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03-22-2017

Industry's first multiphase bidirectional current controller from TI

Texas Instruments » LM5170-Q1

Highly integrated buck-boost controller efficiently transfers power between dual automotive battery systems

Texas Instruments (TI) introduced the industry's first fully integrated multiphase bidirectional DC/DC current controller, which efficiently transfers electric power greater than 500 W per phase between dual 48-V and 12-V automotive battery systems. The 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.

Texas Instruments - LM5170-Q1

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.

LM5170EVM-BIDIR: LM5170 48 V-12 V Bidirectional Converter Evaluation Module
LM5170EVM-BIDIR: LM5170 48 V-12 V Bidirectional Converter
Evaluation Module.

LM5170-Q1 key features and benefits

  • Unique design for optimized system cost and performance:
    The LM5170-Q1's average current-mode control method improves performance, simplifies implementation and reduces cost.
     
  • 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.

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.

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