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IR3535 Datasheet(PDF) 14 Page - International Rectifier |
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IR3535 Datasheet(HTML) 14 Page - International Rectifier |
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14 / 17 page ![]() March 13, 2013 | FINAL DATASHEET 14 IR3535 Synchronous Buck Converter Driver SOLDER RESIST • The solder resist should be pulled away from the metal lead lands by a minimum of 0.06mm. The solder resist miss‐alignment is a maximum of 0.05mm and it is recommended that the lead lands are all Non Solder Mask Defined (NSMD). Therefore pulling the S/R 0.06mm will always ensure NSMD pads. • The minimum solder resist width is 0.13mm. • At the inside corner of the solder resist where the lead land groups meet, it is recommended to provide a fillet so a solder resist width of ≥ 0.17mm remains. • The land pad should be Solder Mask Defined (SMD), with a minimum overlap of the solder resist onto the copper of 0.06mm to accommodate solder resist miss‐alignment. In 0.5mm pitch cases it is allowable to have the solder resist opening for the land pad to be smaller than the part pad. • Ensure that the solder resist in‐between the lead lands and the pad land is ≥ 0.15mm due to the high aspect ratio of the solder resist strip separating the lead lands from the pad land. • The four vias in the land pad should be tented or plugged from bottom board side with solder resist. Figure 12: Solder resist * Contact International Rectifier to receive an electronic PCB Library file in your preferred format |
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