RT8101/RT8101A pdf datasheet (

The RT8101/A are DC/DC synchronous buck PWM
controllers with embedded driver support up to 12V+12V
boot-strapped voltage for high efficiency power driving. The
parts are with full functions of voltage regulation, power
monitoring and protection into a single small footprint
packages SOP-8 and SOP-8 (Exposed Pad).
The RT8101/A apply a high-gain voltage mode PWM control
for simple application design. An internal 0.8V reference
allows the output voltage to be precisely regulated to low
voltage requirement. The parts are proposed with two type
including RT8101 and RT8101A with fixed operating
frequency of 300kHz and 600kHz respectively. Based on
the features that RT8101/A offered, the parts provide an
optimum solution between efficiency, total B.O.M. count,
and cost.