The S3REGC118T22FDX is a capless regulator circuit which has been designed to provide 0.65-1.5V with a load current of up to 1mA. The output voltage is programmable in 100mV steps. No external load capacitor is required and the architecture has been designed so that it is stable without such an external load capacitor, yet yielding a small area while consuming low ground current and allowing low-drop operation.
The S3REGC118T22FDX features an automatic feedback sensing option to maintain a constant regulated output voltage level. It has been designed to provide a stable output in both low-drop and high-drop operation, while maintaining minimum ripple on supply lines in the presence of large load current spikes inherent with switching loads, e.g. pipeline ADCs. The S3REGC118T22FDX uses 1.8V thick oxide devices from a standard 22nm FDX process. The circuit can be scaled for a range of load currents and capacitances.
As no external capacitor is needed, the S3REGC118T22FDX capless regulator can provide savings in terms of package pins and discrete capacitors, allowing reduced BOM costs and higher system reliability. It can be particularly useful if the IC design is pad limited. The S3REGC118T22FDX is readily portable to any similar manufacturing process or can be customised for specific customer requirements and it is designed with Deep-Nwell process option for noise immunity.