Product
0
LM5171-Q1
  • LM5171-Q1
  • LM5171-Q1
  • LM5171-Q1
  • LM5171-Q1

LM5171-Q1

ACTIVE

Automotive, 80-V dual-channel bidirectional buck-boost controller

Texas Instruments LM5171-Q1 Product Info

1 April 2026 0

Parameters

Rating

Automotive

Topology

Boost, Buck, Buck/Boost

Vin (max) (V)

75

Vin (min) (V)

1

Vout (max) (V)

80

Vout (min) (V)

3

Control mode

current mode

Features

Adjustable current limit, Bidirectional, Enable, Frequency synchronization, Multiple outputs, Phase interleaving, Synchronous rectification, UVLO adjustable

Iq (typ) (A)

0.001

TI functional safety category

Functional Safety-Capable

Operating temperature range (°C)

-40 to 150

Package

HTQFP (PHP)-48-81 mm² 9 x 9

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
  • 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
  • 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
  • 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

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.

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.

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