Datasheet LT8625S (Analog Devices) - 8
| 制造商 | Analog Devices |
| 描述 | 18V/8A Step-Down Silent Switcher 3 with Ultralow Noise Reference |
| 页数 / 页 | 39 / 8 — 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. Minimum SVIN as a. PVIN Dropout Voltage
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LT8625S
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Minimum SVIN as a Minimum SVIN as a PVIN Dropout Voltage Function of VSET Function of VSET
1000 8 18 PVIN = 3.3V, SVIN = 5V PNP ERROR AMPLIFIER IS ACTIVE 900 VSET = 3.3V, VOUT TO REGULATE TO 3.3V 7 16 FOR VSET AND SVIN OUTSIDE THE RED BOX L = HPL758040F, 0.33µH (DCR = 0.61mΩ) 800 V PULSE-SKIPPING MODE SET 6 14 MINIMUM SVIN 700 (V) 12 600 5 IN TAGE (mV) NPN ERROR AMPLIFIER ACTIVE 10 500 4 (V) ONLY INSIDE RED BOX IN 8 (WHEN SV SV IN – VSET ≤ 1V) 400 3 6 300 MINIMUM SV DROPOUT VOL 2 200 4 100 1 MINIMUM SVIN 2 V 0 SET 0 0 0 1 2 3 4 5 6 7 8 0 1 2 3 4 5 6 0 1 2 3 4 5 6 LOAD CURRENT (A) VSET (V) VSET (V) 8625s G25 8625s G26 8625s G27
SVIN Dropout Voltage Minimum SVIN No-Load Supply Current
500 3.0 5.0 PVIN = 12V VOUT ≤ 2.1V 450 VOUT > 2.4V 2.9 4.5 400 2.8 4.0 350 2.7 3.5 (V) 300 IN 2.6 3.0 TAGE (mV) 250 2.5 2.5 200 2.4 2.0 150 MINIMUM SV 2.3 1.5 DROPOUT VOL INPUT CURRENT (mA) V 100 2.2 OUT = 1V 1.0 L = 0.33µH 50 2.1 PULSE-SKIPPING MODE 0.5 IN REGULATION 0 2.0 0 0 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 TEMPERATURE (°C) TEMPERATURE (°C) INPUT VOLTAGE (V) 8625s G28 8625s G29 8625s G30
Minimum On-Time Switching Frequency vs Temperature Minimum On-Time vs Load
2.100 20 20 R I T = 47k LOAD = 2A VOUT = 0.5V 2.075 19 VOUT = 0.5V 19 f f SW = 4MHz SW = 4MHz 18 FC MODE 18 2.050 FC MODE 17 17 2.025 16 16 2.000 15 15 1.975 14 14 13 13 1.950 MINIMUM ON-TIME (ns) MINIMUM ON-TIME (ns) SWITCHING FREQUENCY (MHz) 12 12 1.925 11 11 1.900 10 10 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 0 1 2 3 4 5 6 7 8 TEMPERATURE (°C) TEMPERATURE (°C) LOAD CURRENT (A) 8625s G31 8625s G32 8625s G33 Rev. B 8 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 Typical Applications Package Description Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Minimum SVIN as a Minimum SVIN as a PVIN Dropout Voltage Function of VSET Function of VSET
1000 8 18 PVIN = 3.3V, SVIN = 5V PNP ERROR AMPLIFIER IS ACTIVE 900 VSET = 3.3V, VOUT TO REGULATE TO 3.3V 7 16 FOR VSET AND SVIN OUTSIDE THE RED BOX L = HPL758040F, 0.33µH (DCR = 0.61mΩ) 800 V PULSE-SKIPPING MODE SET 6 14 MINIMUM SVIN 700 (V) 12 600 5 IN TAGE (mV) NPN ERROR AMPLIFIER ACTIVE 10 500 4 (V) ONLY INSIDE RED BOX IN 8 (WHEN SV SV IN – VSET ≤ 1V) 400 3 6 300 MINIMUM SV DROPOUT VOL 2 200 4 100 1 MINIMUM SVIN 2 V 0 SET 0 0 0 1 2 3 4 5 6 7 8 0 1 2 3 4 5 6 0 1 2 3 4 5 6 LOAD CURRENT (A) VSET (V) VSET (V) 8625s G25 8625s G26 8625s G27
SVIN Dropout Voltage Minimum SVIN No-Load Supply Current
500 3.0 5.0 PVIN = 12V VOUT ≤ 2.1V 450 VOUT > 2.4V 2.9 4.5 400 2.8 4.0 350 2.7 3.5 (V) 300 IN 2.6 3.0 TAGE (mV) 250 2.5 2.5 200 2.4 2.0 150 MINIMUM SV 2.3 1.5 DROPOUT VOL INPUT CURRENT (mA) V 100 2.2 OUT = 1V 1.0 L = 0.33µH 50 2.1 PULSE-SKIPPING MODE 0.5 IN REGULATION 0 2.0 0 0 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 TEMPERATURE (°C) TEMPERATURE (°C) INPUT VOLTAGE (V) 8625s G28 8625s G29 8625s G30
Minimum On-Time Switching Frequency vs Temperature Minimum On-Time vs Load
2.100 20 20 R I T = 47k LOAD = 2A VOUT = 0.5V 2.075 19 VOUT = 0.5V 19 f f SW = 4MHz SW = 4MHz 18 FC MODE 18 2.050 FC MODE 17 17 2.025 16 16 2.000 15 15 1.975 14 14 13 13 1.950 MINIMUM ON-TIME (ns) MINIMUM ON-TIME (ns) SWITCHING FREQUENCY (MHz) 12 12 1.925 11 11 1.900 10 10 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 0 1 2 3 4 5 6 7 8 TEMPERATURE (°C) TEMPERATURE (°C) LOAD CURRENT (A) 8625s G31 8625s G32 8625s G33 Rev. B 8 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 Typical Applications Package Description Typical Application Related Parts