Dual-channel drivers boast uniform LED intensity

A new family of two-channel, adaptable dual-gain 1-1.5x charge pump current regulators are ideal for white LED backlighting for small LCD displays or photo flash applications.

A new family of two-channel, adaptable dual-gain 1-1.5x charge pump current regulators are ideal for white LED backlighting for small LCD displays or photo flash applications.

The channel drivers are arranged in 3+2 (AQ9132) 3+3 (AQ9133) or 4+2 (AQ9142) configurations.

They drive parallel white LEDs, with up to 120mA total of programmable output current.

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

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

They feature a fixed 650kHz frequency.

In full shutdown mode, they draw only 10uA.

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

Each channel has independent enables, plus a system enable.

The LED brightness in each channel can be adjusted by applying a PWM signal to the channel.

Two versions of each device are available.

The B series offers independent LED current programming for each channel via the ISET1 and ISET2 pins.

The A series programs both channels with a single resistor.

They 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 ratio to maintain high efficiency over a broad input voltage range.

Internal overtemperature and overcurrent management provides short-circuit protection.

They are housed in small MLP-16 packages, with optional green (halogen- and Pb-free) chemistry.

The AQ9132A and B are priced at $1.09 each in thousands.

The other four devices are priced at $1.19 each in thousands.

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