1FEATURES
2• Fully Node Manager 2.0 and 2.5 Compliant with
I2C/SMBus interface and PMBus™ compliant
command structure
• Input voltage range: 2.9V to 17V
• Programmable 25mV or 46mV current limit
threshold
• Read_EIN accurately measures true input
power via simultaneous sampling
• Configurable circuit breaker protection for
hard shorts
• Configurable under- and over-voltage lockouts
with hysteresis
• Real time monitoring of VIN, VOUT, IIN, PIN, VAUX
with 12-bit resolution and 1 kHz sampling rate
• Current measurement accuracy: ±1%
(LM25066IA) and Power measurement
accuracy: ±2.0% (LM25066IA) over temperature
• Averaging of VIN, IIN, PIN, and VOUT over
programmable interval ranging from 0.001 to 4
seconds
• Programmable WARN and FAULT thresholds
with SMBA notification
• Blackbox capture of telemetry measurements
and device status triggered by WARN or
FAULT condition
• 24-lead WQFN package

APPLICATIONS
• Server backplane systems
• Basestation power distribution systems
• Solid state circuit breaker (eFuse)

DESCRIPTION
While the LM25066I/A is functionally similar to the
LM25066/A, the LM25066I/A is fully compliant to Intel
Node Manager 2.0, 2.5 and adds the READ_EIN
energy accumulator feature. The LM25066I/A
combines a high-performance hot-swap controller
with a PMBus 1.2™ compliant SMBus/I2C interface to
accurately measure, control and protect the electrical
operating conditions of critical systems. The
LM25066I/A continuously supplies real-time power,
voltage, current, temperature, and fault data to the
system management host via the SMBus interface.
The LM25066I/A control block includes a unique hot-
swap architecture that provides current and power
limiting to protect sensitive circuitry even during the
most stressful conditions. A fast-acting circuit breaker
prevents damage in the event of a short circuit on the
output. The input under-voltage, over-voltage hysteresis, insertion delay time and fault detection
time are all configurable. A temperature monitoring
block on the LM25066I/A interfaces with a low-cost
external diode for continuous temperature
assessment of the external MOSFET or other thermal
sensitive components. The POWER GOOD output
provides a fast alert when the input and/or output voltages are outside their programmed range.
Accurate power readings are accomplished by using
the READ_EIN command. A black box
(Telemetry/Fault Snapshot) function captures and
stores telemetry data and device status in the event
of a warning or a fault.