Top efficiency claims for LED-driving regulators

Edited by the Electronicstalk editorial team Sep 27, 2004

The AQ9130 and AQ9140 are adaptable-gain 1x, 1.5x charge-pump current regulators that are ideal for white LED backlighting for small LCD displays or photo flash applications.

The AQ9130 and AQ9140 are adaptable-gain 1x, 1.5x charge-pump current regulators that are ideal for white LED backlighting for small LCD displays or photo flash applications.

They are capable of driving up to three (AQ9130) or four (AQ9140) parallel white LEDs, with up to 120mA total of programmable output current.

Each LED's driver current is matched to within 2% for uniform intensity.

They operate over the typical Li-ion input voltage range of 2.7 to 6.0V, with undervoltage lockout.

They feature an efficient, inductor-less, 1.5x charge-pump circuits that use only a few ceramic capacitors, allowing a compact, low profile design.

The programmable LED current is via ISET1 pin The LED brightness can be adjusted by applying a PWM signal the ENB pin.

The ENB pin can also be used for a timed photo flash.

They feature a fixed 650kHz frequency.

In full shutdown mode, they draw only 10uA.

The AQ9130 and AQ9140 offer unique performance advantages over previously available devices, allowing the highest level of efficiency.

Proprietary design architecture (patent pending) automatically selects the most efficient charge-pump gain ratio to maintain high efficiency over a broad input voltage range.

Internal overtemperature and overcurrent management provides short-circuit protection.

The AQ9130 and AQ9140 are packaged in small MLP-16 packages, they are also available in optional green (halogen- and Pb-free) packaging ($0.89 each 1000-off).