1. International Rectifier Introduces 100V-Rated Integrated MOSFET Solution for
PoE Applications Slashing Footprint Up To 80%
EL SEGUNDO, Calif. — December 2005 — International Rectifier, IR® (NYSE: IRF), a world leader in
power management technology, today introduced the IRF4000, a 100V-rated device integrating four
HEXFET® MOSFETs into a single Power MLP package for Power-over-Ethernet (PoE) applications. The
new device complies to the IEEE 802.3af specification for networking and communications
infrastructure systems, such as Ethernet switches, routers and hubs, delivering up to 15W per port,
replacing four individual SOT-223-packaged MOSFETs. The reduced footprint equates to a space
savings of up to 80%, or three square inches of circuit board area in a typical 48-port board.
“Considering that each port in a PoE card requires its own MOSFET, the IRF4000 significantly reduces
part count over the alternative of using individual MOSFETs in the same circuit. Manufacturing can
also be simplified, eliminating 36 component insertions in a 48-port system,” said Carl Smith,
marketing manager for networking and telecommunication products at International Rectifier.
The IEEE 802.3af specification outlines power delivery requirements from the power sourcing
equipment (PSE) through the LAN cable to the powered device (PD) in a networking system. The
MOSFET operates like a hot-swap FET, transferring power from the PSE to the PD in a controlled
fashion, and must operate in the linear region through a demanding worst-case operating condition
therefore requiring an extremely robust safe operating area (SOA).
The low transconductance silicon technology used in the IRF4000 combines with about 1°C/W
package thermal resistance to enable efficient removal of heat while operating in the linear region and
has been fully electrically and thermally characterized under worst case IEEE 802.3af operating
conditions. The new device guarantees a 56% higher device safe operating area compared to
individual SOT-223 MOSFETs, improving system reliability and thermal margin.
In addition to 48-port systems, the IRF4000 is ideal for 96-port applications or for smaller PoE “jack
companion” modules using 12-ports where, in each case, four ports can be addressed with a single
IRF4000 device. The new device is qualified to industrial moisture sensitivity level (MSL) 3.
In addition to the IEEE 802.3af specification, the IRF4000 is compliant with the upcoming PoE Plus
architecture for high power loads.
Part
Number
Package VDSS
RDS(on)
max
12Vgs
RDS(on)
max
10Vgs
Idss @
100V
Rthj-lead
IRF4000
10mm(l) x 5mm(w) x
1.85mm (h) Power MLP
100V
270mOhm @
12Vgs
350mOhm @
10Vgs
1.5uA
max
1.5°C/W
max
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Page 1 of 2International Rectifier Introduces 100V-Rated Integrated MOSFET Solution for PoE Application...
3/17/2008http://www.irf.com/whats-new/nr051220.html
