Date: 29/09/2011

LCD backlight driver IC from ST senses current from high side

STMicroelectronics has added new backlight driver IC for driving white LEDs used as backlight in LCD panels. This IC is designed for mobile devices. The STLA02 drives with the high-side current sensing only, which allows the backlight negative (low-side) terminal to be connected directly to ground with no need for a low-side sensing connection.

The STLA02 can drive up to six LEDs and can operate from a supply voltage as low as 2.5V, allowing its use in systems powered by only a single lithium cell and the maximum input voltage of 18V also allows use with a variety of other battery types.

Key features of STLA02 include:
Boost (step-up) DC-DC converter topology
Battery supply voltage range: 2.5V to 18V
Maximum LED driving voltage: 27V
Output current: 20mA per LED
Switching frequency: 2.3MHz
PWM dimming range: 300:1
Enable pin with fast response due to current-mode regulation
Built-in over-temperature and over-voltage protection

Available: Now in production quantities
Price: $0.892 each for 1K units
Package: 6-lead DFN6 package


For further information visit www.st.com