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

? 85-V HV-port and 80-V 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

? 5-A 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

? Automotive, Industrial dual-battery systems

? Battery Testing System (BTS)

? Super-cap or battery backup power converter

? Stackable high-power buck or boost applications

3 Description

The LM5171-Q1 controller provides the essential high

voltage and precision elements of a dual-channel

bidirectional converter for example is automotive 48-V

and 12-V dual battery systems. It supports multiphase

parallel operation with balanced current sharing in

each phase, and it can also support 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 5-A 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-by-cycle current limiting, overvoltage protection

at both HV and LV ports, and overtemperature

protection and urgent shutdown latch.