The TPS6280x is a high frequency synchronous step-down converter with ultra-low quiescent current consumption. Using TI's DCS-Control topology, the device extends the high efficiency operation area down to microamperes of load current during power save mode operation. TI's DCS-Control (Direct Control with Seamless Transition into power save mode) is an advanced regulation topology, which combines the advantages of hysteretic and voltage mode control. Characteristics of DCS-Control are excellent AC load regulation and transient response, low output ripple voltage, and a seamless transition between PFM and PWM mode operation. DCS-Control includes an AC loop, which senses the output voltage (VOS pin) and directly feeds the information to a fast comparator stage. This comparator sets the switching frequency, which is constant for steady state operating conditions, and provides immediate response to dynamic load changes. In order to achieve accurate DC load regulation, a voltage feedback loop is used. The internally compensated regulation network achieves fast and stable operation with small external components and low-ESR capacitors.