Toshiba Monolithic DC-DC Step-Down Converters With 1 Amp Output Current Offer Low Enable Threshold Voltage And 95% Efficiency

Two Step-down Converters with up to 1A Output Current and Input Voltage from 2.7V to 5.5V Offer Choice of Fixed or Variable Output Voltage, Synchronous Rectification and Soft Start Time

IRVINE, Calif., Sept. 10 /PRNewswire/ -- Toshiba America Electronic Components, Inc. (TAEC)*, a committed leader that collaborates with technology companies to create breakthrough designs, today announced two new single-chip DC-DC converter ICs with 1 Amp (A) (max.) output current (I(OUT)), intended for use as step-down converters in electronic devices to provide a simple power solution with high efficiency of 95 percent (typ.)(1) that helps to reduce system power consumption and product size.

Developed by Toshiba Corp., the monolithic DC-DC converters support input voltage (V(IN)) from 2.7V to 5.5V. They offer a choice of either adjustable output voltage from 0.8V to (V(IN) - 1)V, (typ.), available in the TB7102AF, or fixed output voltage, offered in the TB7101AF, with available output voltages to be specified when ordering of 1.2V, 1.5V, 1.8V, 2.5V or 3.3V. Both devices have low enable threshold voltage (V(IH)(EN)) of 1.5V, and V(IL)(EN) of 0.5V, at V(IN) of 2.7 and 5V.

The two devices integrate high- and low-side MOSFETs, a PWM controller and MOSFET driver into a single monolithic IC. They also include a selection of built-in functions including synchronous rectification, under voltage lockout, thermal shutdown, over current protection, and soft start time. A high 1MHz oscillation frequency allows use of small external components. The TB7101AF and TB7102AF are offered in compact, low thermal resistance PS-8 packages measuring 2.9mm x 2.8mm x 0.8mm.

"These single chip buck converters combine low on-state resistance (R(DS)(ON)) internal MOSFETs using synchronous rectification with internal phase compensation to achieve high efficiency with a minimum of external components," said Jeff Lo, business development manager, Discrete Power Devices, for TAEC.

Technical Specifications and Features

                                         Output  Switching
Part    Features    Input      Output    Current Frequency   Phase
Number            Voltage(V) Voltage(V)   (A)      MHz   Compensation  Package
                                         (max.)   (typ.)    Circuit
      -Synchronous             Fixed,
TB7101AF Rectifier 2.7 to 5.5  specify                                   PS-8

-Under voltage 1.2V, 1.5V, 1.0 1MHz Internal 2.9mm x

         lockout             1.8V, 2.5V,                               2.8mm x
       - Thermal              or 3.3V                                   0.8mm

TB7102AF shutdown 2.7 to 5.5

       Over current          Adjustable                                  PS-8
        protection          from 0.8V to  1.0      1MHz     Internal   2.9mm x
      - Soft start           (V(IN)-1)V                                2.8mm x
          time                 (Typ.)                                   0.8mm

Pricing and Availability

Samples of the Toshiba TB7101AF and TB7102AF monolithic DC-DC converters are available now, with prices in sample quantities starting at $0.72.

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, released April 2008). More specifically, Toshiba is a leading supplier in a number of discrete product categories, including power transistors, rectifiers and thyristors, 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, 2007 WW Semiconductor Revenue, April 2008). For additional company and product information, please visit

Information in this press release, including product pricing and specifications, content of services and contact information, is current and believed to be accurate on the date of the announcement, but is subject to change without prior notice. Technical and application information contained here is subject to the most recent applicable Toshiba product specifications. In developing designs, please ensure that Toshiba products are used within specified operating ranges as set forth in the most recent Toshiba product specifications and the information set forth in Toshiba's "Handling Guide for Semiconductor Devices," or "Toshiba Semiconductor Reliability Handbook." This information is available at, or from your TAEC representative.

(1) At V(IN) = 5V, V(OUT) = 3.3V, I(OUT) =300 mA , T(a) = 25 degree C, L= 3.3microH, C(OUT) = 10 microF

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