National Semiconductor LM3668SDX-4550/NOPB Current - Output: 1A Frequency - Switching: 2.2MHz Internal Switch(s): Yes Mounting Type: Surface Mount Number Of Outputs: 1 Operating Temperature: -40?°C ~ 85?°C Package / Case: 12-LLP Power - Output: - Series: PowerWise?® Synchronous Rectifier: Yes Type: Step-Down (Buck), Step-Up (Boost) Voltage - Input: 2.5 ~ 5.5 V Voltage - Output: 4.5 ~ 5 V Other Names: LM3668SDX-4550