Datasheet LT3686 (Analog Devices) - 5
| 制造商 | Analog Devices |
| 描述 | 37V/1.2A Step-Down Regulator in 3mm × 3mm DFN |
| 页数 / 页 | 28 / 5 — typicAl perForMAnce chArActeristics TA = 25°C unless otherwise noted. … |
| 文件格式/大小 | PDF / 527 Kb |
| 文件语言 | 英语 |
typicAl perForMAnce chArActeristics TA = 25°C unless otherwise noted. Switching Frequency vs. Soft-Start/Track vs Frequency
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LT3686
typicAl perForMAnce chArActeristics TA = 25°C unless otherwise noted. Switching Frequency vs Soft-Start/Track vs Frequency Switching Frequency vs RT Temperature (1MHz)
300 2.20 1200 RT = 15.4k 250 2.15 1000 200 2.10 800 (kΩ) 150 2.05 600 R T 100 FREQUENCY (MHz) 2.00 FREQUENCY (kHz) 400 50 1.95 200 0 1.90 0 0 0.5 1 1.5 2 2.5 –50 0 50 100 150 0 500 1000 1500 2000 2500 FREQUENCY (MHz) TEMPERATURE (°C) SS (mV) 3686 G09 3686 G10 3686 G11
Switch Current Limit vs Soft-Start/Track vs VFB EN/UVLO Pin Current Temperature
900 45 3.0 800 40 700 35 2.5 600 30 500 25 2.0 FB (mV) 400 20 EN/UVLO (µA) 300 15 CURRENT LIMIT (A) 1.5 200 10 100 5 0 0 1.0 0 200 400 600 800 1000 1200 0 10 20 30 40 50 –50 0 50 100 150 SS (mV) EN/UVLO (V) TEMPERATURE (°C) 3686 G12 3686 G13 3686 G14
3.3V 5V Current Limit vs Duty Cycle OUT Maximum VIN for Full OUT Maximum VIN for Full Frequency (2MHz) Frequency (2MHz)
3.0 25 35 MODE > 0.8 2.5 MODE > 0.8 30 20 SWITCH PEAK 25 2.0 MODE < 0.4 MODE < 0.4 15 20 1.5 DA VALLEY (V) (V) V IN V IN 10 15 CURRENT LIMIT (A) 1.0 10 5 0.5 VOUT = 3.3V VOUT = 5V L = 6.8µH 5 L = 10µH f = 2MHz f = 2MHz 0 0 0 0 25 50 75 100 0 500 1000 1500 0 500 1000 DUTY CYCLE (%) LOAD CURRENT (mA) LOAD CURRENT (mA) 3686 G15 3686 G16 3686 G17 3686fc 5 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Related Parts
typicAl perForMAnce chArActeristics TA = 25°C unless otherwise noted. Switching Frequency vs Soft-Start/Track vs Frequency Switching Frequency vs RT Temperature (1MHz)
300 2.20 1200 RT = 15.4k 250 2.15 1000 200 2.10 800 (kΩ) 150 2.05 600 R T 100 FREQUENCY (MHz) 2.00 FREQUENCY (kHz) 400 50 1.95 200 0 1.90 0 0 0.5 1 1.5 2 2.5 –50 0 50 100 150 0 500 1000 1500 2000 2500 FREQUENCY (MHz) TEMPERATURE (°C) SS (mV) 3686 G09 3686 G10 3686 G11
Switch Current Limit vs Soft-Start/Track vs VFB EN/UVLO Pin Current Temperature
900 45 3.0 800 40 700 35 2.5 600 30 500 25 2.0 FB (mV) 400 20 EN/UVLO (µA) 300 15 CURRENT LIMIT (A) 1.5 200 10 100 5 0 0 1.0 0 200 400 600 800 1000 1200 0 10 20 30 40 50 –50 0 50 100 150 SS (mV) EN/UVLO (V) TEMPERATURE (°C) 3686 G12 3686 G13 3686 G14
3.3V 5V Current Limit vs Duty Cycle OUT Maximum VIN for Full OUT Maximum VIN for Full Frequency (2MHz) Frequency (2MHz)
3.0 25 35 MODE > 0.8 2.5 MODE > 0.8 30 20 SWITCH PEAK 25 2.0 MODE < 0.4 MODE < 0.4 15 20 1.5 DA VALLEY (V) (V) V IN V IN 10 15 CURRENT LIMIT (A) 1.0 10 5 0.5 VOUT = 3.3V VOUT = 5V L = 6.8µH 5 L = 10µH f = 2MHz f = 2MHz 0 0 0 0 25 50 75 100 0 500 1000 1500 0 500 1000 DUTY CYCLE (%) LOAD CURRENT (mA) LOAD CURRENT (mA) 3686 G15 3686 G16 3686 G17 3686fc 5 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Related Parts