Phoenix, Ariz.—ON Semiconductor's NCP1423, the latest member of the company's portfolio of micropower IC step-up devices, is a DC/DC switching regulator that boosts the voltage from a single nickel metal hydride (NiMH) or nickel cadmium (NiCd) cell to 1.8 volts, or two cells to 3.3 volts for portable electronic products. It delivers up to 400 milliamps for such applications as wireless optical mice and keyboards, wireless headsets, audio players, PDAs and other hand-held devices.
The NCP1423 integrates synchronous rectification to improve efficiency and to eliminate the external Schottky diode. Its high switching frequency (up to 600 kHz) allows the use of low profile, small-sized inductors and output capacitors. When the device is disabled, the internal conduction path from the device's LX or BAT pin to the OUT pin is fully blocked, and the OUT pin is isolated from the battery. This true-cutoff function minimizes the shutdown current. A "ring-killer" feature has also been integrated to eliminate the high-frequency ringing in discontinuous conduction mode.
Additional features such as a low-battery detect, cycle-by-cycle current limit, and thermal shutdown provide additional power management and protection. With all these functions enabled, the quiescent supply current is typically only 9 microamps.
The NCP1423DMR2 is available in a Micro-10 package and is priced at 95 cents per unit in 10k-unit quantities. The device's data sheet is available at www.onsemi.com/pub/Collateral/NCP1423-D.PDF
ON Semiconductor, 1-602-244-6600, www.onsemi.com