Datasheet LT8645S, LT8646S (Analog Devices) - 5
| 制造商 | Analog Devices |
| 描述 | 65V, 8A Synchronous Step-Down Silent Switcher 2 with 2.5μA Quiescent Current |
| 页数 / 页 | 30 / 5 — TYPICAL PERFORMANCE CHARACTERISTICS. 12VIN to 5VOUT Efficiency. 12VIN to … |
| 修订版 | B |
| 文件格式/大小 | PDF / 2.4 Mb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS. 12VIN to 5VOUT Efficiency. 12VIN to 3.3VOUT Efficiency. vs Frequency. Efficiency at 5VOUT
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LT8645S/LT8646S
TYPICAL PERFORMANCE CHARACTERISTICS 12VIN to 5VOUT Efficiency 12VIN to 3.3VOUT Efficiency vs Frequency vs Frequency Efficiency at 5VOUT
100 4.0 100 4.0 100 4.0 EFFICIENCY 95 3.5 95 3.5 95 3.6 90 3.2 90 EFFICIENCY 3.0 90 3.0 POWER LOSS (W) EFFICIENCY POWER LOSS (W) 85 2.8 POWER LOSS (W) 85 2.5 85 2.5 fSW = 500kHz 80 L = XEL6060, 2.7µH 2.4 80 2.0 80 2.0 75 2.0 75 1.5 70 1.6 EFFICIENCY (%) 75 1.5 EFFICIENCY (%) EFFICIENCY (%) POWER LOSS POWER LOSS 65 1.2 70 L = XEL6060 1.0 70 L = XEL6060 1.0 VIN = 12V 500kHz, L = 2.7µH 500kHz, L = 2.7µH 60 V 0.8 IN = 24V 65 1MHz, L = 2.2µH 0.5 65 1MHz, L = 1.5µH 0.5 V 55 IN = 36V 0.4 2MHz, L = 1µH 2MHz, L = 0.82µH POWER LOSS VIN = 48V 60 0 60 0 50 0 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 0 1 2 3 4 5 6 7 8 LOAD CURRENT (A) LOAD CURRENT (A) LOAD CURRENT (A) 8645S G01 8645S G02 8645S G03
LT8645S Low Load Efficiency LT8646S Low Load Efficiency Efficiency at 3.3VOUT at 5VOUT at 5VOUT OUT
100 4.0 100 100 EFFICIENCY 95 3.6 90 90 90 3.2 80 80 85 2.8 POWER LOSS (W) 70 80 2.4 70 fSW = 500kHz 60 75 L = XEL6060, 2.7µH 2.0 60 50 70 1.6 EFFICIENCY (%) 50 V EFFICIENCY (%) IN = 12V V EFFICIENCY (%) IN = 12V 40 65 1.2 VIN = 24V VIN = 24V V 40 V V IN = 12V 30 IN = 36V 60 IN = 36V V 0.8 V V IN = 24V IN = 48V IN = 48V 55 V 30 IN = 36V 0.4 f 20 SW = 500kHz fSW = 500kHz POWER LOSS VIN = 48V L = WE–LHMI7050, 4.7µH L = WE–LHMI7050, 4.7µH 50 0 20 10 0 1 2 3 4 5 6 7 8 0.01 0.1 1 10 100 1000 0.1 1 10 100 1000 LOAD CURRENT (A) LOAD CURRENT (mA) LOAD CURRENT (mA) 8645S G04 8645S G05 8645S G06
LT8645S Low Load Efficiency at LT8646S Low Load Efficiency at 3.3VOUT 3.3V L OUT T8646S Low Load Efficiency at 3.3V Efficiency vs Frequency OUT
100 100 96 90 90 94 VIN = 12V 80 80 92 70 70 90 60 60 88 50 V V IN = 12V IN = 24V 50 VIN = 12V 86 EFFICIENCY (%) EFFICIENCY (%) 40 V EFFICIENCY (%) VIN = 24V IN = 24V 40 V V IN = 36V IN = 36V 84 V 30 V IN = 48V IN = 48V VOUT = 3.3V 30 f 20 f 82 I SW = 500kHz SW = 500kHz LOAD = 2A L = WE–LHMI7050, 4.7µH L = WE–LHMI7050, 4.7µH L = XEL6060, 4.7µH 20 10 80 0.01 0.1 1 10 100 1000 0.1 1 10 