GENERAL DESCRIPTION

The ML4890 is a high efficiency, PFM (Pulse Frequency Modulation), boost switching regulator connected in series with an integrated LDO (Low Dropout Regulator) that incorporates “Silent Switcher™” technology. This technique incorporates a patented tracking scheme to minimize the voltage drop across the LDO and increase the total efficiency of the regulator beyond that which can be obtained by using a discrete external LDO regulator.

FEATURES

■ Incorporates “Silent Switcher™” technology to deliver very low output voltage ripple (typically 5mV)

■ Guaranteed full load start-up and operation at 1.0V input and low operating quiescent current (<100µA) for extended battery life

■ Pulse Frequency Modulation and internal synchronous rectification for high efficiency

■ Minimum external components

■ Low ON resistance internal switching MOSFETs

■ 5V, 3.3V, and 3V output versions