Toshiba Adds Low On-State-Resistance MOSFETs for Secondary Stage of Switched Mode Power Supplies

Toshiba Adds Low On-State-Resistance MOSFETs for Secondary Stage of Switched Mode Power Supplies

75V and 100V MOSFETs Optimized for Use in SMPS to Reduce Power Loss and Increase Efficiency

IRVINE, Calif., March 25, 2009 — Toshiba America Electronic Components, Inc. (TAEC)*, a committed leader that collaborates with technology companies to create breakthrough designs, today introduced a new series of MOSFETs for synchronous rectification in the secondary stage of switched mode power supplies (SMPS). Four new devices, developed by Toshiba Corp. (Toshiba), are optimized with low on-state resistance (RDS(ON)) to reduce power loss in the secondary stage of SMPS.

The first four MOSFETs in this product lineup are targeted for use in AC power adapters or AC-DC power supplies in computing, and consumer electronics applications. Three 75V devices and one 100V device can each be used as either the switch or synchronous MOSFET in the secondary stage of a SMPS.

“In loss simulation testing, Toshiba found that the RDS(ON) in a secondary stage MOSFET is the most critical factor related to power loss, typically accounting for 50 to 70 percent of the loss,” said Jeff Lo, business development manager, Discrete Power Devices, for TAEC. “As a result, Toshiba developed these low RDS(ON) devices to improve power efficiency.

Three 75V devices provide a choice of current rating, RDS(ON)and packaging. The TK40A08K3 has a current rating of 40A with RDS(ON) (typ.) of 7.0 mΩ , and is offered in a TO-220SIS package (TO-220F isolated). The TK80A08K3 has a current rating of 80A, RDS(ON) (typ.) of 3.6 mΩ and is offered in a TO-220SIS package. The 75V, 80A TK80D08K3 has similar electrical characteristics to the TK80A08K3, but is offered in a non-isolated TO-220(W) package (TO-220AB).

The fourth new MOSFET, TK40A10K3, is a 100V, 40A device with RDS(ON) (typ.) of 11.5 mΩ, and is offered in a TO-220SIS package.

Technical Specifications

Product Number Application Maximum Rating Gate Charge1 (typ.) Package RDS(ON) (mΩ) Process

@V GS =10.0V

VDSS (V) ID (A) Qg(nC) Typ. Max.

TK40A08K3 Secondary Stage MOSFET in SMPS 75 40 80 TO-220SIS 7.0 9.0 U-MOS IV

TK80A08K3 75 80 175 TO-220SIS 3.6 4.5

TK80D08K3 75 80 175 TO-220(W) 3.6 4.5

TK40A10K3 100 40 85 TO-220SIS 11.5 15.0

Pricing and Availability

Samples and mass production of the new Toshiba UMOS IV MOSFETs for synchronous rectification in SMPS are available now. Prices in sample quantities start at $0.80.

Toshiba’s Discrete Products

Since 1986, Toshiba Corp. has ranked as the top discrete supplier on a worldwide basis, based on annual revenue from international shipments of total discrete products. According to the most recent annual report from market research firm Gartner Dataquest (San Jose, CA), Toshiba remained the top discrete semiconductor supplier. (Source: “2007 Worldwide Semiconductor Market Share Report,” Gartner, April 2008). More specifically, Toshiba is a leading supplier in a number of discrete product categories, including power transistors, rectifiers, LMOS logic, CMOS logic, photocouplers, TOSLINKs, LEDs, small signal diodes and transistors. The company’s discrete devices are designed to meet the growing demand for high-performance and lower voltages in today’s wireless telecommunications and consumer electronics applications, while emphasizing its strength in the automotive and industrial markets.

*About TAEC and Toshiba Corp.

Through proven commitment, lasting relationships and advanced, reliable electronic components, Toshiba enables its customers to create market-leading designs. Toshiba is the heartbeat within product breakthroughs from OEMs, ODMs, CMs, distributions and fabless chip companies worldwide. A committed electronic components leader, Toshiba designs and manufactures high-quality flash memory-based storage solutions, discrete devices, displays, advanced materials, medical tubes, custom SoCs/ASICs, digital multimedia and imaging products, microcontrollers and wireless components that make possible today’s leading cell phones, MP3 players, cameras, medical devices, automotive electronics and more.

Toshiba America Electronic Components, Inc. is an independent operating company owned by Toshiba America, Inc., a subsidiary of Toshiba Corporation, Japan’s largest semiconductor manufacturer and the world’s third largest semiconductor manufacturer (Gartner, Preliminary 2008 WW Semiconductor Revenue, Dec. 2008). For additional company and product information, please visit http://www.toshiba.com/taec/ .

http://www.toshiba.com/taec/news/press_releases/2009/powr_09_558.jsp