LM2937

ACTIVE

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

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Data sheet

document-pdfAcrobat LM2937 500-mA Low Dropout Regulator datasheet (Rev. F) PDF | HTML

LM2937

ACTIVE

Data sheet

Order now

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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