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.
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.
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| 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.
