5-Bit, 4CH DAC for Power Supplies

You can easily add margining capability (digital adjustment of the output voltage) to a DC/DC converter by adding 4-channel, I2C-adjustable current DAC (DS4404) at the converter's feedback input. Because each DAC output is 0mA at power up, the extra circuitry is transparent to the system until a command is written via the I2C bus