Leadis Technology Announces a New Family of Induct
Date Posted:2008-7-3 15:55:11
Leadis Technology, Inc., an analog and mixed-signal semiconductor developer of color display drivers, power management ICs, white/RGB LED drivers, and audio ICs for mobile consumer electronic devices, announced today the sample availability of the LDS8620 and the LDS8621 -- a new family of inductorless 200 mA, dual-output LED flash/lamp drivers, in low-profile (0.8mm), space-saving 3x3mm TQFN packages.

ĦĦĦĦ"With the LDS8620 and the LDS8621, Leadis continues to expand its charge-pump-based product portfolio by addressing fast-growing markets in portable LED lighting applications," said Adolfo Garcia, Senior Director of LED Drivers for Leadis Technology. "Some examples of portable lighting applications include LED flashlights, flash/lamp LEDs in video and camera cellphones, PDAs, smartphones, and digital cameras."

ĦĦĦĦConsistent with providing high-quality, cost-effective solutions for the market, Leadis has joined with Seoul Semiconductor, a recognized developer and market leader of high-current, high-brightness white and RGB LEDs. "We enthusiastically recommend that our customers use Seoul Semiconductor`s flash LEDs, especially the FCW301Z (in single flash LED applications) with our LDS8620 or the LDS8621," Garcia continued. "The multi-mode architecture of the LDS8620/21`s inductorless boost converter with their LED`s low and stable VF (forward LED voltage) and its high luminous intensity combine to produce a very high-performance, high-efficiency solution."

ĦĦĦĦ"We are pleased that Leadis has chosen to recommend our flash LEDs, especially the FCW301Z, with their LDS8620 and LDS8621 LED flash/lamp driver ICs. Leadis is proving to be a valuable partner with innovative LED driver solutions to complement our high-current, high-brightness LEDs," said Daniel Park, PR Manager of Seoul Semiconductor.

ĦĦĦĦThe LDS8620 and the LDS8621 are not only optimized for portable lighting applications powered by Li-ion/polymer batteries. They operate very efficiently from single Li/MnO2 batteries, from 3 AA dry cell batteries, and from fixed power supplies up to 5.5V. To achieve up to 95% efficient operation, both products implement a multi-mode boost converter that automatically switches from 1x to 1.33x to 1.5x to 2x to maintain regulated LED current, in torch or full-flash mode. External component count is kept to a minimum (two, low-cost 0.22µF switching capacitors and two, 1µF bypass capacitors) because LED flash current is factory preset to 96mA per output. The LDS8620 and the LDS8621 also incorporate Leadis` proprietary, ultra low voltage dropout PowerLite(TM) Current Regulator (PCR(TM)) technology which allows the inductorless boost converter to remain in 1x operating mode longer, extending battery run time.

ĦĦĦĦProduction availability of the LDS8620 and the LDS8621 is scheduled for Q3 2008.

ĦĦĦĦAbout the LDS8620

ĦĦĦĦTo configure one or both LED[A/B] outputs and to set the LED current for torch (or movie-mode) or full-flash operation, the LDS8620`s logic interface at its EN/SET pin implements an industry-common, single-wire protocol. Its internal current control register is 6 bits deep, providing a 1.5mA LED current resolution from 0.5mA to 96 mA. Single-wire LED configuration/control interface is very useful in flip-style cell phones where the high-current LED and the LED driver are found on opposite sides of a cellphone`s hinge.

ĦĦĦĦAbout the LDS8621

ĦĦĦĦThe LDS8621 is parametrically identical to the LDS8620 except that its output configuration and LED current are controlled through a two-wire, dual-role logic interface. Its logic interface functions as both an IC enable and a PWM-mode flash LED brightness control. Its PWM1 input pin controls the operation of the LEDA output as its PWM2 input pin controls the operation of the LEDB output. Both PWM1 and PWM2 input signals can be controlled independently or connected together and driven by an application/baseband processor`s GPIO interface.

ĦĦĦĦAbout Leadis Technology, Inc.

ĦĦĦĦLeadis Technology, Inc., headquartered in Sunnyvale, California, designs, develops and markets analog and mixed-signal semiconductors that enable and enhance the features and capabilities of portable and consumer electronics devices. Leadis` product offerings include color display drivers, which are critical components of displays used in portable 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; audio CODEC and FM transmitter ICs, which are integral components in portable media players and their associated aftermarket accessories; and touch controller ICs, which enable highly reliable touch-based input controls and attractive industrial design options for both mobile and non-mobile applications.

Publisher:China Conserves energy lamp net