LM25066 Datasheet PDF - National Semiconductor Corporation

Part Number LM25066
Description System Power Management And Protection IC
Manufacturers National Semiconductor Corporation 
Logo National Semiconductor Corporation Logo 

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LM25066 datasheet, circuit
February 19, 2010
System Power Management and Protection IC with PMBus
General Description
The LM25066 combines high performance analog and digital
technology to accurately measure, protect and control the
electrical operating conditions of computing and storage
blades connected to a backplane power bus. The LM25066
continuously supplies real-time power, voltage, current, tem-
perature and fault data to the system management host via
the I2C/SMBus interface with PMBus compliant protocol. The
LM25066 monitoring block captures peak power and com-
putes the average of subsystem operating parameters (Vin,
Iin, Pin, Vout). LM25066 current measurement is ±3% accu-
rate over the operating temperature range of -40°C to 125°C.
The LM25066 protection block utilizes provides adjustable
under/overvoltage and hysteresis. A temperature monitoring
block on the LM25066 interfaces with a low-cost external
diode for monitoring the temperature of the external MOSFET
or other critical temperature source. The temperature sensor
can be used to protect against MOSFET overheating. The
LM25066 reports the status of all system warning and fault
conditions and offers programmable warning thresholds
through the SMBus interface. This feature provides design
flexibility and dynamic system protection.
The LM25066 control block includes unique hot-swap archi-
tecture that provides current and power limiting to protect
sensitive circuitry during insertion of boards from a live system
backplane, or any other "hot" power source.
Operating range: +2.9V to +17V
Current Limit Threshold: 25 mV or 50 mV
I2C/SMBus interface and PMBus compliant command
Real time system telemetry monitoring
Current measurement accuracy: ±3%, 25 mV threshold,
-40°C to 125°C
True Input Power from simultaneous sampling of VIN and
Power limited control of hotswap insertions, inrush current,
circuit breaker functions
Multi-level configuration and monitoring of system fault
conditions via PMBus
Full featured application design and development
Server Backplane Systems
Base Station Power Distribution Systems
Solid State Circuit Breaker
24-Lead LLP Package
Block Diagram
© 2010 National Semiconductor Corporation 301158

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