Industry's first 100-V synchronous buck regulator with integrated MOSFETs improves reliability in high-voltage applications

January 26, 2012 // By Paul Buckley
Texas Instruments Incorporated has expanded the company’s high-voltage point-of-load product line by introducing what the company claims is the industry’s first 100-V synchronous buck regulator with integrated MOSFETs. The 600-mA LM5017 is the first in a new family of step-down switching regulators that reduce PCB area and system cost while improving high-voltage reliability in telecommunication, industrial, smart grid and automotive systems.

Used in conjunction with the award-winning WEBENCH online design tool, the LM5017 simplifies high-voltage DC/DC conversion and speeds the design process.

The 600-mA LM5017 , together with the 300-mA LM5018 and 100-mA LM5019 available in April 2012, enables direct point-of-load voltage regulation from input voltages as high as 100-V. This eliminates external transient voltage suppressors or clamps required to achieve reliable operation in high-voltage applications.

Integrated MOSFETs eliminate freewheeling Schottky diodes and improve efficiency. Pin-compatible 4-mm by 4-mm LLP packaging offers a scalable solution that covers a wide range of power requirements. Constant on-time (COT) control architecture provides excellent load transient response with no loop compensation required, further reducing the PCB area and simplifying the power supply design process.

The new switching regulators can also be used as isolated bias supplies for systems requiring small, efficient isolated power supplies. Unlike alternative flyback solutions, the LM5017 operates at switching frequencies up to 1-MHz, dramatically reducing the size and cost of the transformer.

For applications that require fixed frequency operation, TI’s 100-V UCC25230 isolated bias supply switching converter supports up to 200-mA output current and uses a voltage mode control topology with input feed forward.
Availability and Pricing

The LM5017 is available in volume now from TI and its authorized distributors. The LM5018 and LM5019 will be available in April. Offered in a thermally-enhanced 8-pin LLP package measuring 4-mm by 4-mm, the suggested retail price of the LM5017 is $1.65, the LM5018 is $1.40 and the LM5019 is $1.25 in 1,000-unit quantities. The LM5017 in an 8-pin PSOP package will be available in March 2012.
More information about the LM5017 100-V synchronous buck regulator

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