© 2011 National Semiconductor Corporation
Negative High Voltage System Power Management and
Protection IC with PMBus
General Description
The LM5064 combines a high performance hot swap con-
troller with a PMBus compliant SMBus/I
rately 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 manage-
ment host via the SMBus interface.
The LM5064 control block includes a unique hot swap archi-
tecture 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 cir-
cuit breaker prevents damage in the event of a short circuit
on the output. The input under-voltage and over-voltage lev-
els 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 pro-
vides a fast indicator when the input and/or output voltages
are outside their programmed ranges.
The LM5064 monitoring block computes both the real-time
and average values of subsystem operating parameters
(V
averaging is accomplished by averaging the product of the
input voltage and current. A black box (Telemetry/Fault Snap-
shot) function captures and stores telemetry data and device
status in the event of a warning or a fault.
Simplified Application Circuit
IN
, I
IN
, P
IN
, V
OUT
) as well as the peak power. Accurate power
2
C interface to accu-
301584
LM5064
Features
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Applications
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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 V
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
True Input Power averages dynamic power readings
Averaging of V
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
I
structure
Full featured application development software
eTSSOP-28 package
Base Station Power Distribution Systems
Intelligent Solid State Circuit Breaker
-24V/-48V Industrial Systems
2
C/SMBus interface and PMBus compliant command
IN
, I
IN
, P
IN
, and V
IN
, V
OUT
OUT
, I
IN
PRELIMINARY
over programmable
, P
IN
, V
301584001
June 21, 2011
AUX
www.national.com
with 12-bit