Datasheet LTC3834-1 (Analog Devices) - 4
| Hersteller | Analog Devices |
| Beschreibung | 30μA IQ Synchronous Step-Down Controller |
| Seiten / Seite | 28 / 4 — TYPICAL PERFOR A CE CHARACTERISTICS TA = 25ºC, unless otherwise noted. … |
| Dateiformat / Größe | PDF / 300 Kb |
| Dokumentensprache | Englisch |
TYPICAL PERFOR A CE CHARACTERISTICS TA = 25ºC, unless otherwise noted. Efficiency and Power Loss vs Output Current
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LTC3834-1
W U TYPICAL PERFOR A CE CHARACTERISTICS TA = 25ºC, unless otherwise noted. Efficiency and Power Loss vs Output Current Efficiency vs Load Current Efficiency vs Input Voltage
100 10000 Burst Mode OPERATION 100 98 VIN = 12V 90 FORCED CONTINUOUS MODE VIN = 5V 96 PULSE SKIPPING MODE 90 80 1000 V V OUT = 3.3V IN = 12V 94 POWER LOSS (mW) 70 VOUT = 3.3V 80 92 60 100 90 50 70 88 40 10 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) 86 30 60 20 1 84 50 VOUT = 3.3V 10 82 FIGURE 10 CIRCUIT FIGURE 10 CIRCUIT FIGURE 10 CIRCUIT 0 0.1 40 80 0.000001 0.0001 0.01 1 0.000001 0.0001 0.01 1 0 5 10 15 20 25 30 35 40 OUTPUT CURRENT (A) OUTPUT CURRENT (A) INPUT VOLTAGE (V) 38341 G01 38341 G02 38341 G03
Load Step (Forced Continuous Load Step (Burst Mode Operation) Mode) Load Step (Pulse Skipping Mode)
VOUT VOUT VOUT 100mV/DIV 100mV/DIV 100mV/DIV AC AC AC COUPLED COUPLED COUPLED IL IL IL 2A/DIV 2A/DIV 2A/DIV 38341 G04 20μs/DIV 38341 G05 20μs/DIV 38341 G06 20μs/DIV VOUT = 3.3V VOUT = 3.3V VOUT = 3.3V FIGURE 10 CIRCUIT FIGURE 10 CIRCUIT FIGURE 10 CIRCUIT
Inductor Current at Light Load Soft Start-Up Tracking Start-Up
MASTER FORCED 2V/DIV CONTINUOUS VOUT MODE 1V/DIV V 2A/DIV OUT 2V/DIV Burst Mode OPERATION PULSE SKIPPING MODE 38341 G07 2μs/DIV 38341 G08 20ms/DIV 38341 G09 20ms/DIV V FIGURE 10 CIRCUIT FIGURE 10 CIRCUIT OUT = 3.3V ILOAD = 100μA FIGURE 10 CIRCUIT 38341f 4
W U TYPICAL PERFOR A CE CHARACTERISTICS TA = 25ºC, unless otherwise noted. Efficiency and Power Loss vs Output Current Efficiency vs Load Current Efficiency vs Input Voltage
100 10000 Burst Mode OPERATION 100 98 VIN = 12V 90 FORCED CONTINUOUS MODE VIN = 5V 96 PULSE SKIPPING MODE 90 80 1000 V V OUT = 3.3V IN = 12V 94 POWER LOSS (mW) 70 VOUT = 3.3V 80 92 60 100 90 50 70 88 40 10 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) 86 30 60 20 1 84 50 VOUT = 3.3V 10 82 FIGURE 10 CIRCUIT FIGURE 10 CIRCUIT FIGURE 10 CIRCUIT 0 0.1 40 80 0.000001 0.0001 0.01 1 0.000001 0.0001 0.01 1 0 5 10 15 20 25 30 35 40 OUTPUT CURRENT (A) OUTPUT CURRENT (A) INPUT VOLTAGE (V) 38341 G01 38341 G02 38341 G03
Load Step (Forced Continuous Load Step (Burst Mode Operation) Mode) Load Step (Pulse Skipping Mode)
VOUT VOUT VOUT 100mV/DIV 100mV/DIV 100mV/DIV AC AC AC COUPLED COUPLED COUPLED IL IL IL 2A/DIV 2A/DIV 2A/DIV 38341 G04 20μs/DIV 38341 G05 20μs/DIV 38341 G06 20μs/DIV VOUT = 3.3V VOUT = 3.3V VOUT = 3.3V FIGURE 10 CIRCUIT FIGURE 10 CIRCUIT FIGURE 10 CIRCUIT
Inductor Current at Light Load Soft Start-Up Tracking Start-Up
MASTER FORCED 2V/DIV CONTINUOUS VOUT MODE 1V/DIV V 2A/DIV OUT 2V/DIV Burst Mode OPERATION PULSE SKIPPING MODE 38341 G07 2μs/DIV 38341 G08 20ms/DIV 38341 G09 20ms/DIV V FIGURE 10 CIRCUIT FIGURE 10 CIRCUIT OUT = 3.3V ILOAD = 100μA FIGURE 10 CIRCUIT 38341f 4