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LT1377 Datasheet(PDF) 5 Page - Linear Technology |
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LT1377 Datasheet(HTML) 5 Page - Linear Technology |
5 / 24 page 5 LT1506 TYPICAL PERFORMANCE CHARACTERISTICS Frequency Foldback FEEDBACK PIN VOLTAGE (V) 0 500 400 300 200 100 0 2.0 1506 G10 0.5 1.0 1.5 2.5 SWITCHING FREQUENCY FEEDBACK PIN CURRENT Inductor Core Loss for 3.3V Output INDUCTANCE ( µH) 02 1.0 0.1 0.01 0.001 46 8 10 1506 G01 TYPE 52 Metglas ® Kool M µ® PERMALLOY µ = 125 Switching Frequency TEMPERATURE ( °C) –50 550 540 530 520 510 500 490 480 470 460 450 100 1506 G11 –25 0 25 50 75 125 BOOST Pin Current SWITCH CURRENT (A) 0 0 10 20 40 30 60 50 12 3 45 1506 G14 80 70 100 90 DUTY CYCLE = 100% Maximum Load Current at VOUT = 3.3V INPUT VOLTAGE (V) 4 4.0 4.2 4.4 12 1506 G13 3.8 3.6 610 814 3.4 3.2 3.0 L= 10 µH L= 5 µH L= 3 µH L= 1.8 µH Maximum Load Current at VOUT = 5V INPUT VOLTAGE (V) 5 2.6 2.8 3.2 3.4 3.6 9 13 15 4.4 1506 G17 3.0 711 3.8 4.0 4.2 L= 10 µH L= 5 µH L= 3 µH L= 1.8 µH Switch Voltage Drop SWITCH CURRENT (A) 0 250 200 400 125 °C 25 °C 350 300 45 1506 G16 150 100 50 0 1 2 3 500 450 –40 °C VC Pin Shutdown Threshold JUNCTION TEMPERATURE ( °C) –50 1.4 1.2 1.0 0.8 0.6 0.4 100 1506 G15 –25 0 25 50 75 125 SHUTDOWN OUTPUT VOLTAGE (%) 0 5 6 7 80 1506 G18 4 3 20 40 60 100 2 1 0 FOLDBACK CHARACTERISTICS CURRENT SOURCE LOAD RESISTOR LOAD MOS LOAD POSSIBLE UNDESIRED STABLE POINT FOR CURRENT SOURCE LOAD* Current Limit Foldback Kool M µ is a registered trademark of Magnetics, Inc. Metglas is a registered trademark of AlliedSignal Inc. *See “More Than Just Voltage Feedback” in the Applications Information section. |
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