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IR's New Dual MOSFETs Increase 6A Synchronous Buck Converter Efficiency by One Percent and Low Current Efficiency Up to Two Percent
EL SEGUNDO, Calif. —April 2006 — International Rectifier, IR®(NYSE: IRF), a world leader in power management
technology, today introduced four SO-8 30V dual HEXFET® MOSFETs for synchronous buck converter applications up
to 6A. The devices have optimized conduction, switching and body diode characteristics that maximize performance,
enabling cooler operation. When compared to similar devices on the market, these new MOSFETs deliver as much as
one percent better efficiency over their entire load range, and as much as two percent more efficiency under
light loads like those experienced during “sleep” or “standby” modes.
Housed in a single SO-8 packages, these dual devices offer a more compact footprint than using pairs of
individually-packaged transistors for notebook computers, compact desktop computers and other space-constrained
applications. They are also suitable for high performance DC-DC synchronous point-of-load (POL) converters used
in high-end servers and advanced telecom and datacom systems, as well as general-purpose buck converters up to 6A.
The IRF7904PbF and the IRF7907PbF each deliver as much as one percent higher efficiency over the entire load
range of 6A compared to similar competing devices. The IRF7902PbF and IRF7905PbF are for high efficiency
DC-DC converters up to 5A, and perform similarly at full load. However, at 2A, performance is
better by as much as 2% versus industry-standard devices. The IRF7902PbF and IRF7905PbF have similar electrical
characteristics, but have different pin-out configurations, while the IRF7904PbF and the IRF7907PbF match
pin-outs with the IRF7902PbF and the IRF7905PbF, respectively.
“This new family of dual MOSFETs is tuned for synchronous buck converter applications up to 6A. Low conduction
losses improve full load efficiency and thermal performance while the low switching losses help to achieve high
efficiency, even under light loads typically found in notebook computers,” said Jeff Sherman, International
Rectifier, Senior Marketing Manager, Portable Computing Solutions.
New International Rectifier 30V Dual HEXFET® Power MOSFETs for Portable Applications
| Part Number |
Package |
Control FET RDS(on) max @4.5V (mOhm) |
Sync FET RDS(on) max @4.5V (mOhm) |
VGS(V) |
ID @ Tc=70ºC (A) |
Control FET QG typ (nC) |
Sync FET QRR typ (nC) |
| IRF7902PbF |
SO-8 |
29.7 |
18.7 |
20 |
5.1 |
4.6 |
3.1 |
| IRF7904PbF |
SO-8 |
20.5 |
13 |
20 |
6.1 |
7.5 |
6.9 |
| IRF7905PbF |
SO-8 |
29.3 |
21.3 |
20 |
6.2 |
4.6 |
4.0 |
| IRF7907PbF |
SO-8 |
20.5 |
13.7 |
20 |
7.3 |
6.7 |
5.9 |
Availability and Pricing
Pricing for the IRF7902PbF, IRF7905PbF is US $0.60 each, while the IRF7904PbF and the IRF7907PbF is US $0.75 each in 10,000-unit quantities, and are available either in tubes or Tape & Reel. Prices are subject to change. The devices are lead-free and are compliant with the Restriction of Hazardous Substances Directive (RoHS).
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