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21 August 2012

Skyworks’ LED camera flash drivers support rapidly expanding Smartphone sales

Skyworks Solutions Inc of Woburn, MA, USA (which manufactures high-reliability analog and mixed-signal semiconductors) says it is capturing additional content in smartphone platforms with its light emitting diode (LED) camera flash driver solutions.

“Skyworks is excited to be supporting our customers as they capitalize on consumer demand for high quality images in the exploding smartphone market,” said Liam K. Griffin, executive vice president and general manager of high performance analog at Skyworks. “Our advanced suite of camera flash drivers demonstrates Skyworks’ ability to expand content in the fastest growing market segments, while also diversifying our broad analog product portfolio.”

According to information technology research and advisory firm Gartner Inc, mobile phone cameras will grow from approximately 1.6bn units in 2011 to over 2.2bn billion units in 2015, representing 92% of mobile phones worldwide. An additional 15% of them will have two cameras.

Skyworks says that its AAT1274 is a high efficiency, 1.5A high-current boost converter for LED photo flash applications. It maintains output current regulation by switching the internal high-side and low-side switch transistors, pulse-width modulated at a fixed frequency of 2 megahertz. The high switching frequency allows the use of a small external inductor and output capacitor, making it ideally suited in all single cell, Li-ion-powered applications.

Skyworks’ patented AS2Cwire (Advanced Simple Serial Control) digital interface is used to enable, disable, configure and program the operation of the device. Using the AS2Cwire interface, the movie-mode current level for the LED, and the flash-to-movie-mode current ratio can be programmed to one of 16 levels. The AAT1274 includes a separate flash enable input to initiate the flash operation and a flash-inhibit pin which reduces the flash current to movie-mode levels during high-battery demand.

The maximum flash and movie-mode current is set by one external resistor where the ratio of flash to movie-mode current is set at approximately 7:3:1. The AAT1274 can drive one high current LED. In addition, the device contains a thermal management system to protect it from an output short-circuit condition. Built-in circuitry prevents excessive in-rush current during start-up, and the part is available in a Pb-free, thermally-enhanced TDFN33-14 package.

Tags: Skyworks LED camera flash drivers


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