Datasheet LTC3736 (Analog Devices) - 5
| Hersteller | Analog Devices |
| Beschreibung | Dual 2-Phase, No RSENSE , Synchronous Controller with Output Tracking |
| Seiten / Seite | 28 / 5 — TYPICAL PERFOR A CE CHARACTERISTICS TA = 25. C unless otherwise noted. … |
| Dateiformat / Größe | PDF / 447 Kb |
| Dokumentensprache | Englisch |
TYPICAL PERFOR A CE CHARACTERISTICS TA = 25. C unless otherwise noted. Maximum Current Sense Voltage
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LTC3736
W U TYPICAL PERFOR A CE CHARACTERISTICS TA = 25
°
C unless otherwise noted. Maximum Current Sense Voltage Regulated Feedback Voltage vs ITH Pin Voltage Efficiency vs Load Current vs Temperature
100 100 0.609 Burst Mode OPERATION Burst Mode (I 95 TH RISING) OPERATION 0.607 80 Burst Mode OPERATION (SYNC/FCB = V 90 IN) (ITH FALLING) 0.605 FORCED CONTINUOUS 85 60 MODE 0.603 PULSE SKIPPING 80 FORCED MODE 0.601 40 75 CONTINUOUS (SYNC/FCB = 0V) 0.599 70 PULSE SKIPPING 20 EFFICIENCY (%) CURRENT LIMIT (%) 65 MODE 0.597 (SYNC/FCB = 550kHz) FEEDBACK VOLTAGE (V) 60 0.595 0 FIGURE 15 CIRCUIT 55 VIN = 5V 0.593 VOUT = 2.5V –20 50 0.591 0.5 1 1.5 2 1 10 100 1000 10000 –60 –40 –20 0 20 40 60 80 100 ITH VOLTAGE (V) LOAD CURRENT (mA) TEMPERATURE (°C) 3736 G09 3736 G10 3736 G11
Shutdown (RUN) Threshold RUN/SS Pull-Up Current Maximum Current Sense Threshold vs Temperature vs Temperature vs Temperature
1.0 1.0 135 IPRG = FLOAT 0.9 A) 0.9 0.8 µ 130 0.7 0.8 0.6 0.5 0.7 125 0.4 0.6 RUN/SS VOLTAGE (V) 0.3 120 0.2 RUN/SS PULL-UP CURRENT ( 0.5 0.1 0 0.4 MAXIMUM CURRENT SENSE THRESHOLD (mV) 115 –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) 3736 G12 3736 G13 3736 G14
Oscillator Frequency Undervoltage Lockout Threshold vs Temperature vs Temperature
10 2.50 8 2.45 6 VIN RISING 2.40 4 2 2.35 0 ) VOLTAGE (V) 2.30 IN V –2 IN FALLING 2.25 –4 INPUT (V 2.20 NROMALIZED FREQUENCY (%) –6 –8 2.15 –10 2.10 –60 –40 –20 0 20 40 60 80 100 –60 –40 –20 0 20 40 60 80 100 TEMPERATURE (°C) TEMPERATURE (°C) 3736 G15 3736 G16 3736fa 5
W U TYPICAL PERFOR A CE CHARACTERISTICS TA = 25
°
C unless otherwise noted. Maximum Current Sense Voltage Regulated Feedback Voltage vs ITH Pin Voltage Efficiency vs Load Current vs Temperature
100 100 0.609 Burst Mode OPERATION Burst Mode (I 95 TH RISING) OPERATION 0.607 80 Burst Mode OPERATION (SYNC/FCB = V 90 IN) (ITH FALLING) 0.605 FORCED CONTINUOUS 85 60 MODE 0.603 PULSE SKIPPING 80 FORCED MODE 0.601 40 75 CONTINUOUS (SYNC/FCB = 0V) 0.599 70 PULSE SKIPPING 20 EFFICIENCY (%) CURRENT LIMIT (%) 65 MODE 0.597 (SYNC/FCB = 550kHz) FEEDBACK VOLTAGE (V) 60 0.595 0 FIGURE 15 CIRCUIT 55 VIN = 5V 0.593 VOUT = 2.5V –20 50 0.591 0.5 1 1.5 2 1 10 100 1000 10000 –60 –40 –20 0 20 40 60 80 100 ITH VOLTAGE (V) LOAD CURRENT (mA) TEMPERATURE (°C) 3736 G09 3736 G10 3736 G11
Shutdown (RUN) Threshold RUN/SS Pull-Up Current Maximum Current Sense Threshold vs Temperature vs Temperature vs Temperature
1.0 1.0 135 IPRG = FLOAT 0.9 A) 0.9 0.8 µ 130 0.7 0.8 0.6 0.5 0.7 125 0.4 0.6 RUN/SS VOLTAGE (V) 0.3 120 0.2 RUN/SS PULL-UP CURRENT ( 0.5 0.1 0 0.4 MAXIMUM CURRENT SENSE THRESHOLD (mV) 115 –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) 3736 G12 3736 G13 3736 G14
Oscillator Frequency Undervoltage Lockout Threshold vs Temperature vs Temperature
10 2.50 8 2.45 6 VIN RISING 2.40 4 2 2.35 0 ) VOLTAGE (V) 2.30 IN V –2 IN FALLING 2.25 –4 INPUT (V 2.20 NROMALIZED FREQUENCY (%) –6 –8 2.15 –10 2.10 –60 –40 –20 0 20 40 60 80 100 –60 –40 –20 0 20 40 60 80 100 TEMPERATURE (°C) TEMPERATURE (°C) 3736 G15 3736 G16 3736fa 5