LM1771,pdf datasheet (Precisio

The LM1771 is an efficient synchronous buck switching controller

with a precision enable requiring no external compensaTIon.

The constant on-TIme control scheme provides a

simple design free of compensaTIon components, allowing

minimal component count and board space. The precision

enable pin allows flexibility in sequencing mulTIple rails and

setting UVLO. The LM1771 also incorporates a unique input

feed-forward to maintain a constant frequency independent

of the input voltage. The LM1771 is optimized for a low

voltage input range of 2.8V to 5.5V and can provide an

adjustable output as low as 0.8V. Driving an external high

side PFET and low side NFET it can provide efficiencies as

high as 95%.