1 Features
• 5.5V to 90V operation
– 100V Continuous absolute max
– Withstand up to -5V at output
• Adjustable ILIM thresholds from 10mV to 50mV
• Programmable FET SOA protection
• Programmable overcurrent blanking with digital
timer
• Strong gate pull down (1.5A) for fast turn OFF
• Robust short circuit protection
– Fast trip response (360ns)
– Immune to supply line transients
• LM5066H2 with advanced features
– Dual gate drive for high power applications
– SYNC pin for parallel controller operation
– Soft start capacitor disconnect
• Failed FET detection
• Programable UV, OV, tFAULT thresholds
• External FET temperature sensing
• Failed FET detection
• I2C / SMBus interface
• PMBus® interface for telemetry, control,
configuration and debug
– On chip EEPROM nonvolatile memory for
configuration
– Precision VIN, VOUT, IIN, PIN, VAUX monitoring V
(<±1%); I (<±1%); P (<±1.75%)
– Power cycle with a single command
– Blackbox fault recording of multiple events with
relative time stamp stored in internal EEPROM
• 12-bit ADC with 250kHz sampling rate
• Supports energy monitoring via Read_EIN
command
• External FET temperature sensing
• –40°C < TJ < 125°C operation

2 Applications
• 12V and 48V servers and datacenter
• Base station power distribution
• Networking routers and switchers
• PLC power management
• 24V to 48V industrial systems

3 Description
The LM5066Hx provides robust protection and
precision monitoring for 12V, 24V and 48V systems
with programmable UV, OV, ILIM, and fast short circuit
protection for customized input power applications.
Programmable power limit threshold along with
adjustable fault timer (tFAULT) limits maximum power
dissipation and ensures FET SOA protection under
all conditions including startup and fault events. Two
level over current blanking with digital timers allows
higher load transients to pass, enabling lower current
limit settings and reducing requirements for strong
SOA MOSFETs.
An integrated PMBus™interface enables remote
monitoring, control, and configuration of the system
in real time. Key parameters can be accessed
remotely for telemetry, and various thresholds can
be configured through PMBus or stored in internal
non volatile memory. The fast, accurate analog
load current monitor supports predictive maintenance
and dynamic power management including Intel
PSYS and PROCHOT functionality to optimize server
performance. A blackbox fault recording feature helps
in debugging field failures.
The LM5066H2 features dual gate drive architecture
which enables use of a single strong SOA FET
to handle power stress during startup and fault
conditions, combined with multiple small low RDS(ON)
FETs for normal load current operation, reducing the
total solution size.