The LP38859 is a high-current, fast-response regulator which can maintain output voltage
regulation with extremely low input to output voltage drop. Fabricated on a CMOS process, the
device operates from two input voltages: VBIAS provides voltage to drive the
gate of the N-MOS power transistor, while VIN is the input voltage which
supplies power to the load. The use of an external bias rail allows the part to operate from
ultra-low VIN voltages. Unlike bipolar regulators, the CMOS architecture
consumes extremely low quiescent current at any output load current. The use of an N-MOS power
transistor results in wide bandwidth, yet minimum external capacitance is required to maintain loop
The fast transient response of this device makes it suitable for use in powering DSP
microcontroller core voltages and switch-mode power-supply post-regulators. The LP38859 is
available in 5-pin TO-220 and DDPAK/TO-263 packages.
For all available packages, see the orderable addendum at the
end of the data sheet.
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