EL SEGUNDO, Calif. - International Rectifier, IR®
introduced a new 20V DirectFET™ MOSFET synchronous buck converter chip set. The IRF6610 and IRF6636 small can
DirectFET MOSFET pair has performance similar to a pair of SO-8 MOSFETs with a 40% size reduction. The chip set is
designed for high frequency, point-of-load (POL) designs where size, efficiency and thermal performance are critical
design considerations.
"In 12V computing systems, the IRF6610 and
IRF6636 chip set is ideal for high density , 15A POL converters that support output voltages from 5V to below 1V,"
said Faisal Ahmad, Marketing Manager for DC-DC Computing Products at International Rectifier. "For example, a 500kHz
POL converter delivering 15A output current at 1.5V achieves greater than 88% efficiency with this chip set."
The IRF6610 features very low gate charge of 10nC, minimizing switching losses for an
optimized control FET function. The IRF6636 is a versatile DirectFET power MOSFET with 4.5mOhm device on-resistance
and a low gate charge of 18nC, and can be used as either a synchronous FET for 15A applications when coupled with an
IRF6610, or a as a control FET when used with the IRF6691 for 35A per phase, multi-phase applications. The
IRF6636/IRF6691 chip enables greater density in applications such as POL modules, replacing as many as four
thermally enhanced SO-8 MOSFET devices.
| Part Number |
Package |
BVDSS(V) |
RDS(on) max
@10V(mOhm) |
RDS(on) max @4.5V(mOhm) |
VGS(V) |
ID @
Tc=25ºC(A) |
QG typ(nC) |
QGD typ(nC) |
| IRF6610 |
DirectFET SQ |
20 |
8.0 |
10.0 |
20 |
50 |
10.0 |
2.0 |
| IRF6636 |
DirectFET
ST |
20 |
4.5 |
6.4 |
20 |
55 |
18 |
6.1 |
Patented DirectFET™
Packaging Technology
International Rectifier's patented DirectFET MOSFET packages
present a whole new set of design advantages not previously delivered by standard plastic discrete packages. Their
metal can construction enables dual-side cooling that effectively doubles the current handling capacity of high
frequency DC-DC buck converters powering advanced microprocessors. In addition, devices in the DirectFET package are
compliant with the Restriction of Hazardous Substances Directive (RoHS).
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