vs Load Current Efficiency vs Input Voltage Frequency vs Input Voltage
100 100 650 FCB = 5V FCB = 0V 90 FIGURE 6 CIRCUIT FIGURE 6 CIRCUIT ILOAD = 10A 80 600 95 70 60 550 ILOAD = 10A 50 90 40 VOUT = 5V I 500 EFFICIENCY (%) V LOAD = 1A OUT = 3.3V EFFICIENCY (%) 30 V FREQUENCY (kHz) ILOAD = 1A OUT = 2.5V 85 20 VOUT = 2.5V V 450 OUT = 1.8V 10 V V IN = 12V OUT = 1.2V FREQ = 550kHz VOUT = 1V 0 80 400 0.01 0.1 1 10 5 10 15 20 5 10 15 20 LOAD CURRENT (A) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 3608 G04 3608 G05 3608 G06
Frequency vs Load Current Load Regulation ITH Voltage vs Load Current
700 0.80 2.5 FIGURE 6 CIRCUIT 0.60 600 2.0 CONTINUOUS MODE 0.40 500 0.20 1.5 400 (%) DISCONTINUOUS MODE 0 TAGE (V) CONTINUOUS 300 V OUT MODE Δ VOL –0.20 1.0 I TH FREQUENCY (kHz) 200 DISCONTINUOUS –0.40 MODE 0.5 100 –0.60 0 –0.80 0 0 2 4 6 8 10 0 2 4 6 8 10 0 5 10 LOAD CURRENT (A) LOAD CURRENT (A) LOAD CURRENT (A) 3608 G07 3608 G08 3608 G09
Load Current vs ITH Voltage and VRNG On-Time vs ION Current On-Time vs VON Voltage
25 10000 1000 VRNG = V I 1V VON = 0V ON = 30µA 20 0.7V 800 15 0.5V 1000 10 600 5 ON-TIME (ns) ON-TIME (ns) 400 LOAD CURRENT (A) 100 0 200 –5 –10 10 0 0 0.5 1.0 1.5 2.0 2.5 3.0 1 10 100 0 1 2 3 ITH VOLTAGE (V) ION CURRENT (µA) VON VOLTAGE (V) 3608 G10 3608 G11 3608 G12 3608fc 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 Typical Applications Package Description Revision History Typical Application Related Parts
