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PCIe controller targets storage, embedded apps

Posted: 22 Dec 2006     Print Version  Bookmark and Share

Keywords:Linear Technology  LTC4242  PCI Express  controller  storage servers 

Linear Technology Corp. has introduced the LTC4242, a narrow, dual-slot PCI Express hot swap controller for mid-range networking or storage servers and embedded applications. The device simplifies the application by eliminating complex software interfaces, yet provides a rugged and compact solution for independently controlling the main supplies (12V and 3.3V) and the auxiliary (3.3V AUX) supply on two slots. Each supply is continuously monitored for under-voltage and over-current faults. The 12V supply inputs are protected up to 20V, providing increased ruggedness.

Together with analogue current limit amplifiers, electronic circuit breakers with adjustable response time provide dual level over-current protection. Control for the auxiliary supplies is completely independent with separate ON and FAULT pins. The internal 3.3V AUX MOSFET features a low 0.25Ohm ON resistance which, together with the exposed backside metal on the QFN package and thermal shutdown protection, minimises heat in the device. A separate VCC pin allows the part to power up without the main supplies being present and the ability to ride out glitches in the auxiliary supply, ensuring continuous reliable operation.

The 5-by-7mm QFN package is narrow enough to fit between the PCI Express connectors if needed for board space optimisation. The optional leaded package, 36-pin SSOP, is a proprietary package designed for narrow applications, requiring less than 8mm including the landing area for the pins. Despite the small form factor, the controller offers independent control of the main and auxiliary supplies for each port, separate FAULT outputs for main and auxiliary supplies, power-good outputs for each slot and board-present inputs for each slot.

Specified over the commercial and industrial temperature ranges, the LTC4242 is offered in 5-by-7mm 38-lead QFN and 36-lead SSOP packages. Available from stock, pricing begins at Rs.150.22 ($3.30) each in 1,000 piece quantities.

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Related Datasheets
Part Number Description Category
LTC4242 Dual Slot Hot Swap Controller for PCI Express ICs, Interface



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