feature I2C-controllable feedback voltages, as shown in Figure 1. The output voltages of these Type A regulators are set by a combination of ex-ternal programming resistors and I2C-adjustable feedback voltages16 settings from 425mV to 800mV.The Type B regulators (R600B and R400B) do not require integrated on-chip. The values of the internal feedback resistors are adjusted through the I2C port, resulting in 128 possible output voltages from 600mV to 3.775V in 25mV increments.Inrush current limiting is provided by soft-start circuitry in all four regulators, as well as short-circuit protection and switch node slew rate limiting to reduce EMI.Power Saving Operating ModesThe LTC3562s step-down regulators offer four selectable modes of operation, which make it possible to balance low noise against ef ciency. The four operating modes of the LTC3562 are shown in Figure 2. At moderate to heavy loads, the constant frequency pulse-skipping mode provides the best output switching noise solution. Compact I2C-Controllable Quad Synchronous Step-Dow Design Note