TO-263

The LM2940 positive-voltage regulator features the
ability to source 1 A of output current, with a typical
dropout voltage of 0.385 V and a maximum of
800 mV over the entire temperature range.
Furthermore, a quiescent current reduction circuit
has been included, which reduces the ground current
when the differential between the input voltage and
the output voltage exceeds approximately 3 V. The
quiescent current with 1 A of output current and an
input-output differential of 5 V is, therefore, only
30 mA. Higher quiescent currents only exist when
the regulator is in the dropout mode (VI – VO ≤ 3 V).
Also designed for vehicular applications, the LM2940
and all regulated circuitry are protected from reverse
battery installations or two-battery jumps. During line
transients, such as load dump when the input
voltage can momentarily exceed the specified
maximum operating voltage, the regulator
automatically shuts down to protect both the internal
circuits and the load. The LM2940 is not harmed by
temporary mirror-image insertion. Familiar regulator
features, such as short-circuit and thermal-overload
protection, also are provided.