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LT6656AIS6-2.5TRPBF Datasheet(PDF) 10 Page - Linear Technology |
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LT6656AIS6-2.5TRPBF Datasheet(HTML) 10 Page - Linear Technology |
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10 / 12 page  LT6656 0 6656f 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 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. 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 VIN = 3V CL = 1µF IL = 0 3 CYCLES 1 CYCLE Typical applicaTions Regulator Reference The robust input and output of the LT6656 along with its high output current make it an excellent precision low power regulator as well as a reference. The LT6656 would be a good match with a small, low power microcontroller. Using the LT6656 as a regulator reduces power consump- tion, decreases solution size and increases the accuracy of the microcontroller’s on board ADC. Microcontroller Reference and Regulator OUT IN C13 0.1µF C12 10µF LT6656 3V TO 18V 6656 TA02 PB0/AIN0/AREF/MOSI MCU 5 PB1/INT0/AIN1/MISO/OC1A 6 PB2/ADC1/SCK/T0/INT0 7 PB3/ADC2 2 PB4/ADC3 3 PB5/RESET/ADC0 1 VCC/VREF GND |
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