ROHM Introduces New 900kHz Single-Channel Step-Down Switching Regulator

ROHM Electronics announced the BD9870, a single-channel step-down switching regulator that is said to offer high efficiency, exceptional space savings, design simplicity and high reliability for a variety of applications, including TVs, DVD players, gaming consoles, PCs, car audio and navigation systems, industrial and office equipment, and entertainment systems.

The BD9870 integrates a switching voltage regulator, 1.5A-rated p-channel power MOSFET and compensation circuitry into a compact TO-252S-5 package. Eliminating external feedback compensation components makes complete design possible using only an external coil, diode and output capacitor. In addition, the device’s 900 kHz operation permits use of a smaller coil and ceramic output capacitor, which, when combined with the regulator’s internal features, which is said to result in a 60% board-space savings compared with current solutions on the market.

The company claims that the BD9870 IC offers the industry’s highest efficiency (88%) and output accuracy (+/-1.0%), the lowest bias current (3 mA) and zero standby current. The input voltage can range from 8 to 35 V, with output voltage adjustable down to 1.0V. A (5 ms, fixed) soft-start feature is also included. Reliability is enhanced by internal protection circuits, including thermal shutdown (TSD) and over-current protection (OCP).

The combined benefits of the BD9870’s small package size, high switching frequency, minimal external components and integrated protection circuitry are said to result in a compact, efficient and highly reliable switching power supply that is as simple to design in and use as an LDO.

The units are available now, and priced at $1.20 (OEM quantities), with delivery of 10-12 weeks ARO.