Texas Instruments has introduced a fully integrated multiphase bidirectional DC/DC current controller, which transfers electric power greater than 500W per phase between dual 48V and 12V automotive battery systems.

Hybrid electric vehicles use both a high-voltage 48V battery and the standard 12V 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. However, these full digital control schemes are bulky and expensive. TI offers a mixed architecture in which the microcontroller handles higher-level intelligent management, while its LM5170-Q1 analog controller provides the power conversion.

The LM5170-Q1's average current-mode control method improves performance, simplifies implementation and reduces cost, while its 1% accurate bidirectional current regulation ensures precise power transfer, according to TI.

The AEC-Q100 qualified LM5170-Q1 features integrated 5A peak half-bridge gate drivers for high power capability, while its diode emulation mode of the synchronous rectifier MOSFETs prevents negative current and enhances light load efficiency.

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