New Industry Products

Arques Technology Intros AQ9156B/AQ9153 LED Drivers

September 13, 2004 by Jeff Shepard

Arques Technology (Austin, TX) introduced the newest additions to its expanding line of white LED drivers, the AQ9156B and AQ9153. These dual-mode 1X - 1.5X switched-capacitor (charge pump) regulators are suitable for white LED backlighting and photo flash applications.

The output is a regulated 4.5 V, with up to 120 mA continuous output current, or 200 mA pulse current. They are capable of driving up to six parallel white LEDs, over the typical lithium-ion input-voltage range of 3 V to 6 V. They feature a 1.5X charge-pump circuit that uses only two ceramic bucket capacitors and two small filter capacitors for Vin and Vout, allowing a compact, low profile system design. The AQ9156B offers a selectable switching frequency of 262 kHz or 650 kHz, while the AQ9153 features a fixed 650 kHz frequency.

A proprietary design architecture maintains high efficiency of >80%, at both below 3.2 Vin, resulting in longer battery life, and above 5.25 V, when an adapter is plugged in, keeping the part cool. The output voltage is regulated to 4.5 V, ±5% over the line and load ranges, with low output ripple voltage. Internal over-temperature and over-current management provides short-circuit protection.

The AQ9156B is available in a small MLP-10 or MSOP-10 package for $0.99 each for 1,000-piece quantities (also available in optional halogen-free, lead-free packaging). The AQ9153 is available in a small MSOP-8 package for $0.79 each for 1,000-piece quantities.