Datasheet LT8625S (Analog Devices) - 7
| 制造商 | Analog Devices |
| 描述 | 18V/8A Step-Down Silent Switcher 3 with Ultralow Noise Reference |
| 页数 / 页 | 39 / 7 — TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. … |
| 文件格式/大小 | PDF / 4.9 Mb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Efficiency vs VIN. SET Pin Current. Load Regulation
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LT8625S
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Efficiency vs VIN SET Pin Current Load Regulation
100 101.0 0.50 SVIN = 12V VOUT = 1.2V 95 100.8 VOUT = 1V 0.40 100.6 0.30 90 100.4 0.20 85 (%) 100.2 0.10 OUT 80 100.0 0.00 75 99.8 –0.10 EFFICIENCY (%) PVIN = SVIN 99.6 CHANGE IN V –0.20 70 SET PIN CURRENT (µA) VOUT = 1V f 99.4 –0.30 SW = 1MHz 65 ILOAD = 4A 99.2 PULSE-SKIPPING MODE –0.40 L = XGL6030, 1µH (DCR = 4.2mΩ) FC MODE 60 99.0 –0.50 3 6 9 12 15 18 –50 –25 0 25 50 75 100 125 0 1 2 3 4 5 6 7 8 INPUT VOLTAGE (V) TEMPERATURE (°C) LOAD CURRENT (A) 8625s G17 8625s G18 8625s G19
Line Regulation EN/UVLO Pin Thresholds Top MOSFET Current Limit
0.10 1.35 20 0.04 1.34 19 –0.02 EN/UVLO RISING 1.33 18 –0.08 1.32 (%) –0.14 17 OUT 1.31 –0.20 1.30 16 10% DC –0.26 1.29 15 CHANGE IN V –0.32 1.28 CURRENT LIMIT (A) V 14 OUT = 1.2 EN/UVLO THRESHOLD (V) –0.38 EN/UVLO FALLING 1.27 ILOAD = 1A –0.44 f 13 SW = 2MHz 1.26 FC MODE –0.50 1.25 12 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 INPUT VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 8625s G20 8625s G21 8625s G22
Top MOSFET Current Limit vs Duty Cycle Switch RDS(ON) vs Temperature
18 60 17 50 16 TOP SWITCH 40 15 (mΩ) 14 30 13 R DS(ON) CURRENT LIMIT (A) 20 12 BOTTOM SWITCH 10 11 10 0 10 20 30 40 50 60 70 80 90 –50 –25 0 25 50 75 100 125 DUTY CYCLE (%) TEMPERATURE (°C) 8625s G23 8625s G24 Rev. B For more information www.analog.com 7 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 Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Efficiency vs VIN SET Pin Current Load Regulation
100 101.0 0.50 SVIN = 12V VOUT = 1.2V 95 100.8 VOUT = 1V 0.40 100.6 0.30 90 100.4 0.20 85 (%) 100.2 0.10 OUT 80 100.0 0.00 75 99.8 –0.10 EFFICIENCY (%) PVIN = SVIN 99.6 CHANGE IN V –0.20 70 SET PIN CURRENT (µA) VOUT = 1V f 99.4 –0.30 SW = 1MHz 65 ILOAD = 4A 99.2 PULSE-SKIPPING MODE –0.40 L = XGL6030, 1µH (DCR = 4.2mΩ) FC MODE 60 99.0 –0.50 3 6 9 12 15 18 –50 –25 0 25 50 75 100 125 0 1 2 3 4 5 6 7 8 INPUT VOLTAGE (V) TEMPERATURE (°C) LOAD CURRENT (A) 8625s G17 8625s G18 8625s G19
Line Regulation EN/UVLO Pin Thresholds Top MOSFET Current Limit
0.10 1.35 20 0.04 1.34 19 –0.02 EN/UVLO RISING 1.33 18 –0.08 1.32 (%) –0.14 17 OUT 1.31 –0.20 1.30 16 10% DC –0.26 1.29 15 CHANGE IN V –0.32 1.28 CURRENT LIMIT (A) V 14 OUT = 1.2 EN/UVLO THRESHOLD (V) –0.38 EN/UVLO FALLING 1.27 ILOAD = 1A –0.44 f 13 SW = 2MHz 1.26 FC MODE –0.50 1.25 12 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 INPUT VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 8625s G20 8625s G21 8625s G22
Top MOSFET Current Limit vs Duty Cycle Switch RDS(ON) vs Temperature
18 60 17 50 16 TOP SWITCH 40 15 (mΩ) 14 30 13 R DS(ON) CURRENT LIMIT (A) 20 12 BOTTOM SWITCH 10 11 10 0 10 20 30 40 50 60 70 80 90 –50 –25 0 25 50 75 100 125 DUTY CYCLE (%) TEMPERATURE (°C) 8625s G23 8625s G24 Rev. B For more information www.analog.com 7 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 Typical Application Related Parts