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Buck-boost & inverting controllers (external switch)

LM5170-Q1

ACTIVE

Multiphase bidirectional current controller, AEC-Q100 qualified

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Data sheet

LM5170-Q1

ACTIVE
Data sheet Order now

Product details

Topology Boost, Buck Vin (Min) (V) 3 Vin (Max) (V) 85 Vout (Max) (V) 85 Vout (Min) (V) 6 Duty cycle (Max) (%) 99 Switching frequency (Min) (kHz) 50 Switching frequency (Max) (kHz) 500 Iq (Typ) (mA) 1 Features Adjustable Current Limit, Adjustable UVLO, Enable, Frequency Synchronization, Light Load Efficiency, Load Disconnect, Multiple Outputs, Phase Interleaving, Power Good, Synchronous Rectification, UVLO Adjustable Iout (Max) (A) 50 Operating temperature range (C) -40 to 150 Rating Automotive
Topology Boost, Buck Vin (Min) (V) 3 Vin (Max) (V) 85 Vout (Max) (V) 85 Vout (Min) (V) 6 Duty cycle (Max) (%) 99 Switching frequency (Min) (kHz) 50 Switching frequency (Max) (kHz) 500 Iq (Typ) (mA) 1 Features Adjustable Current Limit, Adjustable UVLO, Enable, Frequency Synchronization, Light Load Efficiency, Load Disconnect, Multiple Outputs, Phase Interleaving, Power Good, Synchronous Rectification, UVLO Adjustable Iout (Max) (A) 50 Operating temperature range (C) -40 to 150 Rating Automotive
HTQFP (PHP) 48 49 mm² 7 x 7
  • 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
  • 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
  • Programmable or adaptive dead-time control
  • Programmable oscillator frequency with optional synchronization to external clock
  • Independent channel enable control inputs
  • Analog and digital channel current control inputs
  • Programmable cycle-by-cycle peak current limit
  • HV and LV port overvoltage protection
  • Diode emulation prevents negative current
  • Programmable soft-start timer
  • MOSFET failure detect at start-up and circuit breaker control
  • Multiphase operation phase adding or dropping
  • 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
  • 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
  • Programmable or adaptive dead-time control
  • Programmable oscillator frequency with optional synchronization to external clock
  • Independent channel enable control inputs
  • Analog and digital channel current control inputs
  • Programmable cycle-by-cycle peak current limit
  • HV and LV port overvoltage protection
  • Diode emulation prevents negative current
  • Programmable soft-start timer
  • MOSFET failure detect at start-up and circuit breaker control
  • Multiphase operation phase adding or dropping

The LM5170-Q1 controller provides the essential high voltage and precision elements of a dual-channel bidirectional converter for automotive 48-V and 12-V dual battery systems. 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-Q1 controller provides the essential high voltage and precision elements of a dual-channel bidirectional converter for automotive 48-V and 12-V dual battery systems. 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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Type Title Date
* Data sheet LM5170-Q1 Multiphase Bidirectional Current Controller datasheet (Rev. D) PDF | HTML 13 Aug 2021
Application note Buck Converter Design with LM5170-Q1 to Equalize Two-Serial 12V Batteries PDF | HTML 15 Dec 2021
Functional safety information LM5170 and LM5170-Q1 Functional Safety, FIT Rate, and Failure Mode Distribution 22 May 2020
Analog Design Journal Why use PSR‐flyback isolated converters in dual‐battery mHEV systems 19 Mar 2020
Technical article Taking a modular approach to high-precision, high-current battery test equipment 21 Jun 2019
White paper Bridging 12 V and 48 V in dual-battery automotive systems 18 Oct 2018
Technical article Achieving highly accurate full-scale charge and discharge current control for high-cell Li-ion battery-formation testing 13 Aug 2018
Technical article How to charge and discharge battery test equipment 12 Apr 2018
Technical article TI empowers design engineers at APEC 16 Feb 2018
EVM User's guide LM5170-Q1 EVM User's Guide (Rev. A) PDF | HTML 05 Dec 2016

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 (...)
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Simulation model

LM5170 PSpice Transient Model (Rev. A) LM5170 PSpice Transient Model (Rev. A)

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Simulation model

LM5170 TINA-TI Reference Design LM5170 TINA-TI Reference Design

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Simulation model

LM5710 TINA-TI Transient Spice Model LM5710 TINA-TI Transient Spice Model

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Simulation tool

PSPICE-FOR-TI PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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Calculation tool

LM5170-Q1 Design Calculator LM5170-Q1 Design Calculator

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Reference designs

TIDA-01168 — Bidirectional DC/DC Converter Reference Design for 12-V/48-V Automotive Systems

The TIDA-01168 reference design is a four-phase, bidirectional DC-DC converter development platform for 12-V/48-V automotive systems. The system uses two LM5170-Q1 current controllers and a TMS320F28027F microcontroller (MCU) for the power stage control. LM5170-Q1 subsystems use average current (...)
document-pdfAcrobat Schematic
Reference designs

PMP22396 — 2460-W bidirectional boost converter reference design for automotive applications

This reference design is a 2460-W bidirectional boost converter for automotive applications. The circuit is powered from the nominal 12-V battery to provide an output voltage of 48 V at 51.25 A. The design uses two dual-phase synchronous bidirectional controllers operating at a switching frequency (...)
document-pdfAcrobat Schematic
Reference designs

PMP21943 — 48-V / 25-A negative-to-positive synchronous buck-boost reference design for power amplifiers

This reference design is a negative-to-positive synchronous buck-boost converter for power amplifier applications. The circuit is powered from the nominal -48-V system source to provide an output voltage of +48 V at 25 A. The design uses two dual synchronous boost controllers for 4-phase operation (...)
document-pdfAcrobat Schematic
Reference designs

PMP21867 — 12-V / 100-A negative-to-positive synchronous buck-boost reference design for power amplifiers

This reference design is a negative-to-positive synchronous buck-boost converter for power amplifier applications. The circuit is powered from the nominal -48-V system source to provide an output voltage of +12 V at 100 A. The design uses two dual synchronous boost controllers for 4-phase (...)
document-pdfAcrobat Schematic
Reference designs

TIDA-01040 — Battery Tester Reference Design for High Current Applications

Li-Ion battery formation and electrical testing require accurate voltage and current control, usually to better than ±0.05% over the specified temperature range.  This reference design proposes a solution for high-current (up to 50 A) battery tester applications supporting input (bus) (...)
document-pdfAcrobat Schematic
Reference designs

TIDA-01041 — Battery tester reference design for multi-phase high-precision 0.5 to 100 A battery formation

This reference design provides a multi-phase solution for a wide range of current battery test applications. Leveraging the dual phase buck/boost controller LM5170's daisy chain configuration gives the design the ability to achieve 100A charging/discharging rates. Utilizing high accuracy constant (...)
document-pdfAcrobat Schematic
Reference designs

TIDA-01042 — Modular battery tester reference design for 50-A, 100-A, and 200-A applications

This reference design provides a modular battery test solution allowing users to have the flexibility to test batteries at different current levels with one design. This design leverages the TIDA-01041 reference design by providing two 100-A battery testers that can work independently or be (...)
document-pdfAcrobat Schematic
Reference designs

PMP15035 — 1000-W, Bidirectional, 12-V to 12-V Converter Reference Design

This reference design is a dual-channel, bidirectional converter suitable for 12-V to 12-V, dual-battery system, automotive applications. This reference design has a wide input range (3 V to 40 V) and could give full load (1kW) in the input voltage from 9V to 18V by using two LM5170-Q1 (...)
document-pdfAcrobat Schematic
Reference designs

PMP15038 — 50A, 0.05% Current Accuracy Power Reference Design for Battery Test Systems

This reference design introduces a large current, highly accurate and bi-directional power solution used in battery test systems (BTS). It includes a LM5170EVM-BIDIR and a signal control board. The LM5170EVM-BIDIR is an evaluation board  to showcase the high performance of the dual-channel (...)
document-pdfAcrobat Schematic
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