Datasheet LT3995 (Analog Devices) - 6
| 制造商 | Analog Devices |
| 描述 | 60V, 3A, 2MHz Step-Down Switching Regulator with 2.7μA Quiescent Current |
| 页数 / 页 | 24 / 6 — TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. RT … |
| 文件格式/大小 | PDF / 356 Kb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. RT Programmed Switching. Minimum Off-Time
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LT3995
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. RT Programmed Switching Minimum Off-Time Switching Frequency Frequency
250 780 350 V R SYNC = 0V T = 78.7k fSW = 2MHz 225 720 300 LOAD = 2A 250 200 660 LOAD = 1A 200 175 600 150 RESISTOR (kΩ) 150 540 R T 100 MINIMUM OFF-TIME (ns) SWITCHING FREQUENCY (kHz) 125 480 50 100 420 0 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 TEMPERATURE (°C) TEMPERATURE (°C) SWITCHING FREQUENCY (MHz) 3995 G18 3995 G19 3995 G20
Internal Undervoltage Lockout Frequency Foldback (UVLO) EN Threshold
700 6 1.09 RT = 78.7k EN RISING 600 1.08 5 1.07 500 4 1.06 400 3 1.05 300 1.04 2 200 INPUT VOLTAGE (V) EN THRESHOLD (V) 1.03 SWITCHING FREQUENCY (kHz) 100 1 EN FALLING 1.02 0 0 1.01 0 0.2 0.4 0.6 0.8 1 1.2 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 FB PIN VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 3995 G21 3995 G22 3995 G23
Minimum Input Voltage, Minimum Input Voltage, PG Thresholds VOUT = 5V VOUT = 3.3V
1.12 6.5 5.0 VOUT = 5V VOUT = 3.3V 1.11 fSW = 500kHz FRONT PAGE APPLICATION 6.0 4.5 1.10 TO RUN/TO START TO RUN/TO START 1.09 FB RISING 5.5 4.0 1.08 1.07 FB FALLING 5.0 3.5 PG THRESHOLD (V) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 1.06 4.5 3.0 1.05 1.04 4.0 2.5 –55 –25 5 35 65 95 125 155 0 0.5 1.0 1.5 2.0 2.5 3.0 0 0.5 1.0 1.5 2.0 2.5 3.0 TEMPERATURE (°C) LOAD CURRENT (A) LOAD CURRENT (A) 3995 G24 3995 G25 3995 G26 3995f 6 For more information www.linear.com/LT3995 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Order Information 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. RT Programmed Switching Minimum Off-Time Switching Frequency Frequency
250 780 350 V R SYNC = 0V T = 78.7k fSW = 2MHz 225 720 300 LOAD = 2A 250 200 660 LOAD = 1A 200 175 600 150 RESISTOR (kΩ) 150 540 R T 100 MINIMUM OFF-TIME (ns) SWITCHING FREQUENCY (kHz) 125 480 50 100 420 0 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 TEMPERATURE (°C) TEMPERATURE (°C) SWITCHING FREQUENCY (MHz) 3995 G18 3995 G19 3995 G20
Internal Undervoltage Lockout Frequency Foldback (UVLO) EN Threshold
700 6 1.09 RT = 78.7k EN RISING 600 1.08 5 1.07 500 4 1.06 400 3 1.05 300 1.04 2 200 INPUT VOLTAGE (V) EN THRESHOLD (V) 1.03 SWITCHING FREQUENCY (kHz) 100 1 EN FALLING 1.02 0 0 1.01 0 0.2 0.4 0.6 0.8 1 1.2 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 FB PIN VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 3995 G21 3995 G22 3995 G23
Minimum Input Voltage, Minimum Input Voltage, PG Thresholds VOUT = 5V VOUT = 3.3V
1.12 6.5 5.0 VOUT = 5V VOUT = 3.3V 1.11 fSW = 500kHz FRONT PAGE APPLICATION 6.0 4.5 1.10 TO RUN/TO START TO RUN/TO START 1.09 FB RISING 5.5 4.0 1.08 1.07 FB FALLING 5.0 3.5 PG THRESHOLD (V) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 1.06 4.5 3.0 1.05 1.04 4.0 2.5 –55 –25 5 35 65 95 125 155 0 0.5 1.0 1.5 2.0 2.5 3.0 0 0.5 1.0 1.5 2.0 2.5 3.0 TEMPERATURE (°C) LOAD CURRENT (A) LOAD CURRENT (A) 3995 G24 3995 G25 3995 G26 3995f 6 For more information www.linear.com/LT3995 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts