National Semiconductor has introduced its smallest white LED driver IC which incorporates dynamic display backlight control. 

The LM3530 drives up to 11 high-current LEDs in series, illuminating larger displays in portable media devices such as smartphones. 

It is offered in a 12-bump micro SMD package measuring 1.615x1.215x0.425mm.

The driver incorporates ambient light-sensing algorithms and content-adjustable backlighting to optimise the display to realise power saving.

The current-mode boost converter can supply up to 29.5mA of power to 11 white LEDs from a single-cell Lithium-Ion battery.  It is programmabile via an I2C compatible interface.

The programmable ambient light response along with a separate pulse-width modulation (PWM) dimming input enable the backlight LED driver to determine lighting requirements and select between various dimming option. 

Logarithm and linear LED brightness mapping provides flicker-free dimming.  A fixed-frequency, 500kHz boost converter provides high efficiency over the LED current range.