LM2937ESX-3.3

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 0.5 V (1-V ensured 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 3 V.

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 device is stable for all ESR below 3 Ω. 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 60-V/−50-V load dump transients. Familiar regulator features such as short circuit and thermal shutdown protection are also built in.

Key Features

• Fully Specified for Operation Over −40°C
  to 125°C
• Output Current in Excess of 500 mA
• Output Trimmed for 5% Tolerance Under all Operating
  Conditions
• Typical Dropout Voltage of 0.5 V at Full Rated Load
  Current
• Wide Output Capacitor ESR Range, up to 3 Ω
• Internal Short Circuit and Thermal Overload Protection
• Reverse Battery Protection
• 60-V Input Transient Protection
• Mirror Image Insertion Protection