500 mA Low Dropout Regulator - LM2937

LM2937 (ACTIVE)

500 mA Low Dropout Regulator

 

Description

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.

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

View more

Parametrics Compare all products in Single Channel LDO

 
Iout (Max) (A)
Output Options
Vin (Min) (V)
Vin (Max) (V)
Fixed Output Options (V)
Vout (Min) (V)
Vout (Max) (V)
Iq (Typ) (mA)
Vdo (Typ) (mV)
Accuracy (%)
Noise (uVrms)
PSRR @ 100KHz (dB)
Output Capacitor Type
Rating
Operating Temperature Range (C)
Pin/Package
LM2937 LM2937-2.5 LM2937-3.3 LP2989
0.5    0.5    0.5    0.5   
Fixed Output    Fixed Output    Fixed Output    Fixed Output   
0    4.75    4.75    2.1   
26    26    26    16   
5
8
10
12
15   
2.5    3.3    2.5
2.8
3
3.3
3.8
5   
5    2.5    3.3    2.5   
15    2.5    3.3    5   
2    2    2    0.11   
500    500    500    310   
5    4.8    4.5    2.5   
150    75    99    18   
57    57    57    32   
Ceramic    Ceramic    Ceramic    Ceramic   
Catalog    Catalog    Catalog    Catalog   
-40 to 125
-40 to 85   
-40 to 125
-40 to 85   
-40 to 125
-40 to 85   
-40 to 125   
3DDPAK/TO-263
3TO-220
4SOT-223   
3TO-220
4SOT-223
3DDPAK/TO-263   
3DDPAK/TO-263
3TO-220
4SOT-223   
8SOIC
8VSSOP
8WSON