White LED Driver features automatic phase shifting.
June 9, 2011 -
Suited for LCD backlighting in tablet computers, Model AAT1451 drives up to 4 LED strings at up to 93% efficiency. Device uses 32 kHz PWM operating frequency to ensure silent operation and has switching frequency of 600 kHz to 1 MHz. To ensure accurate backlight color temperature and uniform brightness, driver has 4 current sinks that are programmable up to 30 mA per string at ±2% accuracy with ±1.5% matching between strings to drive up to 48 white LEDs at 120 mA output current.
(Archive News Story - Products mentioned in this Archive News Story may or may not be available from the manufacturer.)
|Original Press release |
Advanced Analogic Technologies Inc.
830 E. Arques Ave.
Sunnyvale, CA, 94085
AnalogicTech Targets Tablets with Automatic Phase Shifting White LED Driver for LCD Backlighting
SANTA CLARA, Calif., -- Advanced Analogic Technologies, Inc. (AnalogicTech(TM)) (Nasdaq: AATI), an analog semiconductor company focused on powering innovative solutions in consumer, industrial, and communications markets, today introduced the AAT1451, a high-efficiency white LED driver for liquid crystal display (LCD) backlighting applications in portable electronic devices such as the fast-growing tablet and the established computer markets.
"Power management considerations for system designers vary depending on the size of the display and the use-case scenarios they are targeting," said Ray Chan, Technical Marketing Manager of AnalogicTech. "With the AAT1451 we bring to market the most comprehensive feature set available in an LED driver that makes it possible for batteries to last longer, a critical differentiator in the rapidly growing tablet market. As a company, we now have LED drivers to support the entire range of LCD screen sizes from cell phones to large form factor televisions, all of which offer a wide variety of features and options to enhance the end-user experience."
The new AnalogicTech AAT1451 LED driver offers many innovative features that enable manufacturers to offer products with comprehensive feature sets that address consumer demands. For example, the AAT1451:
-- Drives up to four light emitting diode (LED) strings at up to 93 percent efficiency, and extends this efficiency to low LED brightness levels by automatic phase shifting, which further increases battery life.
-- Uses a 32 kHz pulse width modulation (PWM) operating frequency to ensure silent operation.
-- Has a high switching frequency (600kHz - 1MHz) to allow original equipment manufacturers (OEMs) to select small passive components resulting in lighter and smaller end products.
-- Offers a wide selection of DC input voltages so that devices can be powered from sources including cigarette lighter adapters and multi-cell Li-Ion batteries.
-- Incorporates comprehensive safety features to alert system controller and take corrective action by disabling shorted and open LED strings to prevent thermal fault conditions.
The AAT1451's proprietary PWM dimming reduces peak currents by as much as 75 percent and the 256 LED brightness levels support the Android operating system platform and Content Adaptive Brightness Control (CABC) to further increase battery life.
To ensure accurate backlight color temperature and uniform brightness across the entire display, the AAT1451 has four precision current sinks that are programmable up to 30mA per string at +/- 2 percent accuracy with +/- 1.5 percent matching between strings to drive up to 48 white LEDs at 120mA total output current.
The AAT1451 is priced at US$0.82 @10K units. For other quantities, contact AnalogicTech or its distributors. The AAT1451 is currently shipping.
-- Input Voltage Range: 2.7 to 26V
Integrated 50V Boost Converter
-- 32 kHz PWM frequency
-- Fully adjustable switching frequency of 600kHz to 1MHz.
-- Maximum I(out): 120mA
-- Integrated Fault Protection for:
-- Low Profile TDFN34-16 Package
-- -40 C to + 85 degrees C Temperature Range
About Advanced Analogic Technologies, Inc.:
Advanced Analogic Technologies, Inc. (AnalogicTech(TM)) (NASDAQ: AATI) develops advanced semiconductor system solutions that play a key role in the continuing evolution of feature-rich, energy efficient electronic devices. The company focuses on addressing the application-specific power management needs of consumer devices such as mobile handsets, digital cameras, and netbooks/notebooks, as well as devices in a broad range of industrial, medical and telecom applications. AnalogicTech also licenses device, process, package, and application-related technologies. Headquartered in Silicon Valley, AnalogicTech has design centers in Santa Clara and Shanghai, and Asia-based operations and logistics. For more information, please visit www.analogictech.com (AnalogicTech - G).
The AnalogicTech logo is a registered trademark of Advanced Analogic Technologies, Inc. AnalogicTech is a trademark of Advanced Analogic Technologies, Inc. All other brand and product names appearing in this document are registered trademarks or trademarks of their respective holders.