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.