ST release display backlight LED controller chip STLED25

STMicroelectronics semiconductor suppliers across multiple electronic applications, the world's leading (STMicroELectronics, referred to as ST; the New York stock exchange code: STM) released a new chip LED screen backlight controller. The new product can simplify the circuit design of the mobile phone and other portable electronic products, provide stable and high-quality lighting light source for the display screen, and release more circuit board space, which is helpful for prolonging the service life of the battery.

High efficiency, compact size and high durability make the white LED backlight the first choice for many mobile phones. LED needs constant current drive, and provide a constant current driving circuit is composed of a controller and a plurality of elements. STMicroelectronics new controller STLED25 monolithic integration can drive up to 10 LED control circuit, so STLED25 can not only simplify the design of the phone, but also for other functions to release more board space.

STLED25 inherits the design and manufacture of semiconductor advanced Italy, five can be directly connected to the current source bridge arm end of the LED, and the lower bridge arm can be directly connected to the ground, no need to each LED channel is connected back to the controller, which can achieve a more compact, robust and reliable design. STLED25 requires only one external resistor to set the LED drive current.

The operating voltage of the STLED25 is 2.3V to 5.5V, which is suitable for the electronic products with the battery as power supply. Through the two independent control pins, the controller chip can drive the 5 branch channels. Whether in the maximum brightness or dimming mode, the controller can ensure that the voltage conversion and current control circuit has a high energy efficiency, to maximize the battery life. In addition, the current matching degree of each channel is very accurate, so as to ensure the consistency of the backlight brightness, and further improve the consumer experience.

The main characteristics of STLED25:

* 1.4 x 1.8mm chip package

Total solution area: 15.6mm2

Output current: 5 x 25mA

Energy efficiency: 85- 87%

PWM dimming

Channels can be turned on / off

Current limiting and protection circuit

STMicroelectronics has to provide STLED25 samples to major customers, the use of 12 solder ball 0.4mm pitch chip package, is expected to be put into mass production in December 2011.