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New negative high-voltage hot swap controller from Linear Tech

Posted: 05 Oct 2005 ?? ?Print Version ?Bookmark and Share

Keywords:linear technology? ltc4261? hot swap controller?

Linear Technology Corp. unveiled a negative high-voltage Hot Swap controller that features an onboard 10-bit ADC and I?C compatible interface, allowing sophisticated power monitoring by measuring card voltages and currents as well as recording past and present fault conditions. According to the company, the new LTC4261 complements its LTC4260, a positive 48V Hot Swap controller that also features an onboard ADC and I?C interface.

Information in the ADC's registers can be queried via the I?C bus and then used to determine if a card is actually using its allocated power, or operating abnormally. An irregular card can be flagged for service even before it fails. This advanced power monitoring, combined with a wide input voltage range of -12V to -100V and Hot Swap capabilities, make the LTC4261 suitable for high availability telecom/network equipment, such as AdvancedTCA systems.

The LTC4261 is also designed to turn the supply voltage on and off in a controlled manner. The active current limiting results in a controlled rise in voltage across the card capacitance and protects the backplane supply from voltage drops. The inrush and overcurrent limits, as well as the undervoltage/overvoltage thresholds and hysteresis are independently adjustable, giving maximum flexibility and accuracy to proprietary designs, added Linear Tech. The controller disconnects the load if it remains in current limit beyond the time-out delay and can be configured to latch off or auto-retry following the event.

The LTC4261 has additional features to interrupt the host when a fault has occurred, notify when output power is good, detect insertion of a board, and turn off the pass transistor if an external supply monitor fails to indicate powergood within a timeout period.

Specified over the commercial and industrial temperature ranges, this new product is available from stock in 28-lead SSOP and 24-lead 4-by-5mm QFN packages. Pricing begins at $5.95 each in 1,000-piece quantities.

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