Datasheet LT8636 (Analog Devices) - 4
| Fabricante | Analog Devices |
| Descripción | 42V, 5A/7A Peak Synchronous Step-Down Silent Switcher with 2.5µA Quiescent Current |
| Páginas / Página | 26 / 4 — ELECTRICAL CHARACTERISTICS. Note 4:. Note 3:. TYPICAL PERFORMANCE … |
| Revisión | A |
| Formato / tamaño de archivo | PDF / 2.1 Mb |
| Idioma del documento | Inglés |
ELECTRICAL CHARACTERISTICS. Note 4:. Note 3:. TYPICAL PERFORMANCE CHARACTERISTICS. 12VIN to 5VOUT Efficiency
Versión de texto del documento
link to page 13 link to page 13 LT8636
ELECTRICAL CHARACTERISTICS
the ambient temperature (TA in °C) and power dissipation (PD, in Watts)
Note 4:
This IC includes overtemperature protection that is intended to according to the formula: protect the device during overload conditions. Junction temperature will T exceed 150°C when overtemperature protection is active. Continuous J = TA + (PD • θJA) where θ operation above the specified maximum operating junction temperature JA (in °C/W) is the package thermal impedance. will reduce lifetime.
Note 3:
θ values determined per JEDEC 51-7, 51-12. See the Applications Information section for information on improving the thermal resistance and for actual temperature measurements of a demo board in typical operating conditions.
TYPICAL PERFORMANCE CHARACTERISTICS 12VIN to 5VOUT Efficiency 12VIN to 3.3VOUT Efficiency vs Frequency vs Frequency
100 3.2 100 3.2 95 2.8 95 2.8 EFFICIENCY 90 2.4 90 2.4 POWER LOSS (W) EFFICIENCY POWER LOSS (W) 85 2.0 85 2.0 80 1.6 80 1.6 75 1.2 EFFICIENCY (%) 75 1.2 EFFICIENCY (%) POWER LOSS POWER LOSS 70 L = XEL6060 0.8 70 L = XEL6060 0.8 1MHz, L = 2.7µH 1MHz, L = 2.2µH 65 2MHz, L = 1.5µH 0.4 65 2MHz, L = 1µH 0.4 3MHz, L = 1µH 3MHz, L = 1µH 60 0 60 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 LOAD CURRENT (A) LOAD CURRENT (A) 8636 G01 8636 G02
Efficiency at 5VOUT Efficiency at 3.3VOUT
100 3.0 100 3.0 L = XEL6060, 2.7µH L = XEL6060, 2.2µH 95 2.7 95 2.7 90 2.4 90 2.4 EFFICIENCY 85 2.1 POWER LOSS (W) 85 EFFICIENCY 2.1 POWER LOSS (W) 80 1.8 80 1.8 75 1.5 75 1.5 70 1.2 70 1.2 EFFICIENCY (%) POWER LOSS EFFICIENCY (%) POWER LOSS 65 0.9 65 0.9 fSW = 1MHz fSW = 1MHz 60 V 0.6 60 0.6 IN = 12V VIN = 12V 55 VIN = 24V 0.3 55 VIN = 24V 0.3 VIN = 36V VIN = 36V 50 0 50 0 0 1 2 3 4 5 0 1 2 3 4 5 LOAD CURRENT (A) LOAD CURRENT (A) 8636 G03 8636 G04 Rev. A 4 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Applications Related Parts
ELECTRICAL CHARACTERISTICS
the ambient temperature (TA in °C) and power dissipation (PD, in Watts)
Note 4:
This IC includes overtemperature protection that is intended to according to the formula: protect the device during overload conditions. Junction temperature will T exceed 150°C when overtemperature protection is active. Continuous J = TA + (PD • θJA) where θ operation above the specified maximum operating junction temperature JA (in °C/W) is the package thermal impedance. will reduce lifetime.
Note 3:
θ values determined per JEDEC 51-7, 51-12. See the Applications Information section for information on improving the thermal resistance and for actual temperature measurements of a demo board in typical operating conditions.
TYPICAL PERFORMANCE CHARACTERISTICS 12VIN to 5VOUT Efficiency 12VIN to 3.3VOUT Efficiency vs Frequency vs Frequency
100 3.2 100 3.2 95 2.8 95 2.8 EFFICIENCY 90 2.4 90 2.4 POWER LOSS (W) EFFICIENCY POWER LOSS (W) 85 2.0 85 2.0 80 1.6 80 1.6 75 1.2 EFFICIENCY (%) 75 1.2 EFFICIENCY (%) POWER LOSS POWER LOSS 70 L = XEL6060 0.8 70 L = XEL6060 0.8 1MHz, L = 2.7µH 1MHz, L = 2.2µH 65 2MHz, L = 1.5µH 0.4 65 2MHz, L = 1µH 0.4 3MHz, L = 1µH 3MHz, L = 1µH 60 0 60 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 LOAD CURRENT (A) LOAD CURRENT (A) 8636 G01 8636 G02
Efficiency at 5VOUT Efficiency at 3.3VOUT
100 3.0 100 3.0 L = XEL6060, 2.7µH L = XEL6060, 2.2µH 95 2.7 95 2.7 90 2.4 90 2.4 EFFICIENCY 85 2.1 POWER LOSS (W) 85 EFFICIENCY 2.1 POWER LOSS (W) 80 1.8 80 1.8 75 1.5 75 1.5 70 1.2 70 1.2 EFFICIENCY (%) POWER LOSS EFFICIENCY (%) POWER LOSS 65 0.9 65 0.9 fSW = 1MHz fSW = 1MHz 60 V 0.6 60 0.6 IN = 12V VIN = 12V 55 VIN = 24V 0.3 55 VIN = 24V 0.3 VIN = 36V VIN = 36V 50 0 50 0 0 1 2 3 4 5 0 1 2 3 4 5 LOAD CURRENT (A) LOAD CURRENT (A) 8636 G03 8636 G04 Rev. A 4 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Applications Related Parts