As a family of highly integrated pin-compatible ICs,
Reduction in PCB area and improvement in reliability for high-voltage applications

TI Korea (CEO Kent Jeon, www.ti.com/ww/kr ) February 2, 2012 – TI announced the release of a new family of 100V synchronous buck regulators featuring the industry's first integrated MOSFET, adding to its existing high-voltage point-of-load (POL) product line. The LM5017 is the first product in a new family of 600mA step-down switching regulators. Suitable for applications in telecommunications, industrial, smart grid, and automotive systems, it improves high-voltage reliability while saving PCB area and system costs. The LM5017 simplifies high-voltage DC/DC conversion and accelerates design work using the WEBENCH® online design tool. (For more information, samples, and evaluation boards, see www.ti.com/lm5017-prkr )

TI plans to showcase the LM5017 product at booth #401 at the Applied Power Electronics Conference and Expo (APEC), held in Orlando, Florida, from February 6 to 8. APEC is one of the industry's major exhibitions, attended by power semiconductor experts.

The 600mA LM5017, the 300mA LM5018 (scheduled for release in April), and the 100mA LM5019 enable direct point-of-load (POL) voltage regulation with input voltages up to 100V. Therefore, they do not require external transient voltage suppressors or clamp functions required to achieve reliable operation in high-voltage applications. Furthermore, by integrating MOSFETs, freewheeling Schottky diodes can be eliminated, improving efficiency. Additionally, the use of pin-compatible 4mm x 4mm LLP packaging allows for the selection of products that meet specific power requirements. Moreover, the constant on-time (COT) control architecture provides excellent load transient response performance without loop compensation, further reducing PCB area and simplifying power supply design. (Refer to www.ti.com/lm5017-prv for related video)

This new switching regulator can also be used as an isolated bias power supply for systems requiring a compact and efficient isolated power supply. Unlike other flyback solutions, the LM5017 operates at switching frequencies up to 1 MHz, which can significantly reduce the size and cost of the transformer. (For the lab demo video, please refer to www.ti.com/lm5017-prvdemo )

TI's 100V UCC25230 isolated bias power supply switching converter provides up to 200mA of output current for applications requiring fixed frequency operation and uses a voltage mode control topology featuring feedforward functionality.

Key Features and Advantages of Synchronous Buck Regulators
• Provides enhanced system reliability in various design types with a wide input voltage range of 9V to 100V
• The 600mA LM5017, 300mA LM5018, and 100mA LM5019 are pin-compatible products available for both non-isolated step-down and isolated power supply applications.
• By utilizing the COT control architecture, rapid transient response performance is provided, and since loop correction is not required, cost reduction and design simplification are possible.
• Improves efficiency by integrating high-side and low-side N-channel MOSFETs and eliminates the need for external Schottky diodes
• By integrating a high-voltage operating regulator, it is possible to provide bias power for the IC's internal operation and the integrated gate driver.
• Peak current limiting and overheating detection functions prevent device overload, and voltage threshold and history functions can be independently programmed.