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Product details

Parameters

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

Features

  • 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: ±1% Over Temperature
  • Power Measurement Accuracy: ±2% 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
  • Black Box Capture of Telemetry Measurements and Device Status Triggered by WARN or FAULT Condition
  • 24-Lead WQFN Package
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Description

The LM25066A 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 LM25066A continuously supplies real-time power, voltage, current, temperature and fault data to the system management host via the SMBus interface.

The LM25066A 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 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 LM25066A 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. LM25066A current measurement accuracy is ±1% over temperature.

The LM25066A 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 LM25066A System Power Management and Protection IC With PMBus™ datasheet (Rev. G) Nov. 11, 2016
Application note Basics of Power Switches (Rev. A) Apr. 26, 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
Application note Robust Hot Swap Design (Rev. A) Apr. 08, 2015
User guide AN-2100 LM25066 Evaluation Board (Rev. C) Apr. 26, 2013

Design & development

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

Software development

GUI FOR EVALUATION MODULE (EVM) Download
SLVC572.ZIP (14513 KB)
SUPPORT SOFTWARE Download
SNVU310G.ZIP (720 KB)

Design tools & simulation

SIMULATION MODEL Download
SNVM476A.ZIP (62 KB) - PSpice Model
SIMULATION TOOL Download
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 (...)
Features
  • 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
  • (...)
CALCULATION TOOL Download
SNVR505.ZIP (523 KB)

Reference designs

REFERENCE DESIGNS Download
Complete PMBus Power System for Enterprise Ethernet Switches Reference Design
PMP10896 Complete PMBus power system for 3 ASIC/FPGA cores, DDR3 core memory, and auxiliary voltages found on high-performance Ethernet Switches.
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
WQFN (NHZ) 24 View options

Ordering & quality

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  • MSL rating/Peak reflow
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  • Qualification summary
  • Ongoing reliability monitoring

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