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Low-Cost, Dual-/Quad-Channel, Sink/Source Current DACs Simplify Power-Supply Adjustments
2-/4-Channel, I²C, 7-Bit Sink/Source Current DACs
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Note to Editor:
- The DS4422/DS4424 are dual-/quad-channel, sink/source current DACs.
- These devices provide a low-cost method of controlling power-supply voltages with minimal power-supply redesign.
- The DS4422/DS4424 use a current change at the feedback node to manipulate the power-supply output voltage, thus allowing the devices to be connected to an existing power supply without redesign.
- These devices are ideal for DC-DC power-supply applications—such as servers and video processing cards—that require system-level voltage control, voltage calibration, or voltage-margining tests.
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SUNNYVALE, CA—June 30, 2008—Maxim Integrated Products (PINK OTC MARKETS: MXIM) introduces the DS4422/DS4424 low-cost, dual-/quad-channel, sink/source current DACs. These I²C-controlled, 7-bit current DACs feature two (DS4422)/four (DS4424) output channels that are specifically designed for power-supply margining and adjustment. Each output channel provides control of a DC-DC power supply by sinking or sourcing current directly into the power supply's feedback node. This control technique allows existing power-supply designs to be margined and adjusted with minimal redesign, thus making the DS4422/DS4424 ideal for servers, video processing cards, and other DC-DC power-supply applications.
The DS4422/DS4424 power-up in a neutral (or zero-current) output condition to minimize system-startup overhead requirements and allow the power-supply feedback resistors to perform in a standard manner. To maximize versatility, these DACs utilize an external resistor to program the full-scale current for each output from 50µA to 200µA with ±6% accuracy. The I²C bus can then be used to linearly set the output currents to any of the 127 sink or 127 source steps up to the maximum value. Two address inputs allow up to four devices or sixteen separate supplies to be controlled on a single I²C bus.
Fully specified over the -40°C to +85°C extended temperature range, the DS4422/DS4424 are available in a tiny, 3mm x 3mm, 14-pin TDFN package. Prices start at $0.53 for the DS4422 and $0.67 for the DS4424 (10,000-up, FOB USA).
Maxim Integrated Products is a publicly traded company that designs, manufactures, and sells over $2 billion of high-performance semiconductor products annually. It was founded over 25 years ago with the mission to deliver innovative analog and mixed-signal engineering solutions that add value to its customers' products. To date, Maxim has developed over 5700 products serving the industrial, communications, consumer, and computing markets. For more information, go to www.maxim-ic.com.
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