A SC case is used for packaging. As you can see, the IC chip has 4 terminations. There are 4 pins in total in this voltage regulator IC. It has 1 outputs to ensure that the performance of this regulator is prompt and sufficient. The component shown here is a typical Other Regulators component. It is important to note that this device has a FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR regulator type. In general, this IC voltage regulator is able to output 5V volts on a system basis.
TDA3664 Features
Other Regulators subtageroy
TDA3664 Applications
There are a lot of NXP Semiconductors / Freescale TDA3664 Linear Voltage Regulators applications.