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LTC6252 Datasheet(PDF) 27 Page - Linear Technology |
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LTC6252 Datasheet(HTML) 27 Page - Linear Technology |
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27 / 40 page  LTC2345-18 27 234518f For more information www.linear.com/LTC2345-18 the REFIN pin, which serves as the input to the on-chip reference buffer, as shown in Figure 11a. When employing the internal bandgap reference, the REFIN pin should be bypassed to GND (Pin 20) close to the pin with a 0.1μF ceramic capacitor to filter wideband noise. The reference buffer amplifies VREFIN to create the converter master reference voltage VREFBUF = 2 • VREFIN on the REFBUF pin, nominally 4.096V when using the internal bandgap refer- ence. Bypass REFBUF to GND (Pin 20) close to the pin with at least a 47μF ceramic capacitor (X7R, 10V, 1210 size or X5R, 10V, 0805 size) to compensate the reference buffer, absorbtransientconversioncurrents,andminimizenoise. External Reference with Internal Buffer If more accuracy and/or lower drift is desired, REFIN can be easily overdriven by an external reference since 20kΩ of resistance separates the internal bandgap reference output from the REFIN pin, as shown in Figure 11b. The valid range of external reference voltage overdrive on the REFIN pin is 1.25V to 2.2V, resulting in converter mas- ter reference voltages VREFBUF between 2.5V and 4.4V, respectively. Linear Technology offers a portfolio of high performance references designed to meet the needs of manyapplications.Withitssmallsize,lowpower,andhigh accuracy,theLTC6655-2.048iswellsuitedforusewiththe LTC2345-18 when overdriving the internal reference. The LTC6655-2.048offers0.025%(maximum)initialaccuracy and 2ppm/°C (maximum) temperature coefficient for high precision applications. The LTC6655-2.048 is fully speci- fied over the H-grade temperature range, complementing the extended temperature range of the LTC2345-18 up to 125°C.BypassingtheLTC6655-2.048witha2.7µFto100µF ceramic capacitor close to the REFIN pin is recommended. External Reference with Disabled Internal Buffer The internal reference buffer supports VREFBUF = 4.4V maximum. By grounding REFIN, the internal buffer may be disabled allowing REFBUF to be overdriven with an external reference voltage between 2.5V and 5V, as shown applicaTions inForMaTion 234518 F11a 47µF 6.5k 20k LTC2345-18 REFERENCE BUFFER REFBUF REFIN GND BANDGAP REFERENCE 6.5k 0.1µF 234518 F11b 47µF 6.5k 20k LTC2345-18 REFERENCE BUFFER REFBUF REFIN GND BANDGAP REFERENCE 6.5k 2.7µF LTC6655-2.048 Figure 11a. Internal Reference with Internal Buffer Configuration Figure 11b. External Reference with Internal Buffer Configuration |
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