LM5064 Datasheet, PDF (1/51 Pages) Texas Instruments – Negative Voltage System Power Management and Protection IC with PMBus

LM5064
October 22, 2011
Negative Voltage System Power Management and
Protection IC with PMBus
General Description
The LM5064 combines a high performance hot swap con-
troller with a PMBus^TM compliant SMBus/I²C interface to ac-
curately 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 circuit computes both the real-time
and average values of subsystem operating parameters
(V_IN, I_IN, P_IN, V_OUT) 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 Snap-
shot) function captures and stores telemetry data and device
status in the event of a warning or a fault.
Features
■ ^{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}_IN^{, V}_OUT^{, I}_IN^{, P}_IN^{, V}_AUX ^{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 V}_IN^{, I}_IN^{, P}_IN^{, and V}_OUT ^{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}
■ ^{eTSSOP-28 package}
Applications
■ ^{Base Station Power Distribution Systems}
■ ^{Intelligent Solid State Circuit Breaker}
■ ^{-24V/-48V Industrial Systems}
Typical Application Circuit
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