Datasheet LTC3520 (Analog Devices) - 4
| Fabricante | Analog Devices |
| Descripción | Synchronous 1A Buck-Boost and 600mA Buck Converters |
| Páginas / Página | 24 / 4 — ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply … |
| Formato / tamaño de archivo | PDF / 324 Kb |
| Idioma del documento | Inglés |
ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply over the full operating
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LTC3520
ELECTRICAL CHARACTERISTICS The
l
denotes the specifi cations which apply over the full operating junction temperature range, otherwise specifi cations are at TA = 25°C, VIN = 3.6V, VOUT1 = 3.3V, VOUT2 = 1.8V, RT = 54.9k, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
Propagation Delay AOUT Falling 11 μs SD3 Input High Voltage 1.4 V SD3 Input Low Voltage 0.4 V SD3 Input Current 0.01 1 μA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 3:
Current measurements are performed when the LTC3520 is not may cause permanent damage to the device. Exposure to any Absolute switching. The current limit values in operation will be somewhat higher Maximum Rating condition for extended periods may affect device due to the propagation delay of the comparators. reliability and lifetime.
Note 4:
The LTC3520 is tested in a proprietary non-switching test mode
Note 2:
The LTC3520E is guaranteed to meet performance specifi cations that internally connects the FB2 pin to the output of the buck converter from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating error amplifi er. junction temperature range are assured by design, characterization and
Note 5:
This IC includes overtemperature protection that is intended correlation with statistical process controls. The LTC3520I is guaranteed to protect the device during momentary overload conditions. Junction to meet performance specifi cations over the full –40°C to 125°C operating temperature will exceed 125°C when overtemperature protection is active. junction temperature range. Continuous operation above the specifi ed maximum operating junction temperature may impair device reliability.
TYPICAL PERFORMANCE CHARACTERISTICS (TA = 25°C, unless otherwise specifi ed) Buck-Boost Effi ciency Buck Effi ciency Lithium-Ion to 3.3V Lithium-Ion to 2.7V
100 300 100 800 VIN = 4.2V 90 V 90 Burst Mode OPERATION IN = 2.7V PWM MODE 700 250 80 80 POWER LOSS (mW) 600 POWER LOSS (mW) 70 Burst Mode 70 OPERATION 200 500 60 60 PWM MODE 50 150 50 400 40 40 300 EFFICIENCY (%) Burst Mode 100 EFFICIENCY (%) 30 OPERATION 30 Burst Mode POWER LOSS 200 20 20 OPERATION 50 POWER LOSS L = SUMIDA 100 10 L = COILCRAFT 10 MSS6132-4.7μH CDRH3D16NP-4R7N 0 0 0 0 1 10 100 1000 1 10 100 1000 LOAD CURRENT (mA) LOAD CURRENT (mA) 3520 G01 3520 G02 3520fa 4
ELECTRICAL CHARACTERISTICS The
l
denotes the specifi cations which apply over the full operating junction temperature range, otherwise specifi cations are at TA = 25°C, VIN = 3.6V, VOUT1 = 3.3V, VOUT2 = 1.8V, RT = 54.9k, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
Propagation Delay AOUT Falling 11 μs SD3 Input High Voltage 1.4 V SD3 Input Low Voltage 0.4 V SD3 Input Current 0.01 1 μA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 3:
Current measurements are performed when the LTC3520 is not may cause permanent damage to the device. Exposure to any Absolute switching. The current limit values in operation will be somewhat higher Maximum Rating condition for extended periods may affect device due to the propagation delay of the comparators. reliability and lifetime.
Note 4:
The LTC3520 is tested in a proprietary non-switching test mode
Note 2:
The LTC3520E is guaranteed to meet performance specifi cations that internally connects the FB2 pin to the output of the buck converter from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating error amplifi er. junction temperature range are assured by design, characterization and
Note 5:
This IC includes overtemperature protection that is intended correlation with statistical process controls. The LTC3520I is guaranteed to protect the device during momentary overload conditions. Junction to meet performance specifi cations over the full –40°C to 125°C operating temperature will exceed 125°C when overtemperature protection is active. junction temperature range. Continuous operation above the specifi ed maximum operating junction temperature may impair device reliability.
TYPICAL PERFORMANCE CHARACTERISTICS (TA = 25°C, unless otherwise specifi ed) Buck-Boost Effi ciency Buck Effi ciency Lithium-Ion to 3.3V Lithium-Ion to 2.7V
100 300 100 800 VIN = 4.2V 90 V 90 Burst Mode OPERATION IN = 2.7V PWM MODE 700 250 80 80 POWER LOSS (mW) 600 POWER LOSS (mW) 70 Burst Mode 70 OPERATION 200 500 60 60 PWM MODE 50 150 50 400 40 40 300 EFFICIENCY (%) Burst Mode 100 EFFICIENCY (%) 30 OPERATION 30 Burst Mode POWER LOSS 200 20 20 OPERATION 50 POWER LOSS L = SUMIDA 100 10 L = COILCRAFT 10 MSS6132-4.7μH CDRH3D16NP-4R7N 0 0 0 0 1 10 100 1000 1 10 100 1000 LOAD CURRENT (mA) LOAD CURRENT (mA) 3520 G01 3520 G02 3520fa 4