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 Circuit breaker, Current limiting Fault response Auto-retry, Latch-off
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 Circuit breaker, Current limiting Fault response Auto-retry, Latch-off
WQFN (NHZ) 24 20 mm² 5 x 4
  • 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
    Threshold
  • Configurable Circuit Breaker Protection for Hard
    Shorts
  • Configurable Undervoltage and Overvoltage
    Lockouts With Hysteresis
  • Remote Temperature Sensing With
    Programmable Warning and Shutdown
    Thresholds
  • Detection and Notification of Damaged MOSFET
    Condition
  • Real-Time Monitoring of VIN, VOUT, IIN, PIN, VAUX
    With 12-bit Resolution and 1-kHz Sampling Rate
  • Current Measurement Accuracy: ±2.4% Over
    Temperature
  • Power Measurement Accuracy: ±3% Over
    Temperature
  • 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
    Condition
  • Full-Featured Application Design and
    Development GUI
  • 24-Lead WQFN Package
  • 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
    Threshold
  • Configurable Circuit Breaker Protection for Hard
    Shorts
  • Configurable Undervoltage and Overvoltage
    Lockouts With Hysteresis
  • Remote Temperature Sensing With
    Programmable Warning and Shutdown
    Thresholds
  • Detection and Notification of Damaged MOSFET
    Condition
  • Real-Time Monitoring of VIN, VOUT, IIN, PIN, VAUX
    With 12-bit Resolution and 1-kHz Sampling Rate
  • Current Measurement Accuracy: ±2.4% Over
    Temperature
  • Power Measurement Accuracy: ±3% Over
    Temperature
  • 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
    Condition
  • Full-Featured Application Design and
    Development GUI
  • 24-Lead WQFN Package

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.

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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Technical documentation

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

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

LM25066EVK — Evaluation Board for the LM25066

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 (...)

User guide: PDF
Not available on TI.com
GUI for evaluation module (EVM)

PI-Commander EVM GUI

SLVC572.ZIP (14513 KB)
lock = Requires export approval (1 minute)
Support software

LM25066 Design Calculator (Rev. G)

SNVU310G.ZIP (720 KB)
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)
Package Pins Download
WQFN (NHZ) 24 View options

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