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LM5171-Q1

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

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Data sheet

LM5171-Q1

ACTIVE
Data sheet Order now

Product details

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 Operating temperature range (°C) -40 to 150 Iq (typ) (µA) 1000 TI functional safety category Functional Safety-Capable
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 Operating temperature range (°C) -40 to 150 Iq (typ) (µA) 1000 TI functional safety category Functional Safety-Capable
HTQFP (PHP) 48 81 mm² 9 x 9
  • 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

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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Technical documentation

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Type Title Date
* Data sheet LM5171-Q1 Dual Channel Bidirectional Controller datasheet (Rev. B) PDF | HTML 29 Sep 2025
Application note How to Use the Two Channels of LM5171 Independently PDF | HTML 30 Oct 2025
Functional safety information LM5171-Q1 Functional Safety FIT, FMD, and Pin FMA (Rev. A) PDF | HTML 06 Oct 2023
Certificate LM5171EVM-BIDIR EU Declaration of Conformity (DoC) 05 May 2023
Application note U-140 Average Current Mode Control of Switching Power Supplies 05 Sep 1999

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

LM5171EVM-BIDIR — LM5171 evaluation module

The LM5171EVM-BIDIR evaluation module (EVM) is a dual-phase interleaved bidirectional converter ideal for 48V to 12V dual battery system applications. It is multiphase stackable with adjustable interleaving angle and balanced current sharing. The EVM also includes various jumpers to configure the (...)
User guide: PDF | HTML
Not available on TI.com
Calculation tool

LM5171-CALC — LM5171-Q1 Quickstart Calculator

LM5171-Q1 Quickstart Calculator helps on design of the power stage, current loop and voltage loop. Component calculations for the controller are also included.
Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC controllers (external FET)
  • LM5171 — 80-V dual-channel bidirectional buck-boost controller
  • LM5171-Q1 — Automotive, 80-V dual-channel bidirectional buck-boost controller
Hardware development
Evaluation board
Download
Reference designs

PMP41079 — Two-phase interleaved boost converter  reference design for Class-H audio amplifiers

This reference design demonstrates a 450-W, 2-phase interleaved boost converter reference design for the Class-H audio amplifier application. To provide supply to the external audio amplifier, the controller is able to follow the Class-H control signal from the amplifier and generate an output (...)
Test report: PDF
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HTQFP (PHP) 48 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

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