LM25056A

ACTIVE

17-V PMBus Current/Voltage/Power/Temperature Monitor

Product details

Common-mode voltage (max) (V) 17 Common-mode voltage (min) (V) 3 Input offset (±) (max) (µV) 250 Voltage gain (V/V) 0.5, 1 Supply voltage (max) (V) 17 Supply voltage (min) (V) 3 Iq (max) (mA) 2.8 Digital interface PMBus Gain error (%) 1.5 Features Digital Temp Monitor, PMBUS, Supports Telemetry Data Storage Power measurement accuracy (%) 1.5 Rating Catalog Operating temperature range (°C) -40 to 125
Common-mode voltage (max) (V) 17 Common-mode voltage (min) (V) 3 Input offset (±) (max) (µV) 250 Voltage gain (V/V) 0.5, 1 Supply voltage (max) (V) 17 Supply voltage (min) (V) 3 Iq (max) (mA) 2.8 Digital interface PMBus Gain error (%) 1.5 Features Digital Temp Monitor, PMBUS, Supports Telemetry Data Storage Power measurement accuracy (%) 1.5 Rating Catalog Operating temperature range (°C) -40 to 125
WQFN (NHZ) 24 20 mm² 5 x 4
  • Input Voltage Range: 3V to 17V
  • I2C/SMBus Interface with PMBus Compliant Command Structure
  • Remote Temperature Sensing with Programmable Warning and Shutdown Thresholds
  • Real Time Monitoring of VIN, IIN, PIN, VAUX with 12-bit Resolution and 1 kHz Sampling Rate
  • Current Measurement Error: ±0.5%: +10°C to +85°C
  • Voltage Measurement Error: ±1.0%: +10°C to+85°C
  • Power Measurement Error: ±1.5%: +10°C to +85°C
  • True Input Power Measurement Using Simultaneous Sampling of VIN and IIN Accurately Averages Dynamic Power Readings
  • Averaging of VIN, IIN, PIN, and VAUX Over Programmable Interval Ranging from 0.001 to 4 Seconds
  • User Programmable WARN and FAULT Thresholds with SMBA Notification
  • Black Box Capture of Telemetry Measurements and Device Status Triggered by WARN and FAULT Conditions
  • Full Featured Application Development Software
  • WQFN-24 Package

All trademarks are the property of their respective owners.

  • Input Voltage Range: 3V to 17V
  • I2C/SMBus Interface with PMBus Compliant Command Structure
  • Remote Temperature Sensing with Programmable Warning and Shutdown Thresholds
  • Real Time Monitoring of VIN, IIN, PIN, VAUX with 12-bit Resolution and 1 kHz Sampling Rate
  • Current Measurement Error: ±0.5%: +10°C to +85°C
  • Voltage Measurement Error: ±1.0%: +10°C to+85°C
  • Power Measurement Error: ±1.5%: +10°C to +85°C
  • True Input Power Measurement Using Simultaneous Sampling of VIN and IIN Accurately Averages Dynamic Power Readings
  • Averaging of VIN, IIN, PIN, and VAUX Over Programmable Interval Ranging from 0.001 to 4 Seconds
  • User Programmable WARN and FAULT Thresholds with SMBA Notification
  • Black Box Capture of Telemetry Measurements and Device Status Triggered by WARN and FAULT Conditions
  • Full Featured Application Development Software
  • WQFN-24 Package

All trademarks are the property of their respective owners.

The LM25056A combines high performance analog and digital technology with a PMBus compliant SMBus/I2C interface to accurately measure the operating conditions of electrical systems including computing and storage blades connected to a backplane power bus. The LM25056A continuously supplies real-time power, voltage, current, and temperature data to the system management host via the SMBus interface.

The LM25056A monitoring block captures both real-time and average values of subsystem operating parameters (VIN, IIN, PIN, VAUX) as well as peak power. Accurate power measurement is accomplished by measuring the product of the input voltage and current through a shunt resistor. LM25056A current measurement has a ±0.5% accuracy over the temperature range of +10°C to +85°C with operation from -40°C to +125°C. 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 LM25056A combines high performance analog and digital technology with a PMBus compliant SMBus/I2C interface to accurately measure the operating conditions of electrical systems including computing and storage blades connected to a backplane power bus. The LM25056A continuously supplies real-time power, voltage, current, and temperature data to the system management host via the SMBus interface.

The LM25056A monitoring block captures both real-time and average values of subsystem operating parameters (VIN, IIN, PIN, VAUX) as well as peak power. Accurate power measurement is accomplished by measuring the product of the input voltage and current through a shunt resistor. LM25056A current measurement has a ±0.5% accuracy over the temperature range of +10°C to +85°C with operation from -40°C to +125°C. 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 System Power Measurement IC with PMBus. datasheet (Rev. A) 05 Apr 2013
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Selection guide Hot Swap Selection Tool 28 Jul 2015
User guide AN-2144 LM25056 Evaluation Board 16 Jan 2012

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