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LM2640 series datasheets. Manufacturer: National Semiconductor.

LM2640MTC-ADJDual Adjustable Step-Down Switching Power Supply Controller in 28-pin TSSOP package.Datasheet*)
LM2640MTCX-ADJDual Adjustable Step-Down Switching Power Supply Controller in 28-pin TSSOP package.Datasheet*)
LM2640Dual Adjustable Step-Down Switching Power Supply ControllerDatasheet*)
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