The LP2950-N and LP2951-N are micropower voltage regulators with very low quiescent
current (75 μA typical) and very low dropout voltage (typical 40 mV at light loads and 380 mV at
100 mA). They are ideally suited for use in battery-powered systems. Furthermore, the quiescent
current of the device increases only slightly in dropout, prolonging battery life.
Careful design of the LP2950-N/LP2951-N has minimized all contributions to the error
budget. This includes a tight initial tolerance (0.5% typical), extremely good load and line
regulation (0.05% typical) and a very low output voltage temperature coefficient, making the part
useful as a low-power voltage reference.
One such feature is an error flag output which warns of a low
output voltage, often due to falling batteries on the input. It may be used for a power-on reset. A
second feature is the logic-compatible shutdown input which enables the regulator to be switched on
and off. Also, the part may be pin-strapped for a 5-V, 3-V, or 3.3-V output (depending on the
version), or programmed from 1.24 V to 29 V with an external pair of resistors.
The LP2950-N is available in the surface-mount TO-252 package and in the popular 3-pin
TO-92 package for pin-compatibility with older 5-V regulators. The 8-pin LP2951-N is available in
plastic, ceramic dual-in-line, WSON, or metal can packages and offers additional system
For all available packages, see the orderable addendum at the
end of the data sheet.
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