NCP1521
1.
5 MHz, 600 mA, High-Ef ficiency, Low Quiescent Current, Adjustable Output
Voltage Step-Down Converter
The NCP1521 step- down PWM DC- DC converter is optimized for portable applications powered from one cell Li- ion or three cell Alkaline/NiCd/NiMH batteries.
The device is available in an adjustable output
voltage from 0.
9 V to 3.
3 V.
It uses synchronous rectification to increase efficiency and reduce external part count.
The device also has a built- in 1.
5 MHz (nominal) oscillator which reduces component size by allowing a small inductor and
capacitors.
Automatic switching PWM/PFM mode offers improved system efficiency.
Finally, it includes an integrated soft-start, cycle-by-cycle...