1FEATURES

2• Input Voltage Range: -10V to -80V

• Programmable 26 mV or 50 mV Current Limit

Threshold with Power Limiting (MOSFET

Power Dissipation Limiting)

• Real Time Monitoring of VIN, VOUT, IIN, PIN, VAUX

with 12-Bit Resolution and 1 kHz Sampling

Rate

• Configurable Circuit Breaker Protection for

Hard Shorts

• Configurable Under-Voltage and Over-Voltage

Protection

• Remote Temperature Sensing with

Programmable Warning and Shutdown

Thresholds

• Detection and Notification of Damaged

MOSFET Condition

• Power Measurement Accuracy: ±4.5% Over

Temperature

• True Input Power Averages Dynamic Power

Readings

• 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

• Black Box Capture of Telemetry

Measurements and Device Status Triggered by

WARN or FAULT Condition

• I2C/SMBus Interface and PMBus Compliant

Command Structure

• Full Featured Application Development

Software

• HTSSOP-28 Package

APPLICATIONS

• Base Station Power Distribution Systems

• Intelligent Solid State Circuit Breaker

• -24V/-48V Industrial Systems

DESCRIPTION

The LM5064 combines a high performance hot swap

controller with a PMBusTM compliant SMBus/I2C

interface to accurately measure, protect and control

the electrical operating conditions of systems

connected to a backplane power bus. The LM5064

continuously supplies real-time power, voltage,

current, temperature and fault data to the system

management host via the SMBus interface.

The LM5064 control block includes a unique hot

swap architecture that provides current and power

limiting to protect sensitive circuitry during insertion of

boards into a live system backplane, or any other

hot power source. A fast acting circuit breaker

prevents damage in the event of a short circuit on the output. The input under-voltage and over-voltage

levels and hysteresis are configurable, as well as the

insertion delay time and fault detection time. A

temperature monitoring block on the LM5064

interfaces with a low-cost external diode for

monitoring the temperature of the external MOSFET

or other thermally sensitive components. The PGD

output provides a fast indicator when the input and/or

output voltages are outside their programmed ranges.

The LM5064 monitoring circuit 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/Fault Snapshot)

function captures and stores telemetry data and

device status in the event of a warning or a fault.