WLED Driver saves space in mid-range camera phones.
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Press Release Summary:
Supplied in Pb-free, 3 x 3 mm, 20-pin TQFN package and qualified across -40 to +85°C range, AAT2848 integrates 4 backlight channels capable of driving up to 30 mA each and 2 flash channels capable of driving up to 300 mA each. This tri-mode charge pump driver IC, intended for white LED backlight display and flash applications, offers serial digital interfaces to enable, disable, and set LED current. Additional functions include fade-in/fade-out and safety timer for flash LEDs.
Original Press Release:
AnalogicTech's New WLED Drivers Reduce Footprint of Mid-range Camera Phones
Highly Integrated IC Combines Four Backlight, Two Flash Channels in Compact Package
SANTA CLARA, Calif., June 10 -- Advanced Analogic Technologies, Inc. (AnalogicTech) (NASDAQ:AATI), a developer of power management semiconductors for mobile consumer electronic devices, announced today the AAT2848, a new tri-mode charge pump driver IC for white LED (WLED) backlight display and flash applications. By integrating four backlight channels capable of driving up to 30 mA each with two flash channels capable of driving up to 300 mA each, or 600 mA in parallel, in a small 3mm x 3mm TQFN33-20 package, this new device offers mid-range camera phone designers a highly attractive space-saving solution.
"Until recently designers building mid-range camera phones featuring cameras with 2 to 5 megapixel resolution needed to use independent devices for backlight and flash functions," said Phil Dewsbury, product line manager at AnalogicTech. "By integrating into a single compact IC both the backlight function and flash output current levels one would expect only from a discrete flash driver IC, the AAT2848 helps handset designers reduce board space, minimize component count and simplify their design."
New Fade-in/Fade-out Function
The AAT2848 is a tri-mode charge pump offering 1X, 1.5X and 2X operation. The IC drives four backlight LED channels at up to 30 mA each using the charge pump in dual mode (1X and 1.5X) and two flash LED channels at up to 300 mA each in tri-mode (1X, 1.5X and 2X).
To enable, disable and set LED current, the AAT2848 features two of AnalogicTech's patented Simple Serial Control (S(2)Cwire) serial digital interfaces. For backlight functions the device can set current to any of 32 programmable levels. The flash LED outputs can be set independently across 16 programmable levels. Full scale current is independently set for backlight and flash using external resistors.
The new driver IC also features an innovative fade-in/fade-out function which gradually increases backlight LED brightness from off to fully on across a 63-step linear progression. Fade time is controllable by an external capacitor. By replacing microprocessor-based software schemes for the same function, this feature offers a smoother transition to full brightness while reducing software overhead.
The device also adds a user-programmable safety timer to protect the flash LEDs from thermal damage. This function can be used to terminate a flash event after a pre-determined period of time. Both the safety timer and flash/strobe operation is enabled via a separate flash enable pin.
The AAT2848 also comes with integrated short-circuit and over-temperature protection. Soft start circuitry prevents excessive inrush current at start-up and during mode transitions.
Price and Availability
Qualified across the -40 C to +85 degrees C temperature range, the AAT2848 is available in a Pb-free, 20-pin TQFN package. The device sells for $1.42 in 1K quantities.
About AnalogicTech
Advanced Analogic Technologies, Inc. (AnalogicTech) is a supplier of Total Power Management(TM) semiconductor solutions for mobile consumer electronic devices, such as wireless handsets, notebook and tablet computers, smartphones, digital cameras, wireless LAN, and personal media players. The company focuses its design and marketing efforts on the application-specific power management needs of consumer, communications, and computing applications in these rapidly evolving devices. AnalogicTech also develops and licenses device, process, package, and application-related technology. AnalogicTech is headquartered in Santa Clara, California and Macau, S.A.R., with offices in China (Beijing, Shanghai and Shenzhen), Hong Kong, Taiwan, Japan, South Korea, Sweden, France and United Kingdom, as well as a worldwide network of sales representatives and distributors. The company is listed on the NASDAQ exchange under the ticker symbol AATI. For more information, please visit the AnalogicTech website: www.analogictech.com/. (AnalogicTech - G)
AnalogicTech and the AnalogicTech logo are trademarks of Advanced Analogic Technologies, Incorporated. All other brand and product names appearing in this document are registered trademarks or trademarks of their respective holders.
CONTACT: Karolien Cools-Wittry of AnalogicTech, +1-408-737-4600, karoliencw@analogictech.com; or Matthew Quint of Quint Public Relations, +1-650-599-9450, mquint@quintpr.com, for AnalogicTech
