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Date: 10/04/2017

TI unveils integrated buck-boost DC/DC current controller

Texas Instruments (TI) has revealed an integrated multiphase bidirectional DC/DC current controller, LM5170-Q1. The new product transfers electric power greater than 500 W per phase between dual 48-V and 12-V automotive battery systems.

Hybrid electric vehicles use both a high-voltage 48-V battery and the standard 12-V automotive battery. Managing these dual battery systems using digital control schemes are said to be bulkier and expensive. TI is offering a mixed architecture in which the microcontroller handles higher-level intelligent management while the LM5170-Q1 analog controller provides power conversion. The integrated controller features an innovative average current-mode control method.

LM5170-Q1 features and benefits, according to TI:

The LM5170-Q1's average current-mode control method improves performance, simplifies implementation and reduces cost. Others include:

Accuracy: The controller's 1 percent accurate bidirectional current regulation ensures precise power transfer

Efficiency: Achieves >97% power efficiency

Precise: Monitors current with up to 99% accuracy

Power: Integrated 5-A peak half-bridge gate drivers for high power capability

Performance: Diode emulation mode of the synchronous rectifier MOSFETs prevents negative current and enhances light load efficiency

Automotive quality: Is AEC-Q100 qualified.


LM5170-Q1 is offered in a 9 X 9 mm, 48-pin, quad flat package (QFP) and is priced at US$5.84 in 1,000-unit quantities. Available in volume now.

The LM5170EVM-BIDIR evaluation module can be ordered and the PSpice transient model and LM5170-Q1 quick-start DC/DC synchronous buck converter design tool can be downloaded.