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LT3431 Datasheet(PDF) 5 Page - Linear Technology |
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LT3431 Datasheet(HTML) 5 Page - Linear Technology |
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5 / 28 page  5 LT1766/LT1766-5 1766fa Switching Frequency BOOST Pin Current VC Pin Shutdown Threshold Minimum Input Voltage with 5V Output Switch Voltage Drop TYPICAL PERFOR A CE CHARACTERISTICS JUNCTION TEMPERATURE ( °C) –50 50 100 1766 G10 0 25 75 230 220 210 200 190 180 170 –25 125 LOAD CURRENT (A) 0 1766 G11 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 7.5 7.0 6.5 6.0 5.5 5.0 MINIMUM INPUT VOLTAGE TO START MINIMUM INPUT VOLTAGE TO RUN TA = 25°C SWITCH CURRENT (A) 0 0.5 1 1.5 1766 G12 45 40 35 30 25 20 15 10 5 0 TA = 25°C JUNCTION TEMPERATURE ( °C) –50 1.5 1.7 2.1 25 75 1766 G13 1.3 1.1 –25 0 50 100 125 0.9 0.7 1.9 SWITCH CURRENT (A) 0 0.5 1 1.5 1766 G14 450 400 350 300 250 200 150 100 50 0 TJ = 125°C TJ = 25°C TJ = –40°C PI FU CTIO S GND (Pins 1, 8, 9, 16, 17): The GND pin connections act as the reference for the regulated output, so load regula- tion will suffer if the “ground” end of the load is not at the same voltage as the GND pins of the IC. This condition will occur when load current or other currents flow through metal paths between the GND pins and the load ground. Keep the paths between the GND pins and the load ground short and use a ground plane when possible. The GND pin also acts as a heat sink and should be soldered to a large copper plane to reduce thermal resistance. For the FE package, the exposed pad should be soldered to the copper ground plane underneath the device. (See Applica- tions Information—Layout Considerations.) SW (Pin 2): The switch pin is the emitter of the on-chip power NPN switch. This pin is driven up to the input pin voltage during switch on time. Inductor current drives the switch pin negative during switch off time. Negative volt- age is clamped with the external catch diode. Maximum negative switch voltage allowed is – 0.8V. NC (Pins 3, 5, 7, 13): No Connection. Switch Minimum ON Time vs Temperature JUNCTION TEMPERATURE ( °C) –50 400 500 600 25 75 1766 G15 300 200 –25 0 50 100 125 100 0 |
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