The LM2931-N positive voltage regulator features a very low quiescent current of 1mA or
less when supplying 10mA loads. This unique characteristic and the extremely low input-output
differential required for proper regulation (0.2V for output currents of 10mA) make the LM2931-N
the ideal regulator for standby power systems. Applications include memory standby circuits, CMOS
and other low power processor power supplies as well as systems demanding as much as 100mA of
Designed originally for automotive applications, the LM2931-N and all regulated circuitry
are protected from reverse battery installations or 2 battery jumps. During line transients, such
as a load dump (60V) when the input voltage to the regulator can momentarily exceed the specified
maximum operating voltage, the regulator will automatically shut down to protect both internal
circuits and the load. The LM2931-N cannot be harmed by temporary mirror-image insertion. Familiar
regulator features such as short circuit and thermal overload protection are also provided.
The LM2931-N family includes a fixed 5V output (±3.8% tolerance for A grade) or an
adjustable output with ON/OFF pin. Both versions are available in a TO-220 power package,
DDPAK/TO-263 surface mount package, and an 8-lead SOIC package. The fixed output version is also
available in the TO-92 plastic package.
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