1FEATURES

2• 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

APPLICATIONS

• Server Backplane Systems

• Base Station Power Distribution Systems

• Industrial Telemetry Applications

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.