New Device Provides Over-Voltage Protection and Precise Brightness Control While Extending Battery Life
"Toshiba Corporation engineered the TB62737FUG white LED driver to provide an ideal combination of over-voltage protection, high-precision current regulation and high power-efficiency for today's advanced portable devices," said Don Schneider, business development manager of the ASSP Business Unit at TAEC. "The optimized design minimizes total circuit size, contributing to the cell phone's small form factor." Mr. Schneider noted that white LED drivers are a mainstay of the company's mixed-signal IC product strategy. He said that the company will continue to expand its product portfolio with other products targeted at cell phone applications as well as other portable end products, including PDAs, digital cameras and mobile game systems.
The TB62737FUG incorporates an over-voltage detection pin; this safety feature protects against an over-voltage condition in the circuit that could be caused by an open LED. The high power-efficiency of 87 percent extends rechargeable battery life. The device achieves high-precision current regulation of plus/minus 5 percent of the required value; this allows exact control of backlight brightness.
Main Features * Has an over-voltage detection pin that reduces the external part count while protecting the driver circuit * Achieves high power-efficiency of 87 percent, an improvement of 2 percent compared to previous products * Reaches a current precision guaranteed value of plus/minus 5 percent; can suppress white LED brightness fluctuation * 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 for low-power consumption and high integration * Achieves low power consumption and requires a minimum number of external components * Housed in an SOT23-6 package with package dimensions of 2.9mm high x 2.8mm wide, including lead length Development Background
Cell phones and other mobile products increasingly incorporate color LCD panels. Because these devices run on battery power with finite battery life, it is becoming more common to use a white LED that can emit bright light for backlighting while consuming little power. As a result, world demand for white LEDs is rapidly increasing. Toshiba is meeting these needs by bringing to market a white LED driver that realizes low-power consumption, high efficiency and high precision.
Pricing and Availability
Samples are currently available and volume production is scheduled to begin this month. Pricing is $0.98 each in 1K-piece quantities. The devices are available from Toshiba directly or through TAEC's VAR, Marktech Optoelectronics ( http://www.marktechopto.com/.)
Key Specifications Process BiCD 0.6micron -- 30V Function White LED driving Switching Method Peak current variation method Power Supply Voltage 2.8V-5.5V Output Rating 20mA at16V, 400mW Over-voltage Detection Voltage 19V-23.5V Package Dimensions 2.9mm H x 2.8mm W, including leads *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 semiconductors, flash memory-based storage solutions, and displays 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 Corporation, one of the five largest semiconductor companies worldwide in terms of global sales for the year 2003 according to Gartner/Dataquest's Worldwide Semiconductor Market Share Ranking. Toshiba is a world leader in high-technology products with more than 300 major subsidiaries and affiliates worldwide. 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 http://www.chips.toshiba.com/, or from your TAEC representative.
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