LM2931-N 100-mA, 26-V, high-PSRR, low-dropout voltage regulator | TI.com

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

100-mA, 26-V, high-PSRR, low-dropout voltage regulator - LM2931-N


The LM2931-N positive voltage regulator features a very low quiescent current of 1mA or less when supplying 10mA loads. This unique characteristic and the extremely low input-output differential required for proper regulation (0.2V for output currents of 10mA) make the LM2931-N the ideal regulator for standby power systems. Applications include memory standby circuits, CMOS and other low power processor power supplies as well as systems demanding as much as 100mA of output current.

Designed originally for automotive applications, the LM2931-N and all regulated circuitry are protected from reverse battery installations or 2 battery jumps. During line transients, such as a load dump (60V) when the input voltage to the regulator can momentarily exceed the specified maximum operating voltage, the regulator will automatically shut down to protect both internal circuits and the load. The LM2931-N cannot be harmed by temporary mirror-image insertion. Familiar regulator features such as short circuit and thermal overload protection are also provided.

The LM2931-N family includes a fixed 5V output (±3.8% tolerance for A grade) or an adjustable output with ON/OFF pin. Both versions are available in a TO-220 power package, DDPAK/TO-263 surface mount package, and an 8-lead SOIC package. The fixed output version is also available in the TO-92 plastic package.


  • Very Low Quiescent Current
  • Output Current in Excess of 100 mA
  • Input-output Differential Less than 0.6V
  • Reverse Battery Protection
  • 60V Load Dump Protection
  • −50V Reverse Transient Protection
  • Short Circuit Protection
  • Internal Thermal Overload Protection
  • Mirror-image Insertion Protection
  • Available in TO-220, TO-92, TO-263, or SOIC-8 Packages
  • Available as Adjustable with TTL Compatible Switch

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Part number Order Output options Iout (Max) (A) Vin (Max) (V) Vin (Min) (V) Vout (Max) (V) Vout (Min) (V) Fixed output options (V) Package Group Features Regulated outputs (#) Operating temