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Power ICs support PMBus

Posted: 04 Jul 2011 ?? ?Print Version ?Bookmark and Share

Keywords:power management? power protection? PMBus support?

National Semiconductor Corp. has launched the 48V input voltage LM5066 and -48V input voltage LM5064, two high-voltage system power management and protection ICs with on-chip power management bus (PMBus) support.

According to National Semi, the ICs integrate high-performance system protection and management blocks that measure, control and manage the electrical operating conditions in systems such as routers, switches and base stations.�Additionally, the ICs allow comprehensive system power management for improving system reliability. The LM5066 and LM5064 also lowers power consumption in wired and wireless telecom infrastructure systems that operate from high-voltage system backplanes.

Ethernet routers and switches are often used alongside computing servers within data centers, driving the need for the same accurate measurement and control of power flow into each card.�In addition, new wireless base stations must control and measure the power to the remote radio heads located at the top of a tower. The LM5066 and LM5064 are highly integrated ICs that meet these demands using industry-standard PMBus interface that is software-compatible with the company's entire family of system protection and management products, National Semi stated.

National Semi adds that the LM5066 and LM5064 provide complete subsystem power management for high-voltage systems by precisely measuring the power to each card or block while continuously protecting against damaging inrush current surges due to hot swap or transient events that damage downstream components.

The LM5066 features a voltage input range of 10V to 80V and the LM5064 operates over a range of -9V to -80V. Both ICs have selectable 25mV/50mV current limit thresholds that address a wide range of intermediate bus voltages and load currents. A measurement block measures both current and voltage at 1,000 times per second with 4.5 percent accuracy over the full temperature range, the company said. Simultaneous sampling of current and voltage also provides true power measurement of the system's power consumption. The measurement block likewise captures the peak current and peak power and computes the average of subsystem operating parameters (Vin, Iin, Pin and Vout) over a user-programmable time frame, offloading the processing burden from an external microcontroller.

The company said the ICs continuously supply the system management host with real-time power, voltage, current and temperature data for each node in the system. The system management bus (SMBus) communications interface delivers this data via the PMBus protocol. The LM5066 and LM5064 report the status of all system parameters and fault conditions through the SMBus interface and offer individually programmable warning thresholds for all faults. This feature, according to National Semi, provides design flexibility and dynamic system protection. The host's system diagnostic and optimization routines use the data to increase system reliability and minimize overall power consumption.

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