UM1650 UM1750 350mA, Micropower, Very Low Dropout.
Union Semiconductor
UM1650 - Very Low Dropout Linear Regulator
UM1650 UM1750 350mA, Micropower, Very Low Dropout Linear Regulator UM1650S-xx SOT23-3 UM1750S-xx SOT23-5 UM1750Y-xx SOT89-5 UM1750DA-xx DFN6 2.0×2.0 .