Product category: Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LTC4261
Edited by the Electronicstalk Editorial Team on 09 January 2006
Hot-swap controller watches voltage and
current
The LTC4261 negative high-voltage hot-swap controller allows sophisticated power monitoring by measuring card voltages and currents as well as recording past and present fault conditions.
Linear Technology has introduced the LTC4261, a negative high-voltage hot-swap controller It features an onboard 10bit ADC and I2C compatible interface, allowing sophisticated power monitoring by measuring card voltages and currents as well as recording past and present fault conditions
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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The LTC4261 complements Linear Technology's LTC4260, a positive 48V hot-swap controller that also features an onboard ADC and I2C interface.
Information in the ADC's registers can be queried via the I2C 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 -12 to -100V and hot-swap capabilities, make the LTC4261 ideally suited for high availability telecom/network equipment, such as AdvancedTCA systems.
In these systems, careful monitoring of the health and integrity of the power distribution networks is crucial.
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.
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 "power good" within a timeout period.
Specified over the commercial and industrial temperature ranges, the LTC4261 is available from stock in 28-lead SSOP and 24-lead 4 x 5mm QFN packages.
Pricing begins at $5.95 each in 1000-piece quantities. Request a free brochure from Linear Technology Corp ...
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