100 1000 0.4 0.7 1 1.3 1.6 1.9 2.2 LOAD CURRENT (mA) LOAD CURRENT (mA) SWITCHING FREQUENCY (MHz) 8645S G07 8645S G08 8645S G09 Rev. B For more information www.analog.com 5 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Applications Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS 12VIN to 5VOUT Efficiency 12VIN to 3.3VOUT Efficiency vs Frequency vs Frequency Efficiency at 5VOUT
100 4.0 100 4.0 100 4.0 EFFICIENCY 95 3.5 95 3.5 95 3.6 90 3.2 90 EFFICIENCY 3.0 90 3.0 POWER LOSS (W) EFFICIENCY POWER LOSS (W) 85 2.8 POWER LOSS (W) 85 2.5 85 2.5 fSW = 500kHz 80 L = XEL6060, 2.7µH 2.4 80 2.0 80 2.0 75 2.0 75 1.5 70 1.6 EFFICIENCY (%) 75 1.5 EFFICIENCY (%) EFFICIENCY (%) POWER LOSS POWER LOSS 65 1.2 70 L = XEL6060 1.0 70 L = XEL6060 1.0 VIN = 12V 500kHz, L = 2.7µH 500kHz, L = 2.7µH 60 V 0.8 IN = 24V 65 1MHz, L = 2.2µH 0.5 65 1MHz, L = 1.5µH 0.5 V 55 IN = 36V 0.4 2MHz, L = 1µH 2MHz, L = 0.82µH POWER LOSS VIN = 48V 60 0 60 0 50 0 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 0 1 2 3 4 5 6 7 8 LOAD CURRENT (A) LOAD CURRENT (A) LOAD CURRENT (A) 8645S G01 8645S G02 8645S G03
LT8645S Low Load Efficiency LT8646S Low Load Efficiency Efficiency at 3.3VOUT at 5VOUT at 5VOUT OUT
100 4.0 100 100 EFFICIENCY 95 3.6 90 90 90 3.2 80 80 85 2.8 POWER LOSS (W) 70 80 2.4 70 fSW = 500kHz 60 75 L = XEL6060, 2.7µH 2.0 60 50 70 1.6 EFFICIENCY (%) 50 V EFFICIENCY (%) IN = 12V V EFFICIENCY (%) IN = 12V 40 65 1.2 VIN = 24V VIN = 24V V 40 V V IN = 12V 30 IN = 36V 60 IN = 36V V 0.8 V V IN = 24V IN = 48V IN = 48V 55 V 30 IN = 36V 0.4 f 20 SW = 500kHz fSW = 500kHz POWER LOSS VIN = 48V L = WE–LHMI7050, 4.7µH L = WE–LHMI7050, 4.7µH 50 0 20 10 0 1 2 3 4 5 6 7 8 0.01 0.1 1 10 100 1000 0.1 1 10 100 1000 LOAD CURRENT (A) LOAD CURRENT (mA) LOAD CURRENT (mA) 8645S G04 8645S G05 8645S G06
LT8645S Low Load Efficiency at LT8646S Low Load Efficiency at 3.3VOUT 3.3V L OUT T8646S Low Load Efficiency at 3.3V Efficiency vs Frequency OUT
100 100 96 90 90 94 VIN = 12V 80 80 92 70 70 90 60 60 88 50 V V IN = 12V IN = 24V 50 VIN = 12V 86 EFFICIENCY (%) EFFICIENCY (%) 40 V EFFICIENCY (%) VIN = 24V IN = 24V 40 V V IN = 36V IN = 36V 84 V 30 V IN = 48V IN = 48V VOUT = 3.3V 30 f 20 f 82 I SW = 500kHz SW = 500kHz LOAD = 2A L = WE–LHMI7050, 4.7µH L = WE–LHMI7050, 4.7µH L = XEL6060, 4.7µH 20 10 80 0.01 0.1 1 10 100 1000 0.1 1 10 100 1000 0.4 0.7 1 1.3 1.6 1.9 2.2 LOAD CURRENT (mA) LOAD CURRENT (mA) SWITCHING FREQUENCY (MHz) 8645S G07 8645S G08 8645S G09 Rev. B For more information www.analog.com 5 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Applications Related Parts