ROHM
Electronics' New 900 kHz Single-Channel Step-Down Switching
Regulator Delivers Space Savings and High Efficiency 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 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 result in a
compact, efficient and highly reliable switching power supply that is as simple
to design in and use as an LDO. Price: US$ 1.20 (OEM quantities) Availability: Now Delivery: 10-12
weeks ARO
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