The NCP1523 is a 3 MHz, 600mA, high efficiency, adjustable output voltage step-down converter, optimized for portable applications powered from a 1-cell Li-ion or 3 cell Alkaline/NiCd/NiMH battery. The device is available in an adjustable output voltage from 0.9V to 3.3V. 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.
The NCP1523 is a high‑efficiency step‑down PWM DC‑DC converter optimized for portable applications powered from 1‑cell Li‑ion or 3‑cell alkaline/NiCd/NiMH batteries. It offers an adjustable output voltage from 0.9 V to 3.3 V, synchronous rectification, soft‑start, and built‑in protection features.
The device is available in two modes: automatic PFM/PWM (NCP1523FCT2G) for light‑load efficiency and PWM‑only (NCP1523BFCT2G) for high‑efficiency load‑transient performance. The datasheet provides pin definitions, maximum ratings, electrical characteristics, typical application circuits, output‑capacitor recommendations, and package dimensions.