RICOH Electronic Devices developed a new LDO (Low Dropout) voltage regulator, RP118, with 100 mA output current.
The advantage of this LDO is the very low quiescent current (200nA typical).
The low quiescent current of LDO is one of the key features to keep the long battery life especially for the IoT, wearable, or energy harvesting devices.
The descriptions from the website.
"RP118 is a voltage regulator featuring 0.2 µA ultra-low supply current. This device is ideal for a wearable equipment and IoT which require a long service life and a miniaturization of a battery.
A small package is available to achieve the smallest possible footprint solution on boards where area is limited."
The chip only has 4 to 5 pins depending on the package options.
3 packages, WLCSP-4-P8 (0.64 mm × 0.64 mm), DFN(PLP)1010-4 (1.0 mm × 1.0 mm), and SOT-23-5 (2.9 mm × 2.8 mm), are available.
WLCSP package is very small and great for the design with the limited PCB space.
The reference circuit is also simple enough with the recommended 1.0 uF ceramic capacitors each input and output power pins.
You can buy the samples online, but I do not think evaluation board is available.
For the quick prototype, it is better to use SOT-23-5 package so that you can easily solder it by hand.
The target application is listed in the website as well.
I think it would be nice to see this kind of low quiescent current LDOs in the application specific reference designs if the price is reasonable.