ROHM Semiconductor provides a number of step down switching regulators with integrated MOSFETs. These solutions provide simple step-down power management, used in significant numbers for several applications. From the incorporation of shutdown functionality to increased efficiency, switching regulators offer numerous benefits over industry standard options such as linear regulators.

The BD9G101G is a switching regulator with integrated internal high-side 42 V Power MOSFET. It provides 0.5 A DC output with a small SOT23 package. Its operating frequency is fixed at 1.5 MHz, allowing the use of small inductors and ceramic capacitors. The components of phase compensation are built in. The BD9G101G is SOT-23-6 (SSOP6) package.

The ROHM BD9329EFJ can provide up to 3 A and the BD9328 can provide up to 2 A of output current at the required output voltage. These devices also feature a wide input voltage range which can be as high as 18 V and as low as 4.2 V. These devices have a built-in power MOSFET with low R_DS(ON) to reduce the number of external components required for the application circuit. A 0.9 V internal reference is used in the error amplifier circuit to minimize the components needed for setting the output voltage. The equation for setting the output voltage is (R1+R2/R2) x (0.9). Output voltage can be set anywhere from 0.9 V to maximum of V_CC x 0.7.