Dual-Channel, Sink/Source Current DAC for Power-Supply Adjustments
Maxim Integrated Products introduced its DS4412 dual-channel, sink/source current DAC. This I2C-controlled, 4-bit current DAC features two output channels that are explicitly designed for power-supply margin testing 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 DC/DC power-supply control allows existing power-supply designs to be margined and adjusted with minimal redesign, thus making the DS4412 appropriate for servers, video-processing cards, and other DC/DC power-supply applications. The DAC powers up in a neutral (or zero-current) output condition to minimize system-startup overhead requirements. The full-scale output currents are set between 500 µA and 2 mA using one external resistor for each channel. Through the I2C bus, the output currents can then be set to any of the 15 linear sink or 15 linear source steps up to the maximum full-scale value. The DS4412 is fully specified over the -40°C to +85°C industrial temperature range, and is available in an eight-pin microSOP. Pricing begins at $0.45 (10,000-up).
Maxim Integrated Products