News at ROHM Semiconductor

ROHM Electronics’ New 900 kHz Single-Channel Step-Down Switching Regulator Delivers Space Savings and High Efficiency

02.22.08

The BD9870’s integrated protection and compensation circuitry, smaller external components and

ceramic input/output capacitor compatibility result in space savings of up to 60%

SAN DIEGO, Calif. — February 29, 2008 — ROHM Electronics announces the BD9870, a single-channel step-down switching regulator that offers 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, 1.5 A-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 industry-leading 900 kHz operation permits use of a smaller coil and ceramic output capacitor, which, when combined with the regulator’s internal features, results in a 60% board-space savings compared with current solutions on the market.

Compared with competitive, compensation-integrated switchers, 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 V to 35 V, with output voltage adjustable down to 1.0 V. A 5 soft-start feature (ms, fixed) 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 results in a compact, efficient, and highly reliable switching power supply that is as simple to design in and use as an LDO.

About ROHM:

ROHM is the industry leader in system LSI, discrete components and module products, utilizing the latest in semiconductor technology. ROHM’s proprietary production system, which includes some of the most advanced automation technology, is a major factor in keeping it at the forefront of the electronic component manufacturing industry. In addition to its development of electronic components, ROHM has also developed its own production system so that it can focus on specific aspects of customized product development. ROHM employs highly skilled engineers with expertise in all aspects of design, development and production. This allows ROHM the flexibility to take on a wide range of applications and projects and the capability to serve valuable clients in the automotive, telecommunication and computer sectors as well as consumer OEMs.