NCP1421DMR2

The NCP1421DMR2 from ON Semiconductor is a monolithic micropower, high-frequency step-up (boost) switching converter IC. It is specifically designed for battery-operated handheld electronic products requiring up to 600 mA loading.

Key electrical specifications include an adjustable output voltage range from 1.5 V to 5.0 V and an output current capability of up to 600 mA at a 2.5 V input and 3.3 V output. The device operates at a high switching frequency of up to 1.2 MHz, allowing for the use of small, low-profile inductors and output capacitors. It features a low quiescent current of typically 8.5 μA and a true-cutoff function that reduces shutdown current to approximately 50 nA.

Additional features include integrated low-battery detection, logic-controlled shutdown, cycle-by-cycle current limit of 1.5 A, and thermal shutdown protection. The device is available in a compact and low-profile Micro8 package, suitable for space-constrained designs.

Typical applications for the NCP1421DMR2 include personal digital assistants (PDAs), handheld digital audio products, camcorders, digital still cameras, and hand-held instruments. It is also suitable for converting battery cell voltages to higher output voltages, such as from one or two alkaline, NiMH, or NiCd cells to 3.0-5.0 V, or from a single lithium-ion cell to 5.0 V. It can also be used for white LED flash applications in digital cameras.