Analog dual white LED flash driver, effectively enhance the quality of the mobile phone camera image

In July 9th, Analog Devices (ADI) released a double white LED flash drive ADP 1655, can be in a battery operated digital camera in the current limited availability maximization, so that the brightness of the flash upgrade to 200lm and improve the quality of the image. ADP 1655 with inductor based flash drive can improve the mobile phone, digital camera (DSC), the reliability of the camera, PDA and other portable devices equipped with camera in high resolution camera operation, especially in the dark environment. In the application of mobile phone device, new drive patented emission shield (transmit masking) function allows the camera flash to LED high current operation, RF radio transceiver and can operate the phone, to monitor the signal sent by base station.

ADP 1655 integrated synchronous boost converter, a group of a group of 2MHz 500mA programmable current source, and a set of I2C interface, which makes the current timer and can easily be programmed and read the system operation and safety control of the relevant information can be repeated. ADP 1655 has a flash current accuracy of 5%, but also allows the camera to improve the current of LED without exceeding the safety limits that cause the phone to turn off.

ADP 1655 also includes a set of high-end current source, so that the flash LED string can be connected to the camera's ground plane, eliminating the need for LED to return to the IC route. This allows the design engineer to simplify the path on the printed circuit board, reduce the length of the circuit and the dissipation of heat, and the camera can be more sophisticated layout design.