The NCP1523 step-down PWM DC-DC converter is optimized for portable applications powered from 1-cell Li-ion or 3 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 3 MHz (nominal) oscillator which reduces component size by allowing use of a small inductor and capacitors. NCP1523 is available in automatic switching PWM/PFM (NCP1523FCT2G) improving system efficiency and in PWM mode only (NCP1523BFCT2G) offering a very efficient load transient solution. Additional features include integrated soft-start, cycle-by-cycle current limiting and thermal shutdown protection. The NCP1523 is available in a space saving, 8 pin chip scale package.
Features
Benefits
Up to 93% Efficiency, 60 uA Quiescent Current, Shutdown Current Consumption of 0.3 A
Extends battery life and 'play-time'
Auto-switching between PWM and PFM mode at light load conditions (NCP1523FCT2G)
Low power consumption at light loading
PWM mode operation (NCP1523BFCT2G)
Very efficient load transient solution, low output voltage ripple at light load