general description
the pt1281 is a high efficiency monolithic current mode synchronous buck regulator with a constant operation frequency. a
main switch and a synchronous switch are integrated in pt1281, the device has high efficiency and no external schottky
diode needed. supply current is 300ua during operation and drops to ≤1μa in shutdown. the 2.5v to 5.5v input voltage
range makes the pt1281 ideally suited for single li-ion battery-powered applications. 100% duty cycle provides low dropout
operation, extending battery life in portable systems. automatic skip cycle operation mode at light loads provides very low
output ripple for noise sensitive applications. internal 1.5mhz switching frequency allowing the use of small surface mount
inductors and capacitors. ultra low output voltages are easily available with the 0.6v feedback reference voltage.
the pt1281 is offered in a low profile sot package and is available in an adjustable version and fixed output voltages
versions from 0.6v to 1.8v.