LM2937

Fully specified for operation over -40 to +125

Output current in excess of 500 mA
Output trimmed for 5% tolerance under all operating conditions
Typical dropout voltage of 0.5V at full rated load current
Wide output capacitor ESR range, up to 3

Internal short circuit and thermal overload protection
Reverse battery protection
60V input transient protection
Mirror image insertion protection

Input Voltage
Continuous 26V
Transient (t 100 ms) 60V
Internal Power Dissipation (Note 2) Internally Limited
Maximum Junction Temperature 150

Storage Temperature Range-65 to +150
TO-220 (10 seconds) 260

TO-263 (10 seconds) 230
SOT-223 (Vapor Phase, 60 seconds)215
SOT-223 (Infared, 15 seconds) 220

ESD Susceptibility (Note 3) 2 kV

The LM2937 is a positive voltage regulator capable of supplying up to 500 mA of load current. The use of a PNP power transistor provides a low dropout voltage characteristic. With a load current of 500 mA the minimum input to output voltage differential required for the output to remain in regulation is typically 0.5V (1V guaranteed maximum over the full operating temperature range). Special circuitry has been incorporated to minimize the quiescent current to typically only 10 mA with a full 500 mA load current when the input to output voltage differential is greater than 3V.

The LM2937 requires an output bypass capacitor for stability. As with most low dropout regulators, the ESR of this capacitor remains a critical design parameter, but the LM2937 includes special compensation circuitry that relaxes ESR requirements. The LM2937 is stable for all ESR below 3. This allows the use of low ESR chip capacitors.

Ideally suited for automotive applications, the LM2937 will protect itself and any load circuitry from reverse battery connections, two-battery jumps and up to +60V/-50V load dump transients. Familiar regulator features such as short circuit and thermal shutdown protection are also built in.

Reliability Metrics

Application Notes