Datasheet LTC3736-2 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | Dual 2-Phase, No RSENSE , Synchronous Controller with Output Tracking |
| Pages / Page | 28 / 5 — TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. … |
| File Format / Size | PDF / 357 Kb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Tracking Start-Up with External
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LTC3736-2
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Tracking Start-Up with External Oscillator Frequency Maximum Current Sense Voltage Soft-Start (CSS = 0.10μF) vs Input Voltage vs ITH Pin Voltage
5 100 FORCED CONTINUOUS VOUT1 4 MODE 2.5V 80 PULSE-SKIPPING 3 MODE 2 60 500mV/ VOUT2 1 DIV 1.8V 0 40 –1 20 –2 CURRENT LIMIT (%) –3 V 0 IN = 5V 40ms/DIV 37362 G07 NORMALIZED FREQUENCY SHIFT (%) R –4 LOAD1 = RLOAD2 = 1Ω FIGURE 15 CIRCUIT –5 –20 2 3 4 5 6 7 8 9 10 0.5 1 1.5 2 INPUT VOLTAGE (V) ITH VOLTAGE (V) 37368 G08 37362 G09
Regulated Feedback Voltage Shutdown (RUN) Threshold Effi ciency vs Load Current vs Temperature vs Temperature
100 0.606 1.0 FIGURE 15 CIRCUIT 95 V 0.605 IN = 3.3V 0.9 V 90 OUT = 2.5V 0.604 0.8 0.603 85 0.7 PULSE-SKIPPING 0.602 80 MODE 0.601 0.6 75 (SYNC/FCB = VIN) 0.600 0.5 70 0.599 0.4 EFFICIENCY (%) 65 0.598 RUN/SS VOLTAGE (V) 0.3 FORCED FEEDBACK VOLTAGE (V) 0.597 60 CONTINUOUS 0.2 0.596 55 (SYNC/FCB = 0V) 0.1 0.595 50 0.594 0 1 10 100 1000 10000 –60 –40 –20 0 20 40 60 80 100 –60 –40 –20 0 20 40 60 80 100 LOAD CURRENT (mA) TEMPERATURE (°C) TEMPERATURE (°C) 37362 G10 37362 G11 37362 G12
RUN/SS Pull-Up Current Maximum Current Sense Threshold Oscillator Frequency vs Temperature vs Temperature vs Temperature
1.0 180 10 IPRG = GND 8 0.9 175 6 4 0.8 170 2 0.7 165 0 –2 0.6 160 –4 –6 RUN/SS PULL-UP CURRENT (μA) 0.5 155 NROMALIZED FREQUENCY (%) –8 0.4 MAXIMUM CURRENT SENSE THRESHOLD (mV) 150 –10 –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) 37362 G13 37362 G14 37362 G15 37362fb 5
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Tracking Start-Up with External Oscillator Frequency Maximum Current Sense Voltage Soft-Start (CSS = 0.10μF) vs Input Voltage vs ITH Pin Voltage
5 100 FORCED CONTINUOUS VOUT1 4 MODE 2.5V 80 PULSE-SKIPPING 3 MODE 2 60 500mV/ VOUT2 1 DIV 1.8V 0 40 –1 20 –2 CURRENT LIMIT (%) –3 V 0 IN = 5V 40ms/DIV 37362 G07 NORMALIZED FREQUENCY SHIFT (%) R –4 LOAD1 = RLOAD2 = 1Ω FIGURE 15 CIRCUIT –5 –20 2 3 4 5 6 7 8 9 10 0.5 1 1.5 2 INPUT VOLTAGE (V) ITH VOLTAGE (V) 37368 G08 37362 G09
Regulated Feedback Voltage Shutdown (RUN) Threshold Effi ciency vs Load Current vs Temperature vs Temperature
100 0.606 1.0 FIGURE 15 CIRCUIT 95 V 0.605 IN = 3.3V 0.9 V 90 OUT = 2.5V 0.604 0.8 0.603 85 0.7 PULSE-SKIPPING 0.602 80 MODE 0.601 0.6 75 (SYNC/FCB = VIN) 0.600 0.5 70 0.599 0.4 EFFICIENCY (%) 65 0.598 RUN/SS VOLTAGE (V) 0.3 FORCED FEEDBACK VOLTAGE (V) 0.597 60 CONTINUOUS 0.2 0.596 55 (SYNC/FCB = 0V) 0.1 0.595 50 0.594 0 1 10 100 1000 10000 –60 –40 –20 0 20 40 60 80 100 –60 –40 –20 0 20 40 60 80 100 LOAD CURRENT (mA) TEMPERATURE (°C) TEMPERATURE (°C) 37362 G10 37362 G11 37362 G12
RUN/SS Pull-Up Current Maximum Current Sense Threshold Oscillator Frequency vs Temperature vs Temperature vs Temperature
1.0 180 10 IPRG = GND 8 0.9 175 6 4 0.8 170 2 0.7 165 0 –2 0.6 160 –4 –6 RUN/SS PULL-UP CURRENT (μA) 0.5 155 NROMALIZED FREQUENCY (%) –8 0.4 MAXIMUM CURRENT SENSE THRESHOLD (mV) 150 –10 –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) 37362 G13 37362 G14 37362 G15 37362fb 5
