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Compact hot swap controller eases optical networks

Posted: 28 Jul 2008 ?? ?Print Version ?Bookmark and Share

Keywords:Hot Swap controller? optical networks? transceiver modules?

To protect boards and backplanes that use voltage supplies ranging from two 1V to 6V supplies, Linear Technology Corp. recently launched its LTC4224, a compact, low-power hot swap controller. Among the systems that will be benefited by this controller are the fiber optic networks having the simplified control with independent turn-on and adjustable ramp of the two supplies.

Earlier, multisource agreements like XENPAK have defined fiber optic transceiver modules that provide transmission rates up to 10Gbits/s over distances as long as 80km. At the same time, other versatile definitions like X2 or Xpak have emphasized smaller form factors for space-constrained applications. The controller supports the trend in shrinking modules by offering a compact hot swap solution when requiring minimal external components. It enables safe insertion and removal of a module into a rail by limiting any inrush currents large enough to create a glitch on the rail, which can cause other plug-in modules to malfunction.

The LTC4224 is compatible with optical networking, low-power hot swap control and electronic circuit breaker applications, especially whenever there is a very limited space available. It is properly supplied with power by one of the two monitored supplies and usually ensured by internal diode OR circuit, that whichever is greater, both of which can be turned on and off independently. At the same time, the LTC4224 can control a supply voltage as low as 1V, provided the other supply is 2.7V or higher.

An adjustable current limit allows users to match the current limit threshold to their load while a 5ms electronic circuit breaker monitors for an overcurrent condition and protects the external MOSFETs against shorts or excessive load currents. Peak fault currents are controlled in less than 1?s and an optional gate capacitor can be used to adjust the gate slew rate. Otherwise, all traditional Hot Swap timing parameters are internally generated to save board area if minimization of components is desired.

The LTC4224 has two versions: the LTC4224-1, which latches off after a fault, whereas the LTC4224-2 offers automatic retry after a fault. Commercial and industrial grades have different operating temperature ranges from 0C to 70C and -40C to 85C, respectively. The LTC4224 is available in 10-lead 3mm x 2mm DFN or 10-lead MSOP RoHS compliant packages.

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