Product category:
Power Supply ICs and Controllers
News Release from: Fairchild Semiconductor | Subject: FDC796N and FDC3616N
Edited by the Electronicstalk Editorial
Team on 28 May 2003
MOSFETs shrink in size, but not power
Two new highly efficient N-channel MOSFETs are each designed to handle 1.8W of power dissipation.
New from Fairchild Semiconductor are the 30V, 9mohm FDC796N and the100V, 70mohm FDC3616N These highly efficient N-channel mosfets are designed to handle 1.8W of power dissipation
This article was originally published on Electronicstalk on 28 Feb 2001 at 8.00am (UK)
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They are ideal solutions for small-form-factor DC/DC power supplies commonly found in applications ranging from telecommunications equipment, internet hubs and routers, to instrumentation and ATE equipment.
The FDC796N and the FDC3616N are the latest in of Fairchild's unique family of power mosfets that combine the company's PowerTrench technology and their advanced SuperSOT-6 FLMP (flipchip in a leaded moulded package).
The benefit to the designer is high performance in a package which takes up 70% less board space than an SO-8.
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Both the FDC796N and the FDC3616N offer extremely low on-resistance ratings and low gate charge (typically 14 and 23nC, respectively) in a package occupying 9mm2 of PCB area (the SO-8 package occupies 30mm2).
Fairchild's patented FLMP packaging eliminates conventional wire bonds and also provides an extremely low thermal resistance path between the PCB and the mosfet die (drain connection).
This can greatly improve performance compared with many other mosfet packages by reducing both the electrical and the thermal constraints.
For example, the FDC796N takes up to three times less PCB area than a device with similar thermal characteristics, such as the commonly used SO-8 package.
This saving in real estate aids designers in serving the growing industry trend towards much smaller eighth and sixteenth brick form factors for DC/DC convertors in telecomms and other applications.
Using a combination of the FDC3616N for the primary side switch locations, and the FDC796N for the synchronous rectifier sockets, provides an excellent solution for miniature half bridge, 48V telecomms input "onboard" DC/DC convertors.
In addition, the 30V FDC796N is well suited for use in synchronous buck POL (point of load), power supplies that can operate at switching frequencies up to 1MHz.
In this application, the low inductance SSOT-6 FLMP complements the low gate charge, low gate resistance mosfet process, allowing the switching losses to be further reduced.
"With continued advances in mosfet technology, one key challenge is to design packages that can keep up with silicon improvements", said David Grey, Fairchild's Technical Market Manager for DC/DC Convertor applications.
"The FLMP concept used in these two mosfets successfully reduces the electrical and thermal losses of the package to an absolute minimum".
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