LED Driver provides 120 mA of programmable output current.
September 29, 2004 - Suited for white LED backlighting, Series AQ consists of 2-channel, dual-gain current regulators with inductorless, 1–1.5x charge-pump circuit. Each LED's driver current is matched to within 2% for uniform LED intensity and color. Driver operates over Li-Ion input voltage of 2.7–6.0 V, with undervoltage lockout. It features fixed 650 kHz frequency, and in full shutdown mode, draws only 10 µA. Unit is suited for small LCD displays or photo flash applications.
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Original Press release
Arques Technology
1779 Wells Branch Parkway
Austin, TX, 78728
USA
Dual-channel Current-regulated White LED Drivers
Arques Technology introduces new members to its expanding family of white LED drivers; the AQ9132A, AQ9132B, AQ9133A, AQ9133B, AQ9142A, and AQ9142B. These two channel, adaptable dual-gain 1X - 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).They drive parallel white LEDs, with up to 120 mA total of programmable output current. Each LED's driver current is matched to within 2% for uniform LED intensity and color. They operate over the Li-Ion input voltage range of 2.7V to 6.0V, with undervoltage lockout. They feature a fixed 650 kHz frequency. In full shutdown mode, they draw only 10 uA.
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. 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 over-temperature and over-current management provides short circuit protection.
They are packaged in a small MLP-16, with optional Green (halogen-free, Pb-free) packaging. |
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