LM2937

ACTIVE

500-mA, 26-V, high-PSRR, low-dropout voltage regulator

Product details

Output options Fixed Output Iout (max) (A) 0.5 Vin (max) (V) 26 Vin (min) (V) 6 Vout (max) (V) 15 Vout (min) (V) 5 Fixed output options (V) 2.5, 3.3, 5, 8, 10, 12, 15 Rating Catalog Noise (µVrms) 150 PSRR at 100 KHz (dB) 57 Iq (typ) (mA) 2 Thermal resistance θJA (°C/W) 42, 58.4, 78 Load capacitance (min) (µF) 10 Regulated outputs (#) 1 Accuracy (%) 5 Dropout voltage (Vdo) (typ) (mV) 500 Operating temperature range (°C) -40 to 125
Output options Fixed Output Iout (max) (A) 0.5 Vin (max) (V) 26 Vin (min) (V) 6 Vout (max) (V) 15 Vout (min) (V) 5 Fixed output options (V) 2.5, 3.3, 5, 8, 10, 12, 15 Rating Catalog Noise (µVrms) 150 PSRR at 100 KHz (dB) 57 Iq (typ) (mA) 2 Thermal resistance θJA (°C/W) 42, 58.4, 78 Load capacitance (min) (µF) 10 Regulated outputs (#) 1 Accuracy (%) 5 Dropout voltage (Vdo) (typ) (mV) 500 Operating temperature range (°C) -40 to 125
SOT-223 (DCY) 4 45.5 mm² 6.5 x 7 TO-220 (NDE) 3 46.5328 mm² 10.16 x 4.58 TO-263 (KTT) 3 154.8384 mm² 10.16 x 15.24
  • 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
  • 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

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.

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.

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* Data sheet LM2937 500-mA Low Dropout Regulator datasheet (Rev. F) PDF | HTML 02 Jul 2014

Design & development

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Package Pins CAD symbols, footprints & 3D models
SOT-223 (DCY) 4 Ultra Librarian
TO-220 (NDE) 3 Ultra Librarian
TO-263 (KTT) 3 Ultra Librarian

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