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LT6656AIS6-4.096 Datasheet(PDF) 12 Page - Linear Technology |
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LT6656AIS6-4.096 Datasheet(HTML) 12 Page - Linear Technology |
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12 / 18 page  LT6656 6656fa 0 2 4 6 MINUTES 8 0 75 150 225 300 6656 F10 10 120s 40s tP 30s TP = 260°C RAMP DOWN RAMP TO 150°C TS = 190°C T = 150°C tL 130s TL = 217°C TS(MAX) = 200°C 380s applicaTions inForMaTion PC Board Layout The mechanical stress of soldering a surface mount volt- age reference to a PC board can cause the output voltage to shift and temperature coefficient to change. To reduce the effects of stress-related shifts, position the reference near the short edge of the PC board or in a corner. In addition, slots can be cut into the board on two sides of the device. See Application Note AN82 for more information. http://www.linear.com The input and output capacitors should be mounted close to the package. The GND and VOUT traces should be as short as possible to minimize the voltage drops caused by load and ground currents. Excessive trace resistance directly impacts load regulation. Figure 10. Lead Free Reflow Profile Due to IR Reflow Figure 11. Output Voltage Shift Due to IR Reflow, Peak Temperature = 260°C CHANGE IN OUTPUT VOLTAGE (ppm) 0 60 20 7 6 4 2 1 5 3 0 6656 F11 220 180 140 100 3 CYCLES 1 CYCLE 2.5V OPTION VIN = 3V CL = 1µF IL = 0 IR reflow. Common lead free IR reflow profiles reach over 250°C, considerably more than lead solder profiles. The higherreflowtemperatureoftheleadfreepartsexacerbates the issue of thermal expansion and contraction causing the output shift to generally be greater than with a leaded reflow process. The lead free IR reflow profile used to experimentally measure the output voltage shift in the LT6656-2.5 is shown in Figure 10. Similar results can be expected using a convection reflow oven. Figure 11 shows the change in output voltage that was measured for parts that were run through the reflow process for 1 cycle and also 3 cycles. The results indicate that the standard deviation of the output voltage increases with a positive mean shift of 120ppm. While there can be up to 220ppm of output voltage shift, additional drift of the LT6656 after IR reflow does not vary significantly. Figure 9. –40°C to 85°C Hysteresis HYSTERESIS (ppm) –160 –120 –40 –80 20 18 14 12 8 4 16 10 6 2 0 6656 F09 160 120 40 80 0 –40°C TO 25°C 85°C TO 25°C 2.5V OPTION VIN = 3V CL = 1µF IL = 0 Figure 8. 0°C to 70°C Hysteresis HYSTERESIS (ppm) –60 –40 –20 30 25 15 5 20 10 0 6656 F08 60 40 20 0 2.5V OPTION VIN = 3V CL = 1µF IL = 0 0°C TO 25°C 70°C TO 25°C |
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