Features: Incorporates "Silent Switcher™" technology to deliver
very low output voltage ripple (typically 5mV)
Guaranteed full load start-up and operation at
1.0Vinput 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
SpecificationsVBOOST.......................................................................7V
Voltage on Any Other Pin...GND 0.3V to V BOOST+0.3V
Peak Switch Current (IPEAK).......................................1A
Average Switch Current (IAVG).............................500mA
LDO Output Current.............................................250mA
Junction Temperature...........................................150°C
Temperature Range
ML4890CS-X..............................................0°C to +70°C
ML4890ES-X..........................................20°C to +70°C
VIN Operating Range
ML4890CS-X....................................................1.0V to 6V
ML4890ES-X.....................................................1.1V to 6V
DescriptionThe 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.
The ML4890 is designed to convert single or multiple cell battery inputs to regulated output voltages for integrated circuits and is ideal for pocommunications
equipment that cannot tolerate the output voltage ripple normally associated with switching regulators.
An integrated synchronous rectifier ML4890 eliminates the need for an external Schottky diode and provides a lower forward voltage drop, resulting in higher conversion efficiency.
ML4890 Data Sheet
