Product category:
Power Supply ICs and Controllers
News Release from: Arques Technology | Subject: AQ9220
Edited by the Electronicstalk Editorial
Team on 16 December 2003
Buck controller joins with two LDOs
The AQ9220 is a highly integrated three-output voltage controller.
The AQ9220 is a highly integrated, three-output voltage controller The 9220 provides a dual-phase synchronous buck switcher plus two LDO controllers, with features that simplify the design of power supplies for systems demanding high performance, high density and low cost
This article was originally published on Electronicstalk on 2 Dec 2003 at 8.00am (UK)
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The dual-phase synchronous buck controller features a 5bit VID interface with adjustable step and offset voltages.
Power loss and noise are minimised by operating the PWMs 180 degrees out of phase.
Constant on-time regulation simplifies loop compensation and provides excellent transient response.
Lossless inductor current sensing and overcurrent protection maximises efficiency.
Active phase current sharing with adjustable ratio allows for different voltage sources for each phase, allowing distributed current demand among the available sources.
There are two LDO controllers: one is capable of driving an external N-channel mosfet for VDDQ, the other can drive two external N-channel mosfets to achieve current sourcing and sinking required for the VTT termination voltage of DDR memory.
This versatile device is designed for a wide range of compact, high performance applications such as AGP 3D graphics cards, personal computers, and VRM supplies.
The AQ9220 is available now packaged in either a MLP-40 or LQFP-44 package, and priced at $1.20 each, 1000-off.
Evaluation boards are also available.
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