LM2940T-5.0

The LM2940T-5.0 is one member of the LM2940 series.The LM2940T-5.0 positive voltage regulator features the ability to source 1Aof output current with a dropout voltage of typically 0.5V and a maximum of 1V 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 3V.The quiescent current with 1A of output current and an input-output differential of 5V is therefore only 30 mA. Higher quiescent currents only exist when the regulator is in the dropout mode(Vin -Vout 3V).

Features of the LM2940T-5.0 are:(1)dropout voltage typically 0.5v @Io =1A; (2)output current in excess of 1A; (3)output voltage trimmed before assembly; (4)reverse battery protection; (5)internal short circuit current limit; (6)mirror image insertion protection; (7)p+ product enhancement tested.Designed also for vehicular applications, the LM2940 and all regulated circuitry are protected from reverse battery installations or 2-battery jumps. During line transients, such as load dump when the input voltage can momentarily exceed the specified maximum operating voltage, the regulator will automatically shut down to protect both the internal circuits and the load. The LM2940 cannot be harmed by temporary mirror-image insertion. Familiar regulator features such as short circuit and thermal overload protection are also provided.

The absolute maximum ratings of the LM2940T-5.0 can be summarized as:(1)LM2940S, T, MP 100 ms:60V; (2)LM2940CS, T 1 ms:45V; (3)internal power dissipation (note 2):internally limited; (4)maximum junction temperature:150°C; (5)storage temperature range:-65°C TJ +150°C; (6)lead temperature, time for wave soldering TO-220 (T) package:260°C, 10s.It is important to note that for most capacitors, ESR is specified only at room temperature. However, the designer must ensure that the ESR will stay inside the limits shown over the entire operating temperature range for the design.A heatsink may be required depending on the maximum power dissipation and maximum ambient temperature of the application.Under all possible operating conditions,the junction temperature must be within the range specified under Absolute Maximum Ratings.