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3 to 80V, 12-bit, pmbus output current/voltage/power/temperature monitor

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LM5056APMHX/NOPB General Description

The LM5056/LM5056A combines high-performance analog and digital technology with a PMBus compliant SMBus™ and I2C interface to accurately measure the electrical operating conditions of systems connected to a backplane power bus. The LM5056/LM5056A continuously supplies real-time power, voltage, current, temperature and fault data to the system management host via the SMBus interface.

The LM5056/LM5056A 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 and fault snapshot) function captures and stores telemetry data and device status in the event of a warning or a fault.

Texas Instruments, Inc Inventory

Key Features

  • Input Voltage Range: 10 V to 80 V
  • Real-Time Monitoring of VIN, IIN, PIN, VOUT, and VAUX with 12-bit resolution, 1-kHz sampling rate
  • True input Power Measurement using simultaneous sampling of Vin and Iin
  • Remote Temperature Sensing with programmable warning thresholds
  • Power Measurement Accuracy
    • LM5056A: ±1.75%
    • LM5056: ±2.25%
  • Current Measurement Accuracy
    • LM5056A: ±1.25%
    • LM5056: ±1.5%
  • Voltage Measurement Accuracy: ±1.0%
  • Averaging of VIN, IIN, PIN, and VOUT with Programmable Interval Ranging from 0.001 s to 4 s
  • Programmable WARN and FAULT Thresholds with SMBA Notification
  • Black-Box Capture of Telemetry Measurements and Device Status Triggered by WARN or FAULT Condition
  • I2C/SMBus Interface and PMBus Compliant Command Structure

PMBus is a trademark of Texas Instruments.

Texas Instruments, Inc Original Stock
Texas Instruments, Inc Inventory


Common-mode voltage (max) (V) 80 Common-mode voltage (min) (V) 10
Input offset (±) (max) (µV) 300 Voltage gain (V/V) 0.5, 1
Supply voltage (max) (V) 5.5 Supply voltage (min) (V) 4.5
Iq (max) (mA) 6.8 Digital interface I2C, PMBus, SMBus
Gain error (%) 1.25 Features Digital Temp Monitor
Resolution (Bits) 12 Power measurement accuracy (%) 1.75
Rating Catalog Operating temperature range (°C) -40 to 125
feature-function Server Backplane Systems feature-switching-frequency-khz
feature-process-technology feature-input-voltage-v 10 to 80
feature-minimum-operating-supply-voltage-v 4.5 feature-maximum-operating-supply-voltage-v 5.5
feature-maximum-power-dissipation-mw feature-packaging Tape and Reel
feature-rad-hard feature-pin-count 28
feature-supplier-package HTSSOP EP feature-standard-package-name SOP
feature-cecc-qualified No feature-esd-protection
feature-military No feature-aec-qualified No
feature-aec-qualified-number feature-eccn-code EAR99
feature-svhc No feature-svhc-exceeds-threshold No

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