Product details


FET External Vin (Min) (V) 2.9 Vin (Max) (V) 17 Vabsmax_cont (V) 24 Current limit (Min) (A) 0.01 Current limit (Max) (A) 500 Overcurrent response Current limiting, Circuit breaker Fault response Auto Retry, Latch Off UL recognition open-in-new Find other eFuses & hot swap controllers

Package | Pins | Size

WQFN (NHZ) 24 20 mm² 5 x 4 open-in-new Find other eFuses & hot swap controllers


  • 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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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.

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LM25066A ACTIVE 2.9-V to 17-V hot swap controller with I2C and PMBus with increased monitoring accuracy This product has a higher current monitor accuracy..
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LM5066 ACTIVE 10-V to 80-V hot swap controller with current, -Voltage and power monitoring and PMBus This product has a higher input voltage range (9-80V).
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Technical documentation

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Type Title Date
* Data sheet LM25066 System Power Management and Protection IC With PMBus™ datasheet (Rev. J) Jan. 06, 2016
E-book 11 Ways to Protect Your Power Path white paper Jul. 03, 2019
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Technical article Simplify digital hot swap design using the PI-Commander GUI Jun. 06, 2016
Technical article Building blocks of power Mar. 23, 2016
Technical article Simplify robust hot-swap design using design calculator tools Mar. 04, 2016
Selection guide Hot Swap Selection Tool Jul. 28, 2015
Application note Handling System Transients in Hot Swap Applications May 08, 2015
Application note Robust Hot Swap Design (Rev. A) Apr. 08, 2015
User guide AN-2100 LM25066 Evaluation Board (Rev. C) Apr. 26, 2013
User guide AN-2160 LM5066 Evaluation Board (Rev. A) Apr. 26, 2013

Design & development

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Hardware development

document-generic User guide

The LM25066EVK evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LM25066 hot-swap controller with PMBUS compliant SMBUS/I2C interface to accurately measure, protect and control the electrical operating conditions of systems connected to a backplane power bus. The EVM (...)

Software development

SLVC572.ZIP (14513 KB)
SNVU310G.ZIP (720 KB)

Design tools & simulation

PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
SNVR505.ZIP (523 KB)

CAD/CAE symbols

Package Pins Download
WQFN (NHZ) 24 View options

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