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LM5066I

ACTIVE

10-V to 80-V hot swap controller with improved current, voltage and power monitoring accuracy

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Data sheet

LM5066I

ACTIVE
Data sheet Order now

Product details

Vabsmax_cont (V) 100 Vin (max) (V) 80 Vin (min) (V) 10 Features Adjustable OVLO, Current monitoring, Fault output, Overvoltage protection, PMBus, Power good signal, Short circuit protection, adjustable UVLO Overcurrent response Circuit breaker, Current limiting Fault response Auto-retry, Latch-off Overvoltage response Cut-off Rating Catalog Soft start Adjustable Quiescent current (Iq) (typ) (A) 0.0056 Quiescent current (Iq) (max) (A) 0.007 Device type eFuses and hot swap controllers Operating temperature range (°C) -40 to 125
Vabsmax_cont (V) 100 Vin (max) (V) 80 Vin (min) (V) 10 Features Adjustable OVLO, Current monitoring, Fault output, Overvoltage protection, PMBus, Power good signal, Short circuit protection, adjustable UVLO Overcurrent response Circuit breaker, Current limiting Fault response Auto-retry, Latch-off Overvoltage response Cut-off Rating Catalog Soft start Adjustable Quiescent current (Iq) (typ) (A) 0.0056 Quiescent current (Iq) (max) (A) 0.007 Device type eFuses and hot swap controllers Operating temperature range (°C) -40 to 125
HTSSOP (PWP) 28 62.08 mm² (9.7 mm × 6.4 mm)
  • 10- to 80-V Operation
  • 100-V Continuous Absolute Max
  • 26 mV or 50 mV ILIM Threshold (±10%)
  • Programmable FET SOA Protection
  • Programable UV, OV, tFAULT Thresholds
  • External FET Temperature Sensing
  • Failed FET Detection
  • I2C / SMBus Interface
  • PMBus and Node Manager 2.0 and 3.0 Compliant Command Structure
  • Precision V IN, VOUT, IIN, PIN, VAUX Monitoring
    • V (±1.25%); I (±1.75%); P (±2.5%)
  • Supports Energy Monitoring via Read_EIN Command
  • Programable I/V/P Averaging Interval
  • 12-bit ADC with 1-kHz Sampling Rate
  • –40°C < TJ < 125°C Operation
  • 10- to 80-V Operation
  • 100-V Continuous Absolute Max
  • 26 mV or 50 mV ILIM Threshold (±10%)
  • Programmable FET SOA Protection
  • Programable UV, OV, tFAULT Thresholds
  • External FET Temperature Sensing
  • Failed FET Detection
  • I2C / SMBus Interface
  • PMBus and Node Manager 2.0 and 3.0 Compliant Command Structure
  • Precision V IN, VOUT, IIN, PIN, VAUX Monitoring
    • V (±1.25%); I (±1.75%); P (±2.5%)
  • Supports Energy Monitoring via Read_EIN Command
  • Programable I/V/P Averaging Interval
  • 12-bit ADC with 1-kHz Sampling Rate
  • –40°C < TJ < 125°C Operation

LM5066I provides robust protection and precision monitoring for 10- to 80-V systems. Programmable UV, OV, ILIMIT, and fast-short circuit protection allow for customized protection for any application. Programmable FET SOA protection sets the maximum power the FET is allowed to dissipate under any condition. The programmable fault timer (tFAULT) is set to avoid nuisance trips, ensure start-up, and limit the duration of over load events.

In addition to circuit protection, the LM5066I supplies real-time power, voltage, current, temperature, and fault data to the system management host through the I2C / SMBus interface. PMBus compliant command structure makes it easy to program the device. Precision telemetry enables intelligent power management functions such as efficiency optimization and early fault detection. LM5066I also supports advanced features such as I/V/P averaging and peak power measurment to improve system diagnostics.

LM5066I is pin-to-pin compatible with the LM5066 and offers improved telemetry accuracy and supports the Read_Ein command to monitor energy. See for a detailed comparison.

LM5066I provides robust protection and precision monitoring for 10- to 80-V systems. Programmable UV, OV, ILIMIT, and fast-short circuit protection allow for customized protection for any application. Programmable FET SOA protection sets the maximum power the FET is allowed to dissipate under any condition. The programmable fault timer (tFAULT) is set to avoid nuisance trips, ensure start-up, and limit the duration of over load events.

In addition to circuit protection, the LM5066I supplies real-time power, voltage, current, temperature, and fault data to the system management host through the I2C / SMBus interface. PMBus compliant command structure makes it easy to program the device. Precision telemetry enables intelligent power management functions such as efficiency optimization and early fault detection. LM5066I also supports advanced features such as I/V/P averaging and peak power measurment to improve system diagnostics.

LM5066I is pin-to-pin compatible with the LM5066 and offers improved telemetry accuracy and supports the Read_Ein command to monitor energy. See for a detailed comparison.
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Technical documentation

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* Data sheet LM5066I 10 to 80 V, Hotswap Controller With I/V/P Monitoring and PMBus Interface datasheet (Rev. C) PDF | HTML Jul 20, 2016
Analog design Journal Analog Design Journal - Issue 1, 2025 PDF | HTML Jun 27, 2025
Analog design Journal Addressing the protection challenges of 48V AI servers using hot-swap controllers PDF | HTML May 5, 2025
Analog design Journal Optimizing signal chain cost and accuracy for isolated current sensing in energy metering PDF | HTML Apr 30, 2025
Analog design Journal Transient protection design for power switches to achieve robust reliable power-path protection PDF | HTML Apr 23, 2025
Application note Implementation of PSYS Monitor Using TPS25984, TPS25985, or TPS25990 eFuses PDF | HTML Nov 15, 2023
E-book 11 Ways to Protect Your Power Path Jul 3, 2019
Application note Minimizing System Down-time with Smart eFuses Jun 12, 2019
Technical article Simplify digital hot swap design using the PI-Commander GUI PDF | HTML Jun 6, 2016
Application note Handling System Transients in Hot Swap Applications May 8, 2015
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Design & development

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

Evaluation board

LM5066IEVM-626 — LM5066IEVM-626 Evaluation Module with PMBus

The LM5066IEVM-626 evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LM5066I high-performance hot-swap controller with PMBUS compliant SMBUS/I2C interface to accurately measure, protect and control the electrical operating conditions of systems connected to a (...)

User guide: PDF
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Driver or library

SLVC576 — LGPL Library Source Used by PI-Commander

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GUI for evaluation module (EVM)

SLVC572 — PI-Commander EVM GUI

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Simulation model

LM5066I Unencrypted PSpice Transient Model Package (Rev. A)

SNVM587A.ZIP (127 KB) - PSpice model
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Calculation tool

SLVC577 — LM5066I Design Calculator

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Calculation tool

SNVR507 — LM5066I Design Calculator With FET Recommendation

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Calculation tool

TVS-RECOMMENDATION-CALC — TVS diode recommendation tool

This tool suggests suitable TVS for given system parameters and abs max voltage rating of the device.
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Reference design

PMP23496 — 8kW hot-swap reference design for 48V artificial intelligence servers

With the advancements in artificial intelligence (AI) and machine learning (ML), enterprise servers have become power-intensive as these servers simultaneously process a large amount of data and storage. The steady-state power rating of each server motherboard has gone up 5kW to 6kW, in contrast to (...)

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