Automotive synchronous boost controller offers high output voltage

March 18, 2013 // By Christoph Hammerschmidt
Texas Instruments introduced an automotive-grade, multi-phase synchronous boost controller with high efficiency and high power density. The LM5122Q features the industry’s widest input and output voltage range and is qualified according to the automotive standard AEC-Q100.

TI's new synchronous boost controller increase efficiency by up to 10-percent over non-synchronous boost controllers by replacing the freewheeling diode with a synchronous switch. Lossless inductor DCR current sensing further improves efficiency and reduces heat dissipation to save board space and lower bill of materials cost. It features thermal shutdown, frequency synchronization, hiccup-mode current limit and an adjustable line under-voltage lockout.

The LM5122Q offers a particularly wide input voltage range - from 3 V to 65 V input and up to 100-V output. The controller can be configured for interleaved multi-phase operation, which is required for high power applications like start-stop voltage stabilizers and high power audio amplifiers. A powerful 3-A gate drive circuit supports voltages up to 16-V, enabling flexibility to tune the step-up DC/DC for efficiency and size.

Along with the LM5122Q, Texas Instruments also introduces the TPS43060 and TPS43061. They are low quiescent-current synchronous boost controllers with an input voltage range from 4.5 V to 38 V and an output voltage range of up to 60 V. The TPS43060 provides a 7.5-V gate drive, which drives a broad range of low-cost MOSFETs. The TPS43061 provides a 5.5-V gate drive, optimized for low Qg MOSFETs, such as TI’s CSD86330Q3D synchronous buck NexFET Power Block, which saves up to 50-mm2 of board area. Applications include tablet and notebook USB charging adapters, and industrial test and measurement equipment.

The synchronous boost controllers join TI’s family of step-up power products that include the TPS55340, a 40-V boost converter with an integrated 60-milliohm MOSFET.

For more information on all of TI’s DC/DC switching regulators, visit