Datasheet LTC3445 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | I²C Controllable Buck Regulator with Two LDOs in a 4mm × 4mm QFN |
| Pages / Page | 24 / 5 — TYPICAL PERFOR A CE CHARACTERISTICS. Buck Efficiency and Power Loss. Buck … |
| File Format / Size | PDF / 486 Kb |
| Document Language | English |
TYPICAL PERFOR A CE CHARACTERISTICS. Buck Efficiency and Power Loss. Buck Output Voltage. vs Load Current, VCC1 = 2.5V
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LTC3445
W U TYPICAL PERFOR A CE CHARACTERISTICS Buck Efficiency and Power Loss Buck Efficiency and Power Loss Buck Output Voltage vs Load Current, VCC1 = 2.5V vs Load Current, V vs Load Current CC1 = 4.2V
100 1000 100 1000 0.900 DAC = MIN 90 90 EFFICIENCY EFFICIENCY 80 80 100 DAC MAX DAC MIN POWER LOSS (mW) DAC MIN 100 POWER LOSS (mW) 0.850 70 DAC MAX 70 60 60 50 10 50 10 0.800 DAC MAX 40 40 EFFICIENCY (%) POWER LOSS EFFICIENCY (%) 30 30 BUCK OUTPUT (V) 1.0 POWER LOSS 1.0 DAC MAX 0.750 20 20 DAC MIN 10 10 DAC MIN 0 0.1 0 0.1 0.700 0.1 1 10 100 1000 0.1 1 10 100 1000 –100 100 300 500 700 900 LOAD CURRENT (mA) LOAD CURRENT (mA) LOAD CURRENT (mA) 3445 G04 3445 G05 3445 G06
Buck Output Voltage vs Load Current IVCC2 vs Temperature (RUN = VCC1) IVCC2 vs Temperature (RUN = 0V)
1.580 1.2 1.2 DAC = MAX VCC2 = 2.5V VCC2 = 2.5V VCC2 = 3.6V VCC2 = 3.6V 1.560 1.0 VCC2 = 4.2V 1.0 VCC2 = 4.2V µA) VCC2 = 5.5V µA) VCC2 = 5.5V 1.540 0.8 0.8 1.520 0.6 0.6 BUCK OUTPUT (V) 1.500 0.4 0.4 LEAKAGE CURRENT ( LEAKAGE CURRENT ( CC2 CC2 V V 1.480 0.2 0.2 1.460 0 0 –100 100 300 500 700 900 –50 –10 30 70 110 150 –50 –10 30 70 110 150 LOAD CURRENT (mA) TEMPERATURE (°C) TEMPERATURE (°C) 3445 G07 3445 G08 3445 G09
Synchronous Switch RDS(ON) Main Switch RDS(ON) RDS(ON) vs Input Voltage vs Temperature vs Temperature
600 700 800 VCC1 = 2.5V VCC1 = 2.5V V V 550 CC1 = 3.6V CC1 = 3.6V V V 600 CC1 = 4.2V CC1 = 4.2V V 700 CC1 = 5.5V VCC1 = 5.5V 500 ) MAIN SWITCH ) Ω Ω 500 Ω 600 450 (m (m (m 400 DS(ON) DS(ON) 400 DS(ON) 500 R R R SYNCHRONOUS SWITCH 350 300 400 300 250 200 300 2.2 2.6 3 3.4 3.8 4.2 4.6 5 5.4 5.8 –40 –20 0 20 40 60 80 100 120 140 –40 –20 0 20 40 60 80 100 120 140 INPUT VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 3445 G10 3445 G11 3445 G12 3445fa 5
W U TYPICAL PERFOR A CE CHARACTERISTICS Buck Efficiency and Power Loss Buck Efficiency and Power Loss Buck Output Voltage vs Load Current, VCC1 = 2.5V vs Load Current, V vs Load Current CC1 = 4.2V
100 1000 100 1000 0.900 DAC = MIN 90 90 EFFICIENCY EFFICIENCY 80 80 100 DAC MAX DAC MIN POWER LOSS (mW) DAC MIN 100 POWER LOSS (mW) 0.850 70 DAC MAX 70 60 60 50 10 50 10 0.800 DAC MAX 40 40 EFFICIENCY (%) POWER LOSS EFFICIENCY (%) 30 30 BUCK OUTPUT (V) 1.0 POWER LOSS 1.0 DAC MAX 0.750 20 20 DAC MIN 10 10 DAC MIN 0 0.1 0 0.1 0.700 0.1 1 10 100 1000 0.1 1 10 100 1000 –100 100 300 500 700 900 LOAD CURRENT (mA) LOAD CURRENT (mA) LOAD CURRENT (mA) 3445 G04 3445 G05 3445 G06
Buck Output Voltage vs Load Current IVCC2 vs Temperature (RUN = VCC1) IVCC2 vs Temperature (RUN = 0V)
1.580 1.2 1.2 DAC = MAX VCC2 = 2.5V VCC2 = 2.5V VCC2 = 3.6V VCC2 = 3.6V 1.560 1.0 VCC2 = 4.2V 1.0 VCC2 = 4.2V µA) VCC2 = 5.5V µA) VCC2 = 5.5V 1.540 0.8 0.8 1.520 0.6 0.6 BUCK OUTPUT (V) 1.500 0.4 0.4 LEAKAGE CURRENT ( LEAKAGE CURRENT ( CC2 CC2 V V 1.480 0.2 0.2 1.460 0 0 –100 100 300 500 700 900 –50 –10 30 70 110 150 –50 –10 30 70 110 150 LOAD CURRENT (mA) TEMPERATURE (°C) TEMPERATURE (°C) 3445 G07 3445 G08 3445 G09
Synchronous Switch RDS(ON) Main Switch RDS(ON) RDS(ON) vs Input Voltage vs Temperature vs Temperature
600 700 800 VCC1 = 2.5V VCC1 = 2.5V V V 550 CC1 = 3.6V CC1 = 3.6V V V 600 CC1 = 4.2V CC1 = 4.2V V 700 CC1 = 5.5V VCC1 = 5.5V 500 ) MAIN SWITCH ) Ω Ω 500 Ω 600 450 (m (m (m 400 DS(ON) DS(ON) 400 DS(ON) 500 R R R SYNCHRONOUS SWITCH 350 300 400 300 250 200 300 2.2 2.6 3 3.4 3.8 4.2 4.6 5 5.4 5.8 –40 –20 0 20 40 60 80 100 120 140 –40 –20 0 20 40 60 80 100 120 140 INPUT VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 3445 G10 3445 G11 3445 G12 3445fa 5
