The TPS62097 synchronous step-down converter is based on the iDCS-Control (Industrial Direct Control with Seamless transition into Power Save Mode) topology. The control topology not only keeps the advantages of DCS-Control, but also provides other features:

• Forced PWM mode over the whole load range
• Selectable PWM switching frequency
• 1% output voltage accuracy
• Output voltage sequencing and tracking

The iDCS-Control topology operates in PWM (Pulse Width Modulation) mode for medium to heavy load conditions and in Power Save Mode (PSM) at light load conditions. Or it forces the device in fixed frequency PWM mode only operation for the whole load range.

In PWM mode, the device operates with a predictive on-time switching pulse. A quasi-fixed switching frequency over the input and output voltage range is achieved by using an input and output voltage feedforward to set the on-time, as shown in Table 8-1. The converter enters Power Save Mode, reducing the switching frequency and minimizing current consumption, to achieve high efficiency over the entire load current range. Since iDCS-Control supports both operation modes within a single building block, the transition from PWM mode to Power Save Mode is seamless and without effects on the output voltage.