Toshiba Expands White LED Driver Product Line With White LED Driver IC That Powers Up to 8 LEDs in Series20 October 2005
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 (http://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
Tech.Questions@taec.toshiba.com.
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.
All trademarks and tradenames used herein are the properties of their
respective holders.
Source: PR Newswire
All trademarks and copyrighted information contained herein are the property of their respective owners.
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