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TI brings Industry’s First Multiphase Bidirectional Current Controller

Highly integrated buck-boost controller from Texas Instruments (TI) efficiently transfers power between dual automotive battery systems 

Texas Instruments (TI) unveils fully integrated multiphase bidirectional DC/DC current controller. Claimed as industry-first, the new solution efficiently transfers electric power greater than 500 W per phase between dual 48-V and 12-V automotive battery systems.

Bidirectional DC/DC Current ControllerThe highly integrated LM5170-Q1 analog controller features an innovative average current-mode control method that overcomes the challenges of today’s high-component-count, full digital control schemes.

Hybrid electric vehicles use both a high-voltage 48-V battery and the standard 12-V automotive battery. Design engineers typically manage these dual battery systems using a digital control scheme, which includes multiple discrete components such as current-sense amplifiers, gate drivers and protection circuits. These full digital control schemes are bulky and expensive. To solve this challenge while improving performance and system reliability, TI offers a mixed architecture in which the microcontroller handles higher-level intelligent management, and the highly integrated LM5170-Q1 analog controller provides the power conversion.

Key Features and Benefits Include:

  • Unique design for optimized system cost and performance: The LM5170-Q1’s average current-mode control method improves performance, simplifies implementation and reduces cost. Read the blog post, “Selecting a bidirectional converter control scheme,” to find out how TI’s average current-mode control method compares to conventional control schemes.
  • High accuracy: The controller’s 1 percent accurate bidirectional current regulation ensures precise power transfer.
  • Power efficient: The LM5170-Q1 achieves greater than 97 percent efficiency.
  • High precision: The controller monitors current with up to 99 percent accuracy.
  • High power: Integrated 5-A peak half-bridge gate drivers for high power capability.
  • Superior performance:  Diode emulation mode of the synchronous rectifier MOSFETs prevents negative current and enhances light load efficiency.
  • Automotive quality: The LM5170-Q1 is AEC-Q100 qualified. Download the white paper “Driving the green revolution in transportation,” to learn how advanced electronics are increasing the automation, safety, comfort and convenience of electric vehicles.

Availability, Packaging and Pricing

Available in volume now through the TI store and authorized distributors, the LM5170-Q1 is offered in a 48-pin, 9-mm by 9-mm quad flat package (QFP) and priced at US$5.84 in 1,000-unit quantities. Order the LM5170EVM-BIDIR evaluation module, and download the PSpice transient model and LM5170-Q1 quick-start DC/DC synchronous buck converter design tool.

TI at Applied Power Electronics

Texas Instruments (TI) will demonstrate the LM5170-Q1 controller in booth No. 701 at the Applied Power Electronics Conference (APEC) in Tampa, Florida, March 27-29, 2017. The LM5170-Q1 is the latest in TI’s portfolio of industry-leading DC/DC converters, controllers and charge pumps, enabling engineers to innovate and differentiate their power supply designs.

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