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LM5171

ACTIVE

80-V dual-channel bidirectional buck-boost controller

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Data sheet

LM5171

ACTIVE
Data sheet Order now

Product details

Rating Catalog Topology Boost, Buck, Buck/Boost Vin (max) (V) 75 Vin (min) (V) 1 Vout (max) (V) 80 Vout (min) (V) 3 Features 1-MHz maximum frequency, Adjustable current limit, Adjustable soft start, Adjustable switching frequency, Bidirectional, Enable, Frequency synchronization, Light-load efficiency, Multiple outputs, Phase interleaving, Power good, Synchronous rectification, UVLO adjustable Operating temperature range (°C) -40 to 150 Iq (typ) (µA) 1000 Duty cycle (max) (%) 99 TI functional safety category Functional Safety-Capable
Rating Catalog Topology Boost, Buck, Buck/Boost Vin (max) (V) 75 Vin (min) (V) 1 Vout (max) (V) 80 Vout (min) (V) 3 Features 1-MHz maximum frequency, Adjustable current limit, Adjustable soft start, Adjustable switching frequency, Bidirectional, Enable, Frequency synchronization, Light-load efficiency, Multiple outputs, Phase interleaving, Power good, Synchronous rectification, UVLO adjustable Operating temperature range (°C) -40 to 150 Iq (typ) (µA) 1000 Duty cycle (max) (%) 99 TI functional safety category Functional Safety-Capable
HTQFP (PHP) 48 81 mm² 9 x 9
  • 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
  • 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

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-by-cycle current limiting, overvoltage protection at both HV and LV ports, and overtemperature protection and urgent shutdown latch.

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-by-cycle current limiting, overvoltage protection at both HV and LV ports, and overtemperature protection and urgent shutdown latch.
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Technical documentation

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Type Title Date
* Data sheet LM5171 Dual Channel Bidirectional Controller datasheet PDF | HTML 16 Jun 2024
Application note How to Use the Two Channels of LM5171 Independently PDF | HTML 30 Oct 2025
Application note U-140 Average Current Mode Control of Switching Power Supplies 05 Sep 1999

Design & development

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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
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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
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