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.