1 Features
• AEC-Q100 qualified for automotive applications:
– Device temperature grade 1: –40°C to +125°C
ambient operating range
– Device HBM ESD classification level 2
– Device CDM ESD classification level C4B
• Functional Safety-Capable
– Documentation available to aid functional safety
system design
• 85V HV-port and 80V LV-port max ratings
• 1% typical accuracy of bidirectional current
regulation
• 1% typical accuracy of channel current monitoring
• I2C interface for monitoring and diagnosis
• Built-in 3.5V 1% reference voltage
• Integrated 5V 10mA bias supply
• 5A peak half-bridge gate drivers
• Programmable or adaptive dead-time control
• Programmable oscillator frequency up to 1MHz
with optional synchronization to external clock
• Independent channel enabling control inputs
• Integrated both current and voltage loop control
• Programmable cycle-by-cycle peak current limit
• Over-temperature shutdown
• HV and LV port overvoltage protection
• Dynamically selectable diode emulation and forced
PWM operation modes
• Programmable soft-start timer
• Supports both multiphase and independent
channel operations
• Supports urgent shutdown latch

2 Applications
• Automotive dual-battery systems
• Super-cap or battery backup power converter
• Stackable high-power buck or boost applications

3 Description
The LM5171-Q1 controller provides the high voltage
and precision elements of a dual-channel bidirectional
converter, examples include dual battery systems.
The LM5171-Q1 supports multiphase parallel
operation with balanced current sharing in each
phase. The LM5171-Q1 also supports independent
channel bi-directional operation making it versatile as
standalone controller operating as multiphase buck/
boost or independent buck or boost.
The dual-channel differential current sense amplifiers
and dedicated channel current monitors achieve a
typical accuracy of 1%. The robust 5A half-bridge
gate drivers are capable of driving parallel MOSFETs
for more power per channel. Program the controller
dynamically to operate in either diode emulation
mode (DEM) or forced PWM (FPWM) mode. Versatile
protection features include cycle-by-cycle current
limiting, overvoltage protection, overtemperature
protection and urgent shutdown latch.