Current-Output Charge Pump suits LED flash applications.
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Press Release Summary:
Tri-mode AAT3175 can drive up to 3 flash white LEDs at 300 mA total current with current sharing from 2.7-5.5 V source. It combines load switch (1X), fractional (1.5X), and doubling (2X) capability with internal sensing circuit to match output to LED requirements. Completely programmable via S2Cwire digital interface, product operates at 1 MHz switching frequency and can be set to 16 current levels. With 4 current sink channels, AAT3175 accommodates single, 2-in-1, or 3-in-1 LEDs.
Original Press Release:
AnalogicTech Announces High Efficiency Current-Output Charge Pump for White LED Flash Applications
Tri-Mode Device Delivers up to 300mA to Drive Camera Flash LEDs
SUNNYVALE, Calif., Oct. 3 / -- Advanced Analogic Technologies Incorporated (AnalogicTech) (NASDAQ:AATI), a developer of power management semiconductors for mobile consumer electronic devices, today introduced the AAT3175, a low noise, high frequency, current mode charge pump for white LED flash applications. As AnalogicTech's first dedicated current mode fractional/doubler charge pump for camera flash applications, the AAT3175 is capable of driving up to three flash LEDs at 300mA total current with current sharing from a 2.7V to 5.5V source.
"As the number of mega-pixels increases in camera phones, so does the brightness requirement of the white LED photo flash. Therefore, more accurate current control is required. Current sink charge pumps are specifically designed to meet this requirement," said Kin Shum, Director of Strategic Marketing for AnalogicTech. "For flash current of 300mA or below, we believe that the AAT3175 is the best-in-class driver on the market, and the 1x/1.5x/2x conversion offers excellent efficiency in both flash and torch/movie mode."
Serial Digital Control
The tri-mode device maximizes efficiency by combining a load switch (1X), fractional (1.5X), and doubling (2X) capability with an internal sensing circuit to match output to LED requirements. The new charge pump is also completely programmable via AnalogicTech's innovative S2Cwire (Simple Serial Control) digital interface. The single wire interconnect is used to enable, disable, and set current for all LEDs across 16 current levels, capable of controlling movie-mode lighting or camera flash.
With four current sink channels (100/50/50/100mA capability), the AAT3175 can accommodate single, 2-in-1, or 3-in-1 LEDs with high-precision current matching. Operating at a 1MHz switching frequency, the AAT3175 requires just two 1uF flying capacitors and two small 1uF capacitors at VIN and VOUT. The device also features integrated protection for VOUT short-circuit conditions and auto-disable for load short-circuit protection on any individual channel. Soft-start circuitry prevents excessive inrush current during start-up.
Price and Availability
The AAT3175 is immediately available in a Pb-free, thermally-enhanced, 12-pin 3x3mm TDFN package. The device sells for $1.22 in 1,000-piece quantities.
About AnalogicTech
Advanced Analogic Technologies Incorporated (AnalogicTech) is a supplier of power management semiconductors for mobile consumer electronic devices, such as wireless handsets, notebook and tablet computers, smartphones, digital cameras, and digital audio 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 is headquartered in Sunnyvale, California, with offices in Beijing, Hong Kong, Japan, Shanghai, Shenzhen, South Korea, Sweden, and Taiwan, as well as a worldwide network of sales representatives and distributors. For more information, please visit the AnalogicTech website: www.analogictech.com. (AnalogicTech - G)
NOTE: 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: Erik Ogren of AnalogicTech, +1-408-737-4600, or erikogren@analogictech.com; or Matthew Quint of Quint Public Relations, +1-650-599-9450, or mquint@quintpr.com, for Advanced Analogic Technologies Incorporated
