Datasheet LTC3520 (Analog Devices) - 6
| Manufacturer | Analog Devices |
| Description | Synchronous 1A Buck-Boost and 600mA Buck Converters |
| Pages / Page | 24 / 6 — TYPICAL PERFORMANCE CHARACTERISTICS. Buck Burst Mode Threshold. OUT = … |
| File Format / Size | PDF / 324 Kb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Buck Burst Mode Threshold. OUT = 1.8V. OUT = 1.2V. Buck-Boost RDS(ON). Buck RDS(ON)
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LTC3520
TYPICAL PERFORMANCE CHARACTERISTICS Buck Burst Mode Threshold Buck Burst Mode Threshold V V OUT = 1.8V OUT = 1.2V Buck-Boost RDS(ON)
45 45 250 L = 4.7μH L = 3.3μH PMOS 40 40 (SWITCHES A AND D) 35 35 200 30 30 RBURST 150 25 = 274k 25 RBURST = 249k NMOS (mΩ) RBURST = 249k (SWITCHES B AND C) 20 20 DS(ON) 100 R 15 15 RBURST = 301k OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) 10 10 R 50 BURST = 301k 5 5 0 0 0 2.2 2.7 3.2 3.7 4.2 4.7 5.2 2.2 2.7 3.2 3.7 4.2 4.7 5.2 –45 –25 –5 15 35 55 75 VIN (V) VIN (V) TEMPERATURE (°C) 3520 G09 3520 G10 3520 G09b
Buck RDS(ON) Switching Frequency Buck-Boost Feedback Voltage
400 2.0 1.0 0.8 350 1.5 PMOS 0.6 300 1.0 0.4 250 0.5 0.2 (mΩ) 200 NMOS 0 0 DS(ON) –0.2 R 150 –0.5 –0.4 100 –1.0 CHANGE FROM T = 25°C (%) –0.6 50 –1.5 –0.8 0 –2.0 –1.0 –45 –25 –5 15 35 55 75 SWITCHING FREQUENCY, CHANGE FROM 25°C (%) –45 –25 –5 15 35 55 75 –40 –20 0 20 40 60 80 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3520 G11 3520 G12 3520 G13
Buck Output Voltage vs Buck Feedback Voltage No Load Input Current Load Current
1.0 100 3 0.8 90 TA = 125°C 2 0.6 80 0.4 70 1 TA = 85°C 0.2 60 TA = –40°C, 25°C 0 50 0 –0.2 40 TAGE FROM 100mA LOAD (%) –1 –0.4 30 NO LOAD CURRENT (μA) CHANGE FROM T = 25°C (%) –0.6 20 BUCK AND BUCK-BOOST –2 –0.8 10 CONVERTERS ENABLED, Burst Mode OPERATION –1.0 CHANGE IN VOL 0 –3 –40 –20 0 20 40 60 80 2.2 2.7 3.2 3.7 4.2 4.7 5.2 0 200 400 600 TEMPERATURE (°C) VIN (V) LOAD CURRENT (mA) 3520 G14 3520 G15 3520 G23 3520fa 6
TYPICAL PERFORMANCE CHARACTERISTICS Buck Burst Mode Threshold Buck Burst Mode Threshold V V OUT = 1.8V OUT = 1.2V Buck-Boost RDS(ON)
45 45 250 L = 4.7μH L = 3.3μH PMOS 40 40 (SWITCHES A AND D) 35 35 200 30 30 RBURST 150 25 = 274k 25 RBURST = 249k NMOS (mΩ) RBURST = 249k (SWITCHES B AND C) 20 20 DS(ON) 100 R 15 15 RBURST = 301k OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) 10 10 R 50 BURST = 301k 5 5 0 0 0 2.2 2.7 3.2 3.7 4.2 4.7 5.2 2.2 2.7 3.2 3.7 4.2 4.7 5.2 –45 –25 –5 15 35 55 75 VIN (V) VIN (V) TEMPERATURE (°C) 3520 G09 3520 G10 3520 G09b
Buck RDS(ON) Switching Frequency Buck-Boost Feedback Voltage
400 2.0 1.0 0.8 350 1.5 PMOS 0.6 300 1.0 0.4 250 0.5 0.2 (mΩ) 200 NMOS 0 0 DS(ON) –0.2 R 150 –0.5 –0.4 100 –1.0 CHANGE FROM T = 25°C (%) –0.6 50 –1.5 –0.8 0 –2.0 –1.0 –45 –25 –5 15 35 55 75 SWITCHING FREQUENCY, CHANGE FROM 25°C (%) –45 –25 –5 15 35 55 75 –40 –20 0 20 40 60 80 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3520 G11 3520 G12 3520 G13
Buck Output Voltage vs Buck Feedback Voltage No Load Input Current Load Current
1.0 100 3 0.8 90 TA = 125°C 2 0.6 80 0.4 70 1 TA = 85°C 0.2 60 TA = –40°C, 25°C 0 50 0 –0.2 40 TAGE FROM 100mA LOAD (%) –1 –0.4 30 NO LOAD CURRENT (μA) CHANGE FROM T = 25°C (%) –0.6 20 BUCK AND BUCK-BOOST –2 –0.8 10 CONVERTERS ENABLED, Burst Mode OPERATION –1.0 CHANGE IN VOL 0 –3 –40 –20 0 20 40 60 80 2.2 2.7 3.2 3.7 4.2 4.7 5.2 0 200 400 600 TEMPERATURE (°C) VIN (V) LOAD CURRENT (mA) 3520 G14 3520 G15 3520 G23 3520fa 6
