Download "Chapter IV : Local Power Supply ICs" (PDF:770KB)
There are two types of local power supply ICs: (1) linear type and (2) switching type. The circuit designer can maximize the performance of the equipment by appropriately selecting these power ICs and placing them in the appropriate place.
Linear type includes a series regulator (typically LDO and 3-terminal regulator) and a shunt regulator. A low-noise, high-precision, local power supply can be easily and inexpensively produced with few external parts. However, losses are high (inefficient) and only step-down type can be used. In particular, shunt regulators are inefficient and tend not to be used nowadays.
It is often called a DC/DC converter. Depending on the circuit configuration, either boost type or buck type can be used. Although the loss is low (high efficiency), external parts such as coil are necessary, and the circuit size becomes large and expensive.
The input DC voltage is switched (~ 1 MHz) to create a rectangular wave, and this rectangular wave is smoothed and converted to the desired DC voltage.
Although the variety of ICs offered by our company is limited, we offer a wide variety of MOSFETs for use in DC/DC converter applications.