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LM5170

ACTIVE

Multiphase bidirectional current controller

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Data sheet

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LM5171 ACTIVE 80-V dual-channel bidirectional buck-boost controller Higher Vin range, Higher drive strength

LM5170

ACTIVE
Data sheet Order now

Product details

Rating Catalog Topology Boost, Buck, Buck/Boost Vin (max) (V) 85 Vin (min) (V) 3 Vout (max) (V) 85 Vout (min) (V) 6 Features Adjustable current limit, Bidirectional, Enable, Frequency synchronization, Light-load efficiency, Load Disconnect, Multiple outputs, Phase interleaving, Power good, Synchronous rectification, UVLO adjustable Duty cycle (max) (%) 99 Iq (typ) (A) 0.001 TI functional safety category Functional Safety-Capable Operating temperature range (°C) -40 to 125
Rating Catalog Topology Boost, Buck, Buck/Boost Vin (max) (V) 85 Vin (min) (V) 3 Vout (max) (V) 85 Vout (min) (V) 6 Features Adjustable current limit, Bidirectional, Enable, Frequency synchronization, Light-load efficiency, Load Disconnect, Multiple outputs, Phase interleaving, Power good, Synchronous rectification, UVLO adjustable Duty cycle (max) (%) 99 Iq (typ) (A) 0.001 TI functional safety category Functional Safety-Capable Operating temperature range (°C) -40 to 125
HTQFP (PHP) 48 81 mm² 9 x 9
  • Functional Safety-Capable
  • Suited for high power industrial dual battery system
    • 100-V HV-port and 65-V LV-port max ratings
    • 1% Accurate bidirectional current regulation
    • 1% Accurate channel current monitoring
    • 5-A Peak half-bridge gate drivers
    • Support multi-phase operation with stackability
    • Diode emulation prevents negative current
  • Programmability and flexibility
    • Programmable or adaptive dead-time control
    • Programmable oscillator frequency with optional synchronization to external clock
    • Dual channel enable control inputs
    • Analog and PWM current controls
    • Programmable peak current limit
    • Programmable soft-start timer
    • Phase adding or dropping using EN2
  • Integrated protection features
    • HV and LV port over-voltage protection
    • MOSFET failure detect at start-up and circuit breaker control
    • Thermal shutdown
  • Functional Safety-Capable
  • Suited for high power industrial dual battery system
    • 100-V HV-port and 65-V LV-port max ratings
    • 1% Accurate bidirectional current regulation
    • 1% Accurate channel current monitoring
    • 5-A Peak half-bridge gate drivers
    • Support multi-phase operation with stackability
    • Diode emulation prevents negative current
  • Programmability and flexibility
    • Programmable or adaptive dead-time control
    • Programmable oscillator frequency with optional synchronization to external clock
    • Dual channel enable control inputs
    • Analog and PWM current controls
    • Programmable peak current limit
    • Programmable soft-start timer
    • Phase adding or dropping using EN2
  • Integrated protection features
    • HV and LV port over-voltage protection
    • MOSFET failure detect at start-up and circuit breaker control
    • Thermal shutdown

The LM5170 controller provides the essential high voltage and precision elements of a dual-channel bidirectional converter. It regulates the average current flowing between the high voltage and low voltage ports in the direction designated by the DIR input signal. The current regulation level is programmed through analog or digital PWM inputs.

Dual-channel differential current sense amplifiers and dedicated channel current monitors achieve typical current accuracy of 1%. Robust 5-A half-bridge gate drivers are capable of driving parallel MOSFET switches delivering 500 W or more per channel. The diode emulation mode of the synchronous rectifiers prevents negative currents but also enables discontinuous mode operation for improved efficiency with light loads. Versatile protection features include cycle-by-cycle current limiting, overvoltage protection at both HV and LV ports, MOSFET failure detection, and overtemperature protection.

The LM5170 controller provides the essential high voltage and precision elements of a dual-channel bidirectional converter. It regulates the average current flowing between the high voltage and low voltage ports in the direction designated by the DIR input signal. The current regulation level is programmed through analog or digital PWM inputs.

Dual-channel differential current sense amplifiers and dedicated channel current monitors achieve typical current accuracy of 1%. Robust 5-A half-bridge gate drivers are capable of driving parallel MOSFET switches delivering 500 W or more per channel. The diode emulation mode of the synchronous rectifiers prevents negative currents but also enables discontinuous mode operation for improved efficiency with light loads. Versatile protection features include cycle-by-cycle current limiting, overvoltage protection at both HV and LV ports, MOSFET failure detection, and overtemperature protection.
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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet LM5170 Multiphase Bidirectional Current Controller datasheet (Rev. B) PDF | HTML 11 Aug 2021
White paper 設計準確且多功能的鋰離子 電池測試解決方案 10 Nov 2020
White paper Designing an Accurate, Multifunction Lithium-Ion Battery-Testing Solution 24 Sep 2020
Functional safety information LM5170 and LM5170-Q1 Functional Safety, FIT Rate, and Failure Mode Distribution 22 May 2020
Technical article Achieving highly accurate full-scale charge and discharge current control for high PDF | HTML 13 Aug 2018
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

LM5170EVM-BIDIR — LM5170 48V-12V Bidirectional Converter Evaluation Module

The LM5170EVM-BIDIR is a high performance dual phase bi-directional converter ideal for 48V-12V dual battery system applications.  The two phases operate in 180degree interleaved operation, and they evenly share a max dc current of up to 60A.  When DIR is set to "1" the power flows from (...)
User guide: PDF | HTML
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Simulation model

LM5170 PSpice Transient Model (Rev. A)

SNVMB14A.ZIP (154 KB) - PSpice Model
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Simulation model

LM5170 TINA-TI Reference Design

SNVMB67.TSC (592 KB) - TINA-TI Reference Design
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Simulation model

LM5710 TINA-TI Transient Spice Model

SNVMB68.ZIP (132 KB) - TINA-TI Spice Model
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