Datasheet LTC3548A (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | Dual Synchronous 400mA/800mA, 2.25MHz Step-Down DC/DC Regulator |
| Pages / Page | 20 / 5 — TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise specifi ed. … |
| File Format / Size | PDF / 255 Kb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise specifi ed. Reference Voltage vs Temperature
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LTC3548A
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise specifi ed. Reference Voltage vs Temperature RDS(ON) vs Input Voltage RDS(ON) vs Temperature
0.615 500 550 V V IN = 3.6V IN = 2.7V 500 0.610 450 VIN = 3.6V 450 VIN = 4.2V 0.605 400 400 MAIN (mΩ) SWITCH 350 (mΩ) 0.600 350 300 DS(ON) DS(ON) R R 0.595 300 250 REFERENCE VOLTAGE (V) SYNCHRONOUS 200 SWITCH 0.590 250 150 MAIN SWITCH SYNCHRONOUS SWITCH 0.585 200 100 –50 –25 0 25 50 75 100 125 1 2 3 4 5 6 7 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) VIN (V) TEMPERATURE (°C) 3548A G08 3548A G09 3548A G10
Efficiency vs Load Current Efficiency vs Load Current Load Regulation
100 100 4 2.7V 90 90 Burst Mode OPERATION 3 4.2V 80 3.3V 80 2 70 70 Burst Mode OPERATION 60 60 1 PULSE-SKIPPING MODE 50 50 0 ERROR(%) PULSE-SKIPPING MODE 40 40 OUT –1 EFFICIENCY (%) EFFICIENCY (%) V 30 30 –2 20 V 20 OUT = 2.5V VIN = 3.6V VIN = 3.6V –3 10 Burst Mode OPERATION 10 VOUT = 1.8V VOUT = 1.8V FIGURE 3 CIRCUIT NO LOAD ON OTHER CHANNEL NO LOAD ON OTHER CHANNEL 0 0 –4 1 10 100 1000 1 10 100 1000 1 10 100 1000 LOAD CURRENT (mA) LOAD CURRENT (mA) LOAD CURRENT (mA) 3548A G11 3548A G12 3548A G13
Efficiency vs Load Current Efficiency vs Load Current Line Regulation
100 100 0.5 3.3V VOUT = 1.8V 90 90 3.3V 0.4 IOUT = 200mA 2.7V 2.7V 80 80 0.3 4.2V 4.2V 70 70 0.2 60 60 0.1 50 50 0 ERROR (%) 40 40 –0.1 EFFICIENCY (%) EFFICIENCY (%) OUTV 30 30 –0.2 20 20 –0.3 10 VOUT = 1.2V 10 VOUT = 1.5V –0.4 Burst Mode OPERATION Burst Mode OPERATION 0 0 –0.5 1 10 100 1000 1 10 100 1000 2 3 4 5 6 LOAD CURRENT (mA) LOAD CURRENT (mA) VIN (V) 3548A G14 3548A G15 3548A G16 3548afa 5
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise specifi ed. Reference Voltage vs Temperature RDS(ON) vs Input Voltage RDS(ON) vs Temperature
0.615 500 550 V V IN = 3.6V IN = 2.7V 500 0.610 450 VIN = 3.6V 450 VIN = 4.2V 0.605 400 400 MAIN (mΩ) SWITCH 350 (mΩ) 0.600 350 300 DS(ON) DS(ON) R R 0.595 300 250 REFERENCE VOLTAGE (V) SYNCHRONOUS 200 SWITCH 0.590 250 150 MAIN SWITCH SYNCHRONOUS SWITCH 0.585 200 100 –50 –25 0 25 50 75 100 125 1 2 3 4 5 6 7 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) VIN (V) TEMPERATURE (°C) 3548A G08 3548A G09 3548A G10
Efficiency vs Load Current Efficiency vs Load Current Load Regulation
100 100 4 2.7V 90 90 Burst Mode OPERATION 3 4.2V 80 3.3V 80 2 70 70 Burst Mode OPERATION 60 60 1 PULSE-SKIPPING MODE 50 50 0 ERROR(%) PULSE-SKIPPING MODE 40 40 OUT –1 EFFICIENCY (%) EFFICIENCY (%) V 30 30 –2 20 V 20 OUT = 2.5V VIN = 3.6V VIN = 3.6V –3 10 Burst Mode OPERATION 10 VOUT = 1.8V VOUT = 1.8V FIGURE 3 CIRCUIT NO LOAD ON OTHER CHANNEL NO LOAD ON OTHER CHANNEL 0 0 –4 1 10 100 1000 1 10 100 1000 1 10 100 1000 LOAD CURRENT (mA) LOAD CURRENT (mA) LOAD CURRENT (mA) 3548A G11 3548A G12 3548A G13
Efficiency vs Load Current Efficiency vs Load Current Line Regulation
100 100 0.5 3.3V VOUT = 1.8V 90 90 3.3V 0.4 IOUT = 200mA 2.7V 2.7V 80 80 0.3 4.2V 4.2V 70 70 0.2 60 60 0.1 50 50 0 ERROR (%) 40 40 –0.1 EFFICIENCY (%) EFFICIENCY (%) OUTV 30 30 –0.2 20 20 –0.3 10 VOUT = 1.2V 10 VOUT = 1.5V –0.4 Burst Mode OPERATION Burst Mode OPERATION 0 0 –0.5 1 10 100 1000 1 10 100 1000 2 3 4 5 6 LOAD CURRENT (mA) LOAD CURRENT (mA) VIN (V) 3548A G14 3548A G15 3548A G16 3548afa 5
