LM25056A

www.ti.com

SNVS785A – JANUARY 2011 – REVISED APRIL 2013

LM25056A System Power Measurement IC with PMBus

Check for Samples: LM25056A

1

FEATURES

APPLICATIONS

234

•

Input Voltage Range: 3V to 17V

•

Server Backplane Systems

•

•

Base Station Power Distribution Systems

Command Structure

•

Subsystem Power Measurement

•

Remote Temperature Sensing with

Programmable Warning and Shutdown

DESCRIPTION

Thresholds

The LM25056A combines high performance analog

and digital technology with a PMBus™ compliant

•

12-bit Resolution and 1 kHz Sampling Rate

operating conditions of electrical systems including

•

Current Measurement Error: ±0.5%: +10°C to

computing and storage blades connected to a

+85°C

backplane power bus. The LM25056A continuously

•

Voltage Measurement Error: ±1.0%: +10°C

supplies

real-time

power,

voltage,

current,

and

temperature data to the system management host via

to+85°C

the SMBus interface.

•

Power Measurement Error: ±1.5%: +10°C to

+85°C

The LM25056A monitoring block captures both real-

time and average values of subsystem operating

•

True Input Power Measurement Using

power.

Accurate

power

measurement

is

Accurately Averages Dynamic Power Readings

accomplished by measuring the product of the input

•

voltage

and

current

through

a

shunt

resistor.

Programmable Interval Ranging from 0.001 to

LM25056A

current

measurement

has

a

±0.5%

4 Seconds

accuracy over the temperature range of +10°C to

+85°C with operation from -40°C to +125°C. A black

•

User Programmable WARN and FAULT

box (Telemetry/Fault Snapshot) function captures and

Thresholds with SMBA Notification

stores telemetry data and device status in the event

•

Black Box Capture of Telemetry

of a warning or a fault.

Measurements and Device Status Triggered by

WARN and FAULT Conditions

•

Full Featured Application Development

Software

•

WQFN-24 Package

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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

SMBus is a trademark of Intel Corp..

3

PMBus is a trademark of SMIF, Inc..

4

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2011–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.