Toshiba Expands White LED Driver Product Line With White LED Driver IC That Powers Up to 8 LEDs in Series
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Toshiba Expands White LED Driver Product Line With White LED Driver IC That Powers Up to 8 LEDs in Series

New Device Ideal for Cell Phones and Other Small Portable Devices, Boasts High Output Power For Up to 800mW and Provides Surge Protection

SAN JOSE, Calif., Oct. 19 /PRNewswire/ -- Toshiba America Electronic Components, Inc. (TAEC)* today announced the expansion of its constant-current white LED driver product line with a new driver IC that powers the multi- segment white light-emitting diodes (LEDs) used to backlight the new, larger color liquid-crystal display (LCD) panels in small portable devices such as cell phones and PDAs. Designated TB62752AFUG, the high-precision, high-performance switching white LED driver IC can drive 2 to 8 LEDs serially, has high output power for up to 800 milliwatts (mW) LED loading and features a built-in surge-protection function.

"With the trend toward larger and larger LCD panels in each generation of portable devices, there is a commensurate need for excellent illumination of these displays in a compact, efficient solution. To meet this demand, Toshiba Corporation engineered the TB62752AFUG white LED driver, which easily drives a string of up to 8 white LEDs in series and has high output power for 800mW LED loading," said Andrew Burt, director of the Wireless Business Unit at TAEC. "As well, the new device features built-in surge protection." Mr. Burt explained that if an LED should break, the circuit will detect this potential overload situation and clamp the output while continuing to illuminate the other working LEDs; this ensures safe operation of the device.

    Main Features

     * Can drive a string of up to 8 white LEDs in series using a Li-ion
       battery
     * Employs high withstand voltage process with switching withstand voltage
       of 40 volts (V), standard 37V output voltage.
     * Features a surge-detection pin that reduces the external part count
       while protecting the driver circuit
     * Achieves high power-efficiency of 80 percent or more during 7-segment
       white LED operation
     * Reaches a current precision guaranteed value of plus or minus 5
       percent; can suppress white LED brightness fluctuation; achieves a
       capability value of plus or minus 3 percent.
     * Uses Bi-CD process that includes a Double Diffused MOS (DMOS) with a
       high-withstand voltage and large-current capacity as well as a bipolar
       transistor with a high-current drive and CMOS FET for low-power
       consumption and high integration
     * Designed with highly compatible pin placement
     * Housed in a lead-free SOT23-6 package with package dimensions of 2.9mm
       deep (D) x 2.8mm wide (W), including lead length, a tiny package
       suitable for very compact portable applications

    Development Background

Cell phones and other compact portable products incorporate color LCD panels that are growing in number and size from product generation to generation. As the display size increases, more white LEDs are required for backlighting. To meet this need, Toshiba developed the TB62752AFUG, which can drive up to 8 LEDs in series.

The Toshiba constant-current white LED driver product line consists of both switching and charge pump drivers for white LEDs. The switching drivers are targeted for applications such as cell phones and PDAs that require high efficiency, accuracy and drive capability with minimal external components. The charge pump drivers include high-current drive with reduced noise.

Pricing and Availability

Samples are currently available and mass production is scheduled to begin in December 2005 at a production volume of approximately 5 million units per month. Current pricing is $0.99 each in 1,000-piece quantities. The devices are available from Toshiba directly or through TAEC's VAR, Marktech Optoelectronics ( www.marktechopto.com). For more information, please visit: http://www.marktechopto.com/products/led_drivers.cfm.

    Key Specifications

     Process                    BiCD 0.6 micron - 40V
     Function                   White LED driver, DC/DC converter type
     Circuit Format             Switching format
     Recommended Coil           10-22uH
     Power Supply Voltage       2.8V-5.5V
     Output Rating              7-segment:  25mA or greater, 800mW
                                (reference)
     Surge Detection Voltage    34.5V-39.5V
     Package Dimensions         2.9mm D x 2.8mm W x 1.3mm H, including lead
                                length

    *About TAEC

Combining quality and flexibility with design engineering expertise, TAEC brings a breadth of advanced, next-generation technologies to its customers. This broad offering includes memory and flash memory-based storage solutions, a broad range of discrete devices, displays, medical tubes, ASICs, custom SOCs, microprocessors, microcontrollers and wireless components for the computing, wireless, networking, automotive and digital consumer markets.

TAEC is an independent operating company owned by Toshiba America, Inc., a subsidiary of Toshiba Corp. (Toshiba), Japan's second largest semiconductor manufacturer and the world's ninth largest integrated manufacturer of electric and electronic equipment. In almost 130 years of operation, Toshiba has recorded numerous firsts and made many valuable contributions to technology and society. For additional company and product information, please visit TAEC's website at chips.toshiba.com. For technical inquiries, please e-mail Email Contact.

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 www.chips.toshiba.com, or from your TAEC representative.

All trademarks and tradenames used herein are the properties of their respective holders.

CONTACT: Judy Kahn, +1-650-948-8881, Email Contact, for Toshiba
America Electronic Components, Inc.; or Deborah Chalmers of Toshiba America
Electronic Components, Inc., +1-408-526-2454,
Email Contact

Web site: http://www.marktechopto.com/products/led_drivers.cfm/
http://www.marktechopto.com/
http://www.chips.toshiba.com/
http://www.toshiba.com/taec/