HV power management chips for telecom equipment supports PMBus
Date: 30/06/2011
National Semiconductor Corp. has introduced two new high-voltage system power management and protection integrated circuits (ICs) with on-chip power management bus (PMBus) support. The 48V input voltage LM5066 and -48V input voltage LM5064 has protection and management functions for measuring, controling and managing the electrical operating conditions in telecom systems such as routers, switches and base stations. The LM5066 and LM5064 are suggested for use in designing wired and wireless telecom infrastructure systems that operate from high-voltage system backplanes.
The LM5066 and LM5064 uses industry-standard PMBus interface that is software-compatible with National's entire family of system protection and management products.
The LM5066 and LM5064 precisely measure 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 new ICs use National's hot swap architecture that continuously monitors and limits both system current and power while accurately measuring power consumption and fault conditions. The ICs continuously supply the system management host with real-time power, voltage, current, temperature and fault data for each node in the system. The system management bus (SMBus) communications interface delivers this data via the PMBus protocol. The host's system diagnostic and optimization routines use the data to increase system reliability and minimize overall power consumption.
Technical Features of the LM5066 and LM5064 System Power Management and Protection ICs
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 25 mV/50 mV current limit thresholds for addressing 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. Additionally, simultaneous sampling of current and voltage provides true power measurement of the system's power consumption. The measurement block also 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.
A temperature-monitoring block interfaces with a low-cost external diode to measure temperature of the external MOSFET or other critical temperature source. 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 provides design flexibility and dynamic system protection.
All of National's systems protection and power management products use the same evaluation tool and Graphic User Interface (GUI).
Availability: Now in samples, production in volumes from August.
Package: 28-pin thermally enhanced TSSOP package
Price: US$4.95 for each of 1K units.
For more information on National's hot swap controller products, visit http://www.national.com/
