1 Features
• Functional Safety-Capable
• 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
• Support both multiphase and independent channel
operations
• Support urgent shutdown latch

2 Applications
• Battery Testing System (BTS)
• Super-cap or battery backup power converter
• Stackable high-power buck or boost applications

3 Description
The LM5171 controller provides the high voltage and
precision elements of a dual-channel bidirectional
converter. Examples include dual battery systems.
The LM5171 supports multiphase parallel operation
with balanced current sharing in each phase.
The LM5171 also supports independent channel
bi-directional operations 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
typical accuracy of 1%. The robust 5A half-bridge gate
drivers are capable of driving parallel MOSFETs for
scaling more power per channel. The controller can
be dynamically programmed to operate in either the
diode emulation mode (DEM) or forced PWM (FPWM)
mode. Versatile protection features include cycle-bycycle
current limiting, overvoltage protection at both
HV and LV ports, and overtemperature protection and
urgent shutdown latch.