Product category: Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LTC4355
Edited by the Electronicstalk Editorial Team on 27 August 2007
Diode controller raises supply
reliability
Dual ideal diode-OR controller allows Schottky diodes to be replaced by N-channel MOSFETs in high availability systems.
The LTC4355 dual ideal diode-OR controller from Linear Technology allows Schottky diodes to be replaced by N-channel MOSFETs in high availability systems and provides extensive fault monitoring to diagnose supply failures Forming the diode-OR of input supplies in this manner reduces power consumption, heat dissipation and PC board area
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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The wide operating range of 9 to 80V supports diode-OR applications with two positive supplies, such as a 12V distributed bus architecture or the return paths of two negative supplies, as in -48V AdvancedTCA (ATCA) applications.
Additionally, the LTC4355 monitors and separately signals several types of faults: if the input supplies are not in regulation, if the inline fuses are blown, or if the voltages across the MOSFETs are greater than the fault threshold.
In high-power high-availability applications such as ATCA, where redundant supplies and redundant returns are mandated, the power and heat dissipation of ORing diodes can be excessive and therefore MOSFETs provide a more efficient solution.
The LTC4355 provides the gate drive for external N-channel MOSFETs, fast turnoff to prevent reverse current and smooth switchover between supplies without oscillation.
The LTC4355 positive diode-OR controller complements the LTC4354 negative diode-OR controller, as well as Linear's extensive family of Hot Swap controllers, including the LTC4252A with tight under/overvoltage tolerance and the LTC4261 with an internal ADC for extensive monitoring.
Specified over the commercial and industrial temperature ranges, the LTC4355 is offered in 4 x 3mm 14-lead DFN and 16-lead SOIC packages.
Available from stock, pricing begins at US $2.50 each in 1000 piece quantities. Request a free brochure from Linear Technology Corp ...
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