Datasheet LT3480 (Analog Devices) - 5
| 制造商 | Analog Devices |
| 描述 | 36V, 2A, 2.4MHz Step-Down Switching Regulator with 70µA Quiescent Current |
| 页数 / 页 | 24 / 5 — TYPICAL PERFORMANCE CHARACTERISTICS. Maximum Load Current. Switch Current … |
| 文件格式/大小 | PDF / 388 Kb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS. Maximum Load Current. Switch Current Limit. Switch Voltage Drop. Boost Pin Current
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LT3480
TYPICAL PERFORMANCE CHARACTERISTICS Maximum Load Current Switch Current Limit Switch Current Limit
3.5 4.0 4.5 TYPICAL 4.0 DUTY CYCLE = 10 % 3.0 3.5 3.5 3.0 3.0 2.5 2.5 DUTY CYCLE = 90 % MINIMUM 2.5 2.0 2.0 LOAD CURRENT (A) 2.0 1.5 VOUT = 5V 1.5 T SWITCH CURRENT LIMIT(A) SWITCH CURRENT LIMIT (A) 1.0 A = 25 °C L = 4.7µH 1.5 0.5 f = 800kHz 1.0 1.0 0 5 10 15 20 25 30 0 20 40 60 80 100 –50 –25 0 25 50 75 100 125 150 INPUT VOLTAGE (V) DUTY CYCLE (%) TEMPERATURE (°C) 3480 G07 3480 G08 3480 G09
Switch Voltage Drop Boost Pin Current Feedback Voltage
700 80 840 600 70 60 820 500 50 400 TAGE (mV) 40 800 300 TAGE DROP (mV) 30 VOL 200 BOOST PIN CURRENT (mA) 20 FEEDBACK VOL 780 100 10 0 0 760 0 500 1000 1500 2000 2500 0 500 1000 1500 2000 2500 –50 –25 0 25 50 75 100 125 150 SWITCH CURRENT (mA) SWITCH CURRENT (mA) TEMPERATURE (°C) 3480 G10 3480 G11 4380 G12
Switching Frequency Frequency Foldback Minimum Switch On-Time
1.20 1200 140 1.15 1000 120 1.10 800 100 1.05 80 1.00 600 60 0.95 FREQUENCY (MHz) 400 40 0.90 SWITCHING FREQUENCY (kHz) 200 MINIMUM SWITCH ON TIME (ns) 0.85 20 0.80 0 0 –50 –25 0 25 50 75 100 125 150 0 100 200 300 400 500 600 700 800 900 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) FB PIN VOLTAGE (mV) TEMPERATURE (˚C) 4380 G13 3480 G14 3480 G15 3480fe For more information www.linear.com/LT3480 5 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings 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 Maximum Load Current Switch Current Limit Switch Current Limit
3.5 4.0 4.5 TYPICAL 4.0 DUTY CYCLE = 10 % 3.0 3.5 3.5 3.0 3.0 2.5 2.5 DUTY CYCLE = 90 % MINIMUM 2.5 2.0 2.0 LOAD CURRENT (A) 2.0 1.5 VOUT = 5V 1.5 T SWITCH CURRENT LIMIT(A) SWITCH CURRENT LIMIT (A) 1.0 A = 25 °C L = 4.7µH 1.5 0.5 f = 800kHz 1.0 1.0 0 5 10 15 20 25 30 0 20 40 60 80 100 –50 –25 0 25 50 75 100 125 150 INPUT VOLTAGE (V) DUTY CYCLE (%) TEMPERATURE (°C) 3480 G07 3480 G08 3480 G09
Switch Voltage Drop Boost Pin Current Feedback Voltage
700 80 840 600 70 60 820 500 50 400 TAGE (mV) 40 800 300 TAGE DROP (mV) 30 VOL 200 BOOST PIN CURRENT (mA) 20 FEEDBACK VOL 780 100 10 0 0 760 0 500 1000 1500 2000 2500 0 500 1000 1500 2000 2500 –50 –25 0 25 50 75 100 125 150 SWITCH CURRENT (mA) SWITCH CURRENT (mA) TEMPERATURE (°C) 3480 G10 3480 G11 4380 G12
Switching Frequency Frequency Foldback Minimum Switch On-Time
1.20 1200 140 1.15 1000 120 1.10 800 100 1.05 80 1.00 600 60 0.95 FREQUENCY (MHz) 400 40 0.90 SWITCHING FREQUENCY (kHz) 200 MINIMUM SWITCH ON TIME (ns) 0.85 20 0.80 0 0 –50 –25 0 25 50 75 100 125 150 0 100 200 300 400 500 600 700 800 900 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) FB PIN VOLTAGE (mV) TEMPERATURE (˚C) 4380 G13 3480 G14 3480 G15 3480fe For more information www.linear.com/LT3480 5 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts