Japanese ROHM development of surplus small size LED driver series is applicable to all kinds of portable machine

Recently, the Japanese semiconductor manufacturer ROHM Corporation developed can be used for various portable machines (mobile phone, storage type audio equipment, Bluetooth headset etc.) on the 1.6 to 4 inch LCD backlight LED driver using the mini series, it was suitable for high density mounting ultra small WL-CSP (chip chip size package).

The development of the product line is suitable for 1.6 to 2.4 inch LCD using 2 to 3 lights: BD82103GWL (1.5 x 1.8 x 0.55mm), for 2 to 2.8 inch LCD using 3 to 4 lights: BD1204GWL (1.85 x 1.85 x 0.55mm) and 2.6 to4 for LCD using 5 inches to 6 lights: BD1206GUL (2 x 2 x 0.55mm) 3, number 2 with several lamps driver size are ultra small industry. 3 to 4 lamp type "BD1204GWL" and 5 to 6 lamp type "BD1206GUL" have begun to supply samples from November 2008, and is scheduled from June 2009 and May 2009 began to produce 1 million and 500 thousand scale mass production. As for the 2 to lamp type "BD82103GWL", has begun to supply samples, and has been on the scale of the production of 1 million months to start production. In addition, the production of 3 products are in the process of ROHM Corporation (Hamamatsu Shizuoka), the latter process in Fukuoka ROHM Corporation (Fukuoka county) completed.

Due to the structure and function of the mobile phone is diversified, mounted to the LCD display on the size of the mobile phone has become all kinds of backlight LED driver, also must form a product line so as to adapt to various situations with different number of LED lamps. In addition, the miniaturization and thinness of the machine itself is also deeply rooted, which strongly requires further miniaturization and thinning LED drive. In addition, the intermediate function of mobile phone configuration models are the active image application (TV) to become the standard configuration, because the image image regeneration display time is prolonged, so that the battery can last longer time, but also urgent for the LCD display part can work with low power consumption. In order to meet these requirements, the use of high-density installation of ultra small WL-CSP package to achieve the industry's ultra small size. Specifically, the new product and the traditional size (QFN product) compared to 2 to 3 lamp volume ratio decreased 84%, area ratio decreased from 70% LED to 3 to lighting lamp type 4; the volume ratio decreased 79%, area ratio decreased 62%; 5 to 6 lamp volume ratio decreased by 86% area ratio decreased 75%. 3 kinds of products are used without the need to increase the number of external coil (x 1, x 1.5, x 2 a total of 3) automatic switching charge pump. Take 1 control lines to control the level of to (0.125mA 20mA, analog Log curve) of the constant current drive UPIC (Uni-Port Interface Control) can reduce the number of wiring. The use of ultra small package, the reduction of external components and the reduction of the number of wiring, for the miniaturization of the machine, thin, provincial space design is very favorable. Also, the use of intermediate function configuration models in 2 to 4 inch LCD backlight for BD1204GWL and BD1206GUL two kinds of products, as a result of the circuit optimization and layout optimization design of super super, so although is also capable of ultra small PWM brightness control, is that we can use the PWM signal and image linkage control backlight. The multifunctional backlight LED driver has the function of being praised by users, and can be used for controlling the brightness of the backlight with the movable image. When the PWM control is adopted, the utility model has the function of restraining the output ripple, and can restrain the noise of the machine.

It is understood that the ROHM in the LCD backlight LED driver has been using a plurality of white LED lamps and boost mode, main / auxiliary light source and backlight, portable decoration and other means to meet the different needs, and manufacture of products with small and efficient expertise, highly valued in the market. In the future, ROHM also in the development of products in line with the needs of users at the same time, efforts to further expand and enrich the product line.