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.