Dual-channel adjustable current-regulated white LED drivers

Oct. 20, 2004
Date Announced: 20 Oct 2004 Arques Technology has introduced new members to its expanding family of innovative white LED drivers; the AQ9132B, AQ9133B, and AQ9142B. Converting power from a single-cell Li-Ion battery, these two-channel, dual-gain (1X - 1.5X) charge pump current regulators are ideal for white LED backlighting for small LCD displays or photo flash applications. The drivers are arranged in two channels as 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 driver's current is matched to within 2% for uniform LED intensity and color. The drivers 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. They offer independent LED current programming for each channel via the ISET1 and ISET2 pins. The LED brightness in each channel can be independently adjusted by applying a PWM signal to the channel.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.

Michael Friends Arques Technology 1779 Wells Branch Parkway #110-B, 374 Austin, Texas 78728 Tel: +1 512 329 9835

E-mail:[email protected]

Web Site:http://arquestech.com