Datasheet LT8650S (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | Dual Channel 4A, 42V, Synchronous Step-Down Silent Switcher 2 with 6.2µA Quiescent Current |
| Pages / Page | 32 / 5 — TYPICAL PERFORMANCE CHARACTERISTICS. Efficiency at Different fSW. … |
| Revision | B |
| File Format / Size | PDF / 3.3 Mb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Efficiency at Different fSW. Efficiency vs fSW. Reference Voltage
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Text Version of Document
LT8650S
TYPICAL PERFORMANCE CHARACTERISTICS Efficiency at Different fSW Efficiency vs fSW Reference Voltage
100 100 0.810 0.808 95 95 0.806 0.804 90 90 TAGE (V) 0.802 85 85 0.800 0.798 EFFICIENCY (%) 80 EFFICIENCY (%) 80 0.796 12VIN REFERENCE VOL 0.5MHz 2.2µH 3.3V 0.794 75 12VIN 1MHz 1.5µH OUT 75 3.3VOUT 2MHz 1.5µH 1.8A LOAD 0.792 L = IHLP2525EZ–01 3MHz 1.5µH L = IHLP2525EZ–01, 1.5µH 70 70 0.790 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 0.5 1 1.5 2 2.5 3 –55 –25 5 35 65 95 125 155 LOAD CURRENT (A) SWITCHING FREQUENCY (MHz) TEMPERATURE (°C) 8650s G05 8650s G06 8650S G07
No Load Supply Current with Load Regulation Line Regulation Internal Compensation
0.40 0.4 20 VIN1 = VIN2 = 12V VIN1 = VIN2 VIN1 = VIN2 0.30 VOUT1 = 5V, VOUT2 = 3.3V 0.3 IOUT = 0A 18 VOUT1 = 5V, VOUT2 = 3.3V FCM, fSW = 2MHz 16 IN REGULATION 0.20 0.2 SYNC = 0V, VBIAS = VOUT2 14 (%) 0.10 (%) 0.1 OUT OUT 12 0.00 0.0 10 –0.10 –0.1 8 CHANGE IN V CHANGE IN V 6 INPUT CURRENT (µA) –0.20 –0.2 4 –0.30 CH1 –0.3 2 BOTH CHANNELS ENABLED CH2 ONLY CHANNEL 2 ENABLED –0.40 –0.4 0 0 1 2 3 4 5 6 0 5 10 15 20 25 30 35 40 45 5 10 15 20 25 30 35 40 OUTPUT CURRENT (A) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 8650S G08 8650S G09 8650S G10
No Load Supply Current with External Compensation No Load Supply Current Top FET Current Limit
160 160 16 VIN1 = VIN2 VIN1 = VIN2 = 12V 140 VOUT1 = 5V, VOUT2 = 3.3V 140 VOUT1 = 5V, VOUT2 = 3.3V IN REGULATION 14 VBIAS = VOUT1 120 SYNC = 0V 120 SYNC = 0V 12 100 100 10 80 80 8 60 60 INPUT CURRENT (µA) INPUT CURRENT (µA) CURRENT LIMIT (A) 6 40 40 20 20 4 0 0 2 5 10 15 20 25 30 35 40 –55 –25 5 35 65 95 125 155 0 0.2 0.4 0.6 0.8 1 INPUT VOLTAGE (V) TEMPERATURE (°C) DUTY CYCLE 8650S G11 8650S G12 8650S G13 BOTH CHANNELS ENABLED, BIAS = FLOAT BOTH CHANNELS IN REGULATION ONLY CHANNEL 2 ENABLED, BIAS = FLOAT INTERNAL COMP BOTH CHANNELS ENABLED, BIAS = VOUT2 EXTERNAL COMP ONLY CHANNEL 2 ENABLED, BIAS = VOUT2 Rev. B For more information www.analog.com 5 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 Typical Applications Package Description Revision History Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS Efficiency at Different fSW Efficiency vs fSW Reference Voltage
100 100 0.810 0.808 95 95 0.806 0.804 90 90 TAGE (V) 0.802 85 85 0.800 0.798 EFFICIENCY (%) 80 EFFICIENCY (%) 80 0.796 12VIN REFERENCE VOL 0.5MHz 2.2µH 3.3V 0.794 75 12VIN 1MHz 1.5µH OUT 75 3.3VOUT 2MHz 1.5µH 1.8A LOAD 0.792 L = IHLP2525EZ–01 3MHz 1.5µH L = IHLP2525EZ–01, 1.5µH 70 70 0.790 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 0.5 1 1.5 2 2.5 3 –55 –25 5 35 65 95 125 155 LOAD CURRENT (A) SWITCHING FREQUENCY (MHz) TEMPERATURE (°C) 8650s G05 8650s G06 8650S G07
No Load Supply Current with Load Regulation Line Regulation Internal Compensation
0.40 0.4 20 VIN1 = VIN2 = 12V VIN1 = VIN2 VIN1 = VIN2 0.30 VOUT1 = 5V, VOUT2 = 3.3V 0.3 IOUT = 0A 18 VOUT1 = 5V, VOUT2 = 3.3V FCM, fSW = 2MHz 16 IN REGULATION 0.20 0.2 SYNC = 0V, VBIAS = VOUT2 14 (%) 0.10 (%) 0.1 OUT OUT 12 0.00 0.0 10 –0.10 –0.1 8 CHANGE IN V CHANGE IN V 6 INPUT CURRENT (µA) –0.20 –0.2 4 –0.30 CH1 –0.3 2 BOTH CHANNELS ENABLED CH2 ONLY CHANNEL 2 ENABLED –0.40 –0.4 0 0 1 2 3 4 5 6 0 5 10 15 20 25 30 35 40 45 5 10 15 20 25 30 35 40 OUTPUT CURRENT (A) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 8650S G08 8650S G09 8650S G10
No Load Supply Current with External Compensation No Load Supply Current Top FET Current Limit
160 160 16 VIN1 = VIN2 VIN1 = VIN2 = 12V 140 VOUT1 = 5V, VOUT2 = 3.3V 140 VOUT1 = 5V, VOUT2 = 3.3V IN REGULATION 14 VBIAS = VOUT1 120 SYNC = 0V 120 SYNC = 0V 12 100 100 10 80 80 8 60 60 INPUT CURRENT (µA) INPUT CURRENT (µA) CURRENT LIMIT (A) 6 40 40 20 20 4 0 0 2 5 10 15 20 25 30 35 40 –55 –25 5 35 65 95 125 155 0 0.2 0.4 0.6 0.8 1 INPUT VOLTAGE (V) TEMPERATURE (°C) DUTY CYCLE 8650S G11 8650S G12 8650S G13 BOTH CHANNELS ENABLED, BIAS = FLOAT BOTH CHANNELS IN REGULATION ONLY CHANNEL 2 ENABLED, BIAS = FLOAT INTERNAL COMP BOTH CHANNELS ENABLED, BIAS = VOUT2 EXTERNAL COMP ONLY CHANNEL 2 ENABLED, BIAS = VOUT2 Rev. B For more information www.analog.com 5 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 Typical Applications Package Description Revision History Typical Application Related Parts
