Datasheet LTC3727A-1 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | High Efficiency, 2-Phase Synchronous Step-Down Switching Regulators |
| Pages / Page | 32 / 5 — TYPICAL PERFORMANCE CHARACTERISTICS. Supply Current vs Input Voltage and … |
| File Format / Size | PDF / 341 Kb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Supply Current vs Input Voltage and Mode (Figure 13). EXTVCC Voltage Drop
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LTC3727A-1
TYPICAL PERFORMANCE CHARACTERISTICS Supply Current vs Input Voltage and Mode (Figure 13) EXTVCC Voltage Drop Internal 7.5V LDO Line Regulation
1000 160 7.7 VEXTVCC = 8.5V ILOAD = 1mA 140 7.6 800 7.5 BOTH 120 CONTROLLERS ON 7.4 600 100 TAGE (V) 7.3 80 TAGE DROP (mV) VOL 7.2 Y CURRENT (μA) 400 CC VOL 60 V CC 7.1 SUPPL V INT 40 200 EXT 7.0 20 6.9 SHUTDOWN 0 0 6.8 0 10 20 30 0 10 20 30 40 50 0 5 10 15 20 25 30 35 INPUT VOLTAGE (V) CURRENT (mA) INPUT VOLTAGE (V) 3727 G04 3727 G05 3727 G06
Maximum Current Sense Threshold Maximum Current Sense Threshold vs Percent of Nominal Output Maximum Current Sense Threshold vs Duty Factor Voltage (Foldback) vs VRUN/SS (Soft-Start)
150 150 150 VSENSE(CM) = 1.6V 135 125 120 125 105 100 90 (mV) (mV) (mV) 75 75 100 SENSE SENSE SENSE V V 60 V 50 45 75 30 25 15 0 0 50 0 20 40 60 80 100 0 20 40 60 80 100 0 1 2 3 4 5 6 DUTY FACTOR (%) PERCENT OF NOMINAL OUTPUT VOLTAGE (%) VRUN/SS (V) 3727 G07 3727 G08 3727 G09
Current Sense Threshold vs ITH Voltage Load Regulation VITH vs VRUN/SS
150 0.0 2.5 FCB = 0V VOSENSE = 0.7V 125 VIN = 15V FIGURE 1 2.0 100 –0.1 (%) 75 OUT 1.5 (mV) (V) 50 –0.2 ITHV SENSEV 25 1.0 0 NORMALIZED V –0.3 0.5 –25 –50 –0.4 0 0 0.5 1.0 1.5 2.0 2.5 0 1 2 3 4 5 0 1 2 3 4 5 6 VITH (V) LOAD CURRENT (A) VRUN/SS (V) 3727 G10 3727 G11 3727 G12 3727a1fa 5
TYPICAL PERFORMANCE CHARACTERISTICS Supply Current vs Input Voltage and Mode (Figure 13) EXTVCC Voltage Drop Internal 7.5V LDO Line Regulation
1000 160 7.7 VEXTVCC = 8.5V ILOAD = 1mA 140 7.6 800 7.5 BOTH 120 CONTROLLERS ON 7.4 600 100 TAGE (V) 7.3 80 TAGE DROP (mV) VOL 7.2 Y CURRENT (μA) 400 CC VOL 60 V CC 7.1 SUPPL V INT 40 200 EXT 7.0 20 6.9 SHUTDOWN 0 0 6.8 0 10 20 30 0 10 20 30 40 50 0 5 10 15 20 25 30 35 INPUT VOLTAGE (V) CURRENT (mA) INPUT VOLTAGE (V) 3727 G04 3727 G05 3727 G06
Maximum Current Sense Threshold Maximum Current Sense Threshold vs Percent of Nominal Output Maximum Current Sense Threshold vs Duty Factor Voltage (Foldback) vs VRUN/SS (Soft-Start)
150 150 150 VSENSE(CM) = 1.6V 135 125 120 125 105 100 90 (mV) (mV) (mV) 75 75 100 SENSE SENSE SENSE V V 60 V 50 45 75 30 25 15 0 0 50 0 20 40 60 80 100 0 20 40 60 80 100 0 1 2 3 4 5 6 DUTY FACTOR (%) PERCENT OF NOMINAL OUTPUT VOLTAGE (%) VRUN/SS (V) 3727 G07 3727 G08 3727 G09
Current Sense Threshold vs ITH Voltage Load Regulation VITH vs VRUN/SS
150 0.0 2.5 FCB = 0V VOSENSE = 0.7V 125 VIN = 15V FIGURE 1 2.0 100 –0.1 (%) 75 OUT 1.5 (mV) (V) 50 –0.2 ITHV SENSEV 25 1.0 0 NORMALIZED V –0.3 0.5 –25 –50 –0.4 0 0 0.5 1.0 1.5 2.0 2.5 0 1 2 3 4 5 0 1 2 3 4 5 6 VITH (V) LOAD CURRENT (A) VRUN/SS (V) 3727 G10 3727 G11 3727 G12 3727a1fa 5
