Datasheet LTC3520 (Analog Devices) - 7
| Hersteller | Analog Devices |
| Beschreibung | Synchronous 1A Buck-Boost and 600mA Buck Converters |
| Seiten / Seite | 24 / 7 — TYPICAL PERFORMANCE CHARACTERISTICS. Buck-Boost Output Voltage vs. LDO … |
| Dateiformat / Größe | PDF / 324 Kb |
| Dokumentensprache | Englisch |
TYPICAL PERFORMANCE CHARACTERISTICS. Buck-Boost Output Voltage vs. LDO Output Voltage vs. Buck-Boost Maximum. Load Current
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LTC3520
TYPICAL PERFORMANCE CHARACTERISTICS Buck-Boost Output Voltage vs LDO Output Voltage vs Buck-Boost Maximum Load Current Load Current Output Current, PWM Mode
0.5 0.20 1800 0.4 1600 VOUT = 3.3V 0.15 0.3 TA = –40°C 1400 0.10 0.2 TA = 25°C 1200 VOUT = 5V 0.1 0.05 TA = 125°C 1000 0 0 TA = –40°C 800 TAGE FROM ZERO LOAD (%) –0.1 TA = 125°C TAGE FROM ZERO LOAD (%) –0.05 TA = 25°C 600 –0.2 OUTPUT CURRENT (mA) –0.10 400 –0.3 –0.15 200 –0.4 CHANGE IN VOL CHANGE IN VOL 0 –0.5 –0.20 0 200 400 600 800 1000 1200 0 100 200 300 2.2 2.7 3.2 3.7 4.2 4.7 5.2 LOAD CURRENT (mA) LOAD CURRENT (mA) VIN (V) 3520 G24 3520 G25 3520 G16
Buck-Boost Maximum Output Buck-Boost PWM Mode Current, Burst Mode Operation Effi ciency vs Frequency Buck Effi ciency vs Frequency
140 100 100 L = 8.2μH COILCRAFT L = 4.7μH SUMIDA 120 MSS6132 95 L = 4.7μH COILCRAFT 95 CDRH3D16NP VOUT = 3.3V MSS7341 L = 8.2μH 100 COILCRAFT 90 90 L = 2.2μH MSS6132 V SUMIDA 80 OUT = 5V L = 2.2μH CDRH3D16NP 85 COILCRAFT 85 60 1812PS EFFICIENCY (%) EFFICIENCY (%) 80 80 40 OUTPUT CURRENT (mA) V V 20 75 IN = 3.6V 75 IN = 2.5V V V OUT = 3.3V OUT = 1.8V I I LOAD = 200mA LOAD = 100mA 0 70 70 2.2 2.7 3.2 3.7 4.2 4.7 5.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 V SWITCHING FREQUENCY (MHz) SWITCHING FREQUENCY (MHz) IN (V) 3520 G17 3520 G18 3520 G19
Buck-Boost Burst Mode Operation Buck Burst Mode Operation
BUCK VOUT VOUT 50mV/DIV 50mV/DIV INDUCTOR INDUCTOR CURRENT CURRENT 200mA/DIV 200mA/DIV 3520 G21 3520 G22 20μs/DIV 10μs/DIV COUT = 22μF ILOAD = 25mA VIN = 3.6V RBURST = 249k L = 4.7μH VIN = 3.6V VOUT = 1.8V COUT = 10μF ILOAD = 10mA 3520fa 7
TYPICAL PERFORMANCE CHARACTERISTICS Buck-Boost Output Voltage vs LDO Output Voltage vs Buck-Boost Maximum Load Current Load Current Output Current, PWM Mode
0.5 0.20 1800 0.4 1600 VOUT = 3.3V 0.15 0.3 TA = –40°C 1400 0.10 0.2 TA = 25°C 1200 VOUT = 5V 0.1 0.05 TA = 125°C 1000 0 0 TA = –40°C 800 TAGE FROM ZERO LOAD (%) –0.1 TA = 125°C TAGE FROM ZERO LOAD (%) –0.05 TA = 25°C 600 –0.2 OUTPUT CURRENT (mA) –0.10 400 –0.3 –0.15 200 –0.4 CHANGE IN VOL CHANGE IN VOL 0 –0.5 –0.20 0 200 400 600 800 1000 1200 0 100 200 300 2.2 2.7 3.2 3.7 4.2 4.7 5.2 LOAD CURRENT (mA) LOAD CURRENT (mA) VIN (V) 3520 G24 3520 G25 3520 G16
Buck-Boost Maximum Output Buck-Boost PWM Mode Current, Burst Mode Operation Effi ciency vs Frequency Buck Effi ciency vs Frequency
140 100 100 L = 8.2μH COILCRAFT L = 4.7μH SUMIDA 120 MSS6132 95 L = 4.7μH COILCRAFT 95 CDRH3D16NP VOUT = 3.3V MSS7341 L = 8.2μH 100 COILCRAFT 90 90 L = 2.2μH MSS6132 V SUMIDA 80 OUT = 5V L = 2.2μH CDRH3D16NP 85 COILCRAFT 85 60 1812PS EFFICIENCY (%) EFFICIENCY (%) 80 80 40 OUTPUT CURRENT (mA) V V 20 75 IN = 3.6V 75 IN = 2.5V V V OUT = 3.3V OUT = 1.8V I I LOAD = 200mA LOAD = 100mA 0 70 70 2.2 2.7 3.2 3.7 4.2 4.7 5.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 V SWITCHING FREQUENCY (MHz) SWITCHING FREQUENCY (MHz) IN (V) 3520 G17 3520 G18 3520 G19
Buck-Boost Burst Mode Operation Buck Burst Mode Operation
BUCK VOUT VOUT 50mV/DIV 50mV/DIV INDUCTOR INDUCTOR CURRENT CURRENT 200mA/DIV 200mA/DIV 3520 G21 3520 G22 20μs/DIV 10μs/DIV COUT = 22μF ILOAD = 25mA VIN = 3.6V RBURST = 249k L = 4.7μH VIN = 3.6V VOUT = 1.8V COUT = 10μF ILOAD = 10mA 3520fa 7