LM25066 System Power Management and Protection IC with PMBus | TI.com

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System Power Management and Protection IC with PMBus


Recommended alternative parts

  • LM25066A  -  System Power Management And Protection IC With PMBus
  • LM25069  -  Positive Low Voltage Power Limiting Hot Swap Controller
  • LM5066  -  High Voltage System Power Management And Protection IC With PMBus


The LM25066 combines a high-performance hot-swap controller with a PMBus™ compliant SMBus/I2C interface 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 SMBus interface.

The LM25066 control block includes a unique hot-swap architecture that provides current and power limiting to protect sensitive circuitry during insertion of boards into a live system backplane, or any other hot power source. A fast acting circuit breaker prevents damage in the event of a short circuit on the output. The input undervoltage and overvoltage levels and hysteresis are configurable, as well as the insertion delay time and fault detection time. A temperature monitoring block on the LM25066 interfaces with a low-cost external diode for monitoring the temperature of the external MOSFET or other thermally sensitive components. The POWER GOOD output provides a fast indicator when the input and/or output voltages are outside their programmed range. LM25066 current measurement accuracy is ±2.4% over temperature.

The LM25066 monitoring block computes both the real-time and average values of subsystem operating parameters (VIN, IIN, PIN, VOUT) as well as the peak power. Accurate power averaging is accomplished by averaging the product of the input voltage and current. A black box (Telemetry/Fault Snapshot) function captures and stores telemetry data and device status in the event of a warning or a fault.


  • Input Voltage Range: 2.9 V to 17 V
  • I2C/SMBus Interface and PMBus™ Compliant
    Command Structure
  • Programmable 25-mV or 46-mV Current Limit
  • Configurable Circuit Breaker Protection for Hard
  • Configurable Undervoltage and Overvoltage
    Lockouts With Hysteresis
  • Remote Temperature Sensing With
    Programmable Warning and Shutdown
  • Detection and Notification of Damaged MOSFET
  • Real-Time Monitoring of VIN, VOUT, IIN, PIN, VAUX
    With 12-bit Resolution and 1-kHz Sampling Rate
  • Current Measurement Accuracy: ±2.4% Over
  • Power Measurement Accuracy: ±3% Over
  • True Input Power Measurement Using
    Simultaneous Sampling of VIN and IIN Accurately
    Averages Dynamic Power Readings
  • Averaging of VIN, IIN, PIN, and VOUT Over
    Programmable Interval Ranging from 0.001 to
    4 Seconds
  • Programmable WARN and FAULT Thresholds
    With SMBA Notification
  • Blackbox Capture of Telemetry Measurements
    and Device Status Triggered by WARN or FAULT
  • Full-Featured Application Design and
    Development GUI
  • 24-Lead WQFN Package


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Part number Order FET Vin (Min) (V) Vin (Max) (V) Vabsmax_cont (V) Current limit (Min) (A) Current limit (Max) (A) Overcurrent response Current limit type UL recognition Fault response Current limit function enabled Rating Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
LM25066 Order now External     2.9     17     24     0.01     500     Current Limiting     Adjustable     No     Auto Retry
Latch Off    
Always     Catalog     -40 to 125     WQFN | 24     24WQFN: 20 mm2: 4 x 5 (WQFN | 24)