SOURCE: Leadis Technology, Inc.

March 03, 2008 10:30 ET

Leadis Technology Announces a New Family of No-Noise, 98%-Efficient, Four-Channel White LED Drivers

SUNNYVALE, CA--(Marketwire - March 3, 2008) - Leadis Technology, Inc. (NASDAQ: LDIS), an analog and mixed-signal semiconductor developer of color display drivers, power management ICs, LED drivers, and audio ICs for mobile consumer electronic devices, today announced the sample availability of the LDS8845 and the LDS8846, a new family of no-noise, highly efficient 4-channel white LED drivers. These latest product offerings target a new generation of low-cost handsets and portable products that use lower-VF white LEDs and lower-cost TFT-LCD modules.

"With the LDS8845 and the LDS8846, Leadis is addressing the emerging and fast-moving trend in handset applications to using lower-VF white LEDs," said Adolfo Garcia, Senior Director of LED Drivers for Leadis Technology. "Lower-VF white LEDs make it easier to maintain LED current absolute accuracy and channel-to-channel match by eliminating the need for an internal boost converter to increase the driver's output voltage. Eliminating the need for dual-mode (1x/2x) or tri-mode (1x/1.5x/2x) charge-pump boost converters -- two methods used in conventional white LED driver products -- further reduces system cost by eliminating up to two ceramic capacitors required by the boost converter. Additional benefits to eliminating the boost converter include: (1) the overall circuit's form factor is reduced (by up to 13%); (2) the LED driver generates no noise; and (3) the current drawn from the battery by the application circuit is the same as the total LED output current, resulting in longer battery operation on a single charge."

Although the design of this family of white LED drivers has been simplified, performance has not been compromised. All products in this family will offer part-to-part LED current accuracy better than 7.5% and channel-to-channel matching better than 3% -- an improvement of at least 25% over alternative dual-mode and tri-mode charge-pump based white LED drivers. In addition, both products offer true-load disconnect in shutdown, output overcurrent protection, thermal shutdown protection, and a 100kHz-rated LED current control interface for those applications where it is desirable to minimize or eliminate audio band noise injection.

To achieve 98% efficient operation from a single-cell Li-ion battery, the design of the LDS8845 and the LDS8846 implements Leadis' proprietary, ultra low voltage dropout PowerLite™ Current Regulator (PCR™) technology which maintains current-sink threshold voltages below 50mV. The application of the company's PCR™ technology in this new family of white LED drivers permits the LDS8845 and the LDS8846 to operate at lower system cutoff voltages while maintaining excellent LED current regulation.

About the LDS8845

Packaged in 0.8mm high, 3x3mm 16-lead TQFN packages, the LDS8845 operates from 2.7V to 5.5V. An inexpensive, 15.8k(Omega) resistor sets the LDS8845's full-scale LED output current to 30mA per channel and allows the system designer to program the full-scale LED current to lower full-scale levels, if desired. A two-wire interface is provided to program the 4 LEDs as a single group or individually; in addition, the control interface can accept a pulse-width modulated (PWM) signal to adjust optionally the average LED current through duty cycle control.

In addition to the 16-lead TQFN package, the LDS8845 will be made available in a 0.8mm high, 3x3mm 12-lead TDFN by the close of the second quarter of 2008.

About the LDS8846

The LDS8846 is parametrically identical to the LDS8845, offering a third control input, in pin-compatible 0.8mm high, 3x3mm and 4x4mm 16-lead TQFN packages. The third control input allows the system engineer to configure the LDS8846's LED drivers in one of eight configurations for maximum flexibility. Like the LDS8845, the LDS8846's control input can accept a PWM signal to adjust the average LED current. By the close of the second quarter of 2008, the company expects that a 0.8mm high, 3x3mm 12-lead TDFN package option for the LDS8846 will be made available.

For more information, visit

Contact Information:
Tracy Lam,
Director, World-Wide Marketing Communications
Leadis International Ltd.,
Tel: 852-21528880

About Leadis Technology, Inc.

Leadis Technology, Inc., headquartered in Sunnyvale, California, designs, develops and markets analog and mixed-signal semiconductors that enable and enhance the features and capabilities of mobile and consumer electronics devices. Leadis' product offerings include color display drivers, which are critical components of displays used in mobile consumer electronic devices; LED drivers, which provide controlled levels of current required to drive light emitting diodes in diverse applications including mobile backlight units; Power Management ICs including LDOs, LDO controllers, shunt references, thermal switches, current regulators, and battery charger controllers; and audio CODEC and FM transmitter ICs, which are integral components in mobile media players and their associated aftermarket accessories. Leadis currently supplies display drivers supporting the major small panel display technologies, including a-Si and LTPS TFT LCDs, color STN LCDs, and color OLED displays, LED drivers supporting mobile backlighting applications, and audio ICs supporting portable media players and aftermarket audio accessories.

Certain statements in this press release including, but not limited to, statements as to the anticipated features, capabilities, benefits, potential market size, intended uses and performance of Leadis' new LED Driver ICs, are forward-looking statements that are subject to risks and uncertainties that could cause results to be materially different than expectations. Such risks and uncertainties include, but are not limited to, delays in ramping new products into production, lack of market acceptance of our new products, risks associated with the company's efforts to expand its business beyond LCD display drivers, including the new LED drivers, delays in the integration of our ICs into consumer electronic devices, our reliance on third-party manufacturers, general mobile handset and semiconductor industry trends, and other risks detailed from time to time in Leadis' reports filed with the Securities and Exchange Commission including its Form 10-K for the year ended December 31, 2006 and its Form 10-Q for the quarter ended September 30, 2007. Leadis disclaims any obligation to update these forward-looking statements. (LDISG)

Contact Information

  • Media Contact:
    Elizabeth Estrella-Basilio
    Cross Border Communications-SFO, Inc.
    Email Contact