Datasheet LTC3737 (Analog Devices) - 4
| Manufacturer | Analog Devices |
| Description | Dual 2-Phase, No RSENSE DC/DC Controller with Output Tracking |
| Pages / Page | 24 / 4 — TYPICAL PERFOR A CE CHARACTERISTICS. Efficiency vs Load Current. Load … |
| File Format / Size | PDF / 282 Kb |
| Document Language | English |
TYPICAL PERFOR A CE CHARACTERISTICS. Efficiency vs Load Current. Load Step (Burst Mode Operation)
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LTC3737
W U TYPICAL PERFOR A CE CHARACTERISTICS Efficiency vs Load Current Efficiency vs Load Current Load Step (Burst Mode Operation)
100 100 Burst Mode OPERATION TA = 25°C 95 (SYNC/MODE = V 95 IN) VOUT = 2.5V VIN = 3.3V VOUT 90 90 AC-COUPLED 100mV/DIV 85 85 VIN = 4.2V 80 80 VIN = 5V PULSE SKIPPING 75 (SYNC/MODE = 0V) 75 IL 70 70 2A/DIV EFFICIENCY (%) EFFICIENCY (%) 65 65 T 60 A = 25°C 60 VIN = 3.3V V 55 V IN = 3.3V 200µs/DIV 3737 G03 OUT = 2.5V 55 V FIGURE 13 CIRCUIT OUT = 1.8V 50 50 ILOAD = 300mA TO 3A 1 10 100 1000 10000 1 10 100 1000 10000 SYNC/MODE = VIN LOAD CURRENT (mA) LOAD CURRENT (mA) FIGURE 13 CIRCUIT 3737 G01 3737 G02
Tracking Start-Up with Internal Tracking Start-Up with External Load Step (Pulse Skipping Mode) Soft-Start (CSS = 0nF) Soft-Start (CSS = 10nF)
VOUT1 VOUT1 V 2.5V OUT 2.5V AC-COUPLED VOUT2 VOUT2 100mV/DIV 1.8V 1.8V 500mV/ 500mV/ DIV DIV IL 2A/DIV VIN = 3.3V 200µs/DIV 3737 G04 VIN = 4.2V 250µs/DIV 3737 G05 VIN = 4.2V 2.5ms/DIV 3737 G06 VOUT = 1.8V RLOAD1 = RLOAD2 = 1Ω RLOAD1 = RLOAD2 = 1Ω ILOAD = 300mA TO 3A FIGURE 13 CIRCUIT FIGURE 13 CIRCUIT SYNC/MODE = 0V FIGURE 13 CIRCUIT
Regulated Feedback Voltage Maximum Current Sense Threshold Shutdown (RUN) Threshold vs Temperature vs Temperature vs Temperature
0.609 135 1.0 IPRG = FLOAT 0.607 0.9 0.8 0.605 130 0.7 0.603 0.6 0.601 125 0.5 0.599 0.4 0.597 0.3 FEEDBACK VOLTAGE (V) 120 RUN/SS VOLTAGE (V) 0.595 0.2 0.593 0.1 0.591 MAXIMUM CURRENT SENSE THRESHOLD (mV) 115 0 –60 –40 –20 0 20 40 60 80 100 –60 –40 –20 0 20 40 60 80 100 –60 –40 –20 0 20 40 60 80 100 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3737 G07 3737 G08 3737 G09 3737fa 4
W U TYPICAL PERFOR A CE CHARACTERISTICS Efficiency vs Load Current Efficiency vs Load Current Load Step (Burst Mode Operation)
100 100 Burst Mode OPERATION TA = 25°C 95 (SYNC/MODE = V 95 IN) VOUT = 2.5V VIN = 3.3V VOUT 90 90 AC-COUPLED 100mV/DIV 85 85 VIN = 4.2V 80 80 VIN = 5V PULSE SKIPPING 75 (SYNC/MODE = 0V) 75 IL 70 70 2A/DIV EFFICIENCY (%) EFFICIENCY (%) 65 65 T 60 A = 25°C 60 VIN = 3.3V V 55 V IN = 3.3V 200µs/DIV 3737 G03 OUT = 2.5V 55 V FIGURE 13 CIRCUIT OUT = 1.8V 50 50 ILOAD = 300mA TO 3A 1 10 100 1000 10000 1 10 100 1000 10000 SYNC/MODE = VIN LOAD CURRENT (mA) LOAD CURRENT (mA) FIGURE 13 CIRCUIT 3737 G01 3737 G02
Tracking Start-Up with Internal Tracking Start-Up with External Load Step (Pulse Skipping Mode) Soft-Start (CSS = 0nF) Soft-Start (CSS = 10nF)
VOUT1 VOUT1 V 2.5V OUT 2.5V AC-COUPLED VOUT2 VOUT2 100mV/DIV 1.8V 1.8V 500mV/ 500mV/ DIV DIV IL 2A/DIV VIN = 3.3V 200µs/DIV 3737 G04 VIN = 4.2V 250µs/DIV 3737 G05 VIN = 4.2V 2.5ms/DIV 3737 G06 VOUT = 1.8V RLOAD1 = RLOAD2 = 1Ω RLOAD1 = RLOAD2 = 1Ω ILOAD = 300mA TO 3A FIGURE 13 CIRCUIT FIGURE 13 CIRCUIT SYNC/MODE = 0V FIGURE 13 CIRCUIT
Regulated Feedback Voltage Maximum Current Sense Threshold Shutdown (RUN) Threshold vs Temperature vs Temperature vs Temperature
0.609 135 1.0 IPRG = FLOAT 0.607 0.9 0.8 0.605 130 0.7 0.603 0.6 0.601 125 0.5 0.599 0.4 0.597 0.3 FEEDBACK VOLTAGE (V) 120 RUN/SS VOLTAGE (V) 0.595 0.2 0.593 0.1 0.591 MAXIMUM CURRENT SENSE THRESHOLD (mV) 115 0 –60 –40 –20 0 20 40 60 80 100 –60 –40 –20 0 20 40 60 80 100 –60 –40 –20 0 20 40 60 80 100 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3737 G07 3737 G08 3737 G09 3737fa 4
