Datasheet LTC3708 (Analog Devices) - 6
| Hersteller | Analog Devices |
| Beschreibung | Fast 2-Phase, No RSENSE Buck Controller with Output Tracking |
| Seiten / Seite | 34 / 6 — TYPICAL PERFORMANCE CHARACTERISTICS. Power Loss vs Load Current. … |
| Dateiformat / Größe | PDF / 667 Kb |
| Dokumentensprache | Englisch |
TYPICAL PERFORMANCE CHARACTERISTICS. Power Loss vs Load Current. Frequency vs Input Voltage. Frequency vs Load Current
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LTC3708
TYPICAL PERFORMANCE CHARACTERISTICS Power Loss vs Load Current Frequency vs Input Voltage Frequency vs Load Current
3.5 V 260 250 IN = 5V 3.0 VOUT = 2.5V 240 IOUT = 15A 200 2.5 VOUT = 1.8V 2.0 220 150 EXTERNAL SYNCHRONIZATION (ANY IOUT) 1.5 200 IOUT = 0A 100 POWER LOSS (W) FREQUENCY (kHz) FREQUENCY (kHz) 1.0 FORCED CONTINUOUS MODE 180 50 0.5 EXTERNAL SYNCHRONIZATION DISCONTINUOUS MODE 0 160 0 10 100 1000 10000 100000 5 10 15 20 25 0 5 10 15 LOAD (mA) INPUT VOLTAGE (V) LOAD CURRENT (A) 3707 G07 3708 G08 3708 G09
Current Sense Threshold On-Time vs ION Current On-Time vs Temperature vs ITH Voltage
10000 300 300 V I RNG = 2V ON = 30µA 250 1.4V 250 200 1V 150 1000 200 0.7V 100 150 50 0.5V ION = 60µA ON-TIME (ns) ON-TIME (ns) 0 100 100 –50 –100 50 CURRENT SENSE THRESHOLD (mV) –150 10 0 –200 1 10 100 1000 –50 –25 0 25 50 75 100 125 150 0 0.5 1 1.5 2 2.5 ION CURRENT (µA) TEMPERATURE (°C) ITH VOLTAGE (V) 3708 G10 3708 G11 3708 G12
Maximum Current Sense Maximum Current Sense Load Regulation Threshold vs VRNG Voltage Threshold vs Temperature (Figure 13 Circuit)
350 160 0 VRNG = 1V 300 –0.1 150 FORCED 250 –0.2 CONTINUOUS MODE 200 140 –0.3 (%) 150 –0.4 130 ∆V OUT DISCONTINUOUS MODE 100 –0.5 120 50 –0.6 MAXIMUM CURRENT SENSE THRESHOLD (mV) 0 MAXIMUM CURRENT SENSE THRESHOLD (mV) 110 –0.7 0.5 0.75 1 1.25 1.5 1.75 2 –50 –25 0 25 50 75 100 125 150 0 3 6 9 12 15 VRNG VOLTAGE (V) TEMPERATURE (°C) LOAD CURRENT (A) 3708 G13 3708 G14 3708 G15 3708fc 6 For more information www.linear.com/LTC3708 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Operation Applications Information Package Description Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS Power Loss vs Load Current Frequency vs Input Voltage Frequency vs Load Current
3.5 V 260 250 IN = 5V 3.0 VOUT = 2.5V 240 IOUT = 15A 200 2.5 VOUT = 1.8V 2.0 220 150 EXTERNAL SYNCHRONIZATION (ANY IOUT) 1.5 200 IOUT = 0A 100 POWER LOSS (W) FREQUENCY (kHz) FREQUENCY (kHz) 1.0 FORCED CONTINUOUS MODE 180 50 0.5 EXTERNAL SYNCHRONIZATION DISCONTINUOUS MODE 0 160 0 10 100 1000 10000 100000 5 10 15 20 25 0 5 10 15 LOAD (mA) INPUT VOLTAGE (V) LOAD CURRENT (A) 3707 G07 3708 G08 3708 G09
Current Sense Threshold On-Time vs ION Current On-Time vs Temperature vs ITH Voltage
10000 300 300 V I RNG = 2V ON = 30µA 250 1.4V 250 200 1V 150 1000 200 0.7V 100 150 50 0.5V ION = 60µA ON-TIME (ns) ON-TIME (ns) 0 100 100 –50 –100 50 CURRENT SENSE THRESHOLD (mV) –150 10 0 –200 1 10 100 1000 –50 –25 0 25 50 75 100 125 150 0 0.5 1 1.5 2 2.5 ION CURRENT (µA) TEMPERATURE (°C) ITH VOLTAGE (V) 3708 G10 3708 G11 3708 G12
Maximum Current Sense Maximum Current Sense Load Regulation Threshold vs VRNG Voltage Threshold vs Temperature (Figure 13 Circuit)
350 160 0 VRNG = 1V 300 –0.1 150 FORCED 250 –0.2 CONTINUOUS MODE 200 140 –0.3 (%) 150 –0.4 130 ∆V OUT DISCONTINUOUS MODE 100 –0.5 120 50 –0.6 MAXIMUM CURRENT SENSE THRESHOLD (mV) 0 MAXIMUM CURRENT SENSE THRESHOLD (mV) 110 –0.7 0.5 0.75 1 1.25 1.5 1.75 2 –50 –25 0 25 50 75 100 125 150 0 3 6 9 12 15 VRNG VOLTAGE (V) TEMPERATURE (°C) LOAD CURRENT (A) 3708 G13 3708 G14 3708 G15 3708fc 6 For more information www.linear.com/LTC3708 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Operation Applications Information Package Description Typical Application Related Parts