Power management controller
2.9 -17 V National Semiconductor

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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, temperature 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 computes the average of subsystem operating parameters (Vin, Iin, Pin, Vout). LM25066 current measurement is ±3% accurate 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 architecture 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.

Applications
- Server Backplane Systems
- Base Station Power Distribution Systems
- Solid State Circuit Breaker