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White LED controller offers 5 current sources

Posted: 16 Nov 2011     Print Version  Bookmark and Share

Keywords:battery life  controller IC  LED backlight  white LED 

STMicroelectronics N.V. (ST) announces STLED25, white LED backlight controller IC that claims to extend battery life and save PCB space by integrating control circuitry for up to 10 LEDs on a single chip.

The STLED25 claims to simplify circuitry for consistent high-quality backlighting and is said to be geared for cellular handsets and portable electronics.

According to ST, white LED backlights are preferred in many handset designs for their high efficiency, small size and long-term reliability. The LEDs are driven at constant current, usually using a controller IC and several additional components.

STLED25

The STLED25 operates from 2.3-5.5V in battery-powered electronics.

The STLED25 offers five current sources that can be connected directly to the LED high-side terminals, allowing the low side to be connected directly to ground. This eliminates the need to connect each LED channel back to the control IC, enabling a compact, robust and reliable design, the company stated. The LED drive current is set using a single external resistor.

The device operates from 2.3-5.5V in battery-powered electronics and enables driving and control of five branch channels via two independent control pins. The voltage conversion and current control circuitry operates efficiently whether driving the LEDs at maximum brightness or dimmed, claimed ST. In addition, close matching of the current in each channel ensures consistent backlight brightness, contributing to a better user experience, continued the company.

The controller IC features PWM dimming and 85-87 per cent efficiency. It delivers 5x25mA output current and a total footprint of 15.6mm2.

The STLED25 is sampling to lead customers in the 12-bump, 0.4mm-pitch 1.4x1.8mm CSP, with full production availability expected in December this year. The device is priced at Rs.67.26 ($1.50) for orders more than 1000 pieces.





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