Step-down DC-DC converters are efficient and tiny

21 February 2007 Power Electronics / Power Management

ON Semiconductor has introduced two new high-performing pulse width modulation (PWM), pulse frequency modulation (PFM) and PWM-only DC-DC converters optimised for portable applications. Supplying clean output voltage with very low ripple voltage and fast transient response, it says the NCP1523 and NCP1523B feature a high switching frequency of 3 MHz, enabling the use of a smaller inductor. The devices deliver high power efficiency - up to 93% - thanks to synchronous rectification, and have very fast response times. The NCP1523 features automatic switching PWM/PFM modes, which improves system efficiency at a light load. The PWM-only mode, featured in the NCP1523B, offers an efficient load transient solution and low output voltage ripple. Available in an adjustable output voltage from 0,9 V to 3,3 V, the NCP1523 and NCP1523B come in the tiny 2,1 x 1,1 mm 8-pin Flip-Chip.

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