Step-down switching regulators with built-in power MOSFET

April 19, 2013 // By Graham Prophet
Rohm Semiconductor has announced a series of step-down switching regulators with a built-in 45V/800-mΩ power MOSFET.

The BD9G101G series provides 0.5A DC output with excellent line and load regulation for smart power management in a small SOT23 (SSOP6) package. The operating frequency is fixed at 1.5 MHz, allowing the use of a small inductor and a ceramic capacitor in order to reduce space requirements. All phase compensation components are integrated as well.

The input voltage can vary from 6 to 42V, the internal reference voltage is set to 0.75V with an accuracy of typical ±1.5%. Suited to facilitate step-down switching designs, the new device offers low thermal resistance and multiple protection features such as internal over-current protection, under-voltage lock-out and thermal shutdown. The operating temperature is from -40°C to +105°C while the maximum junction temperature is 150°. Use them in industrial distributed power and automotive applications, battery powered equipment and medical OA instruments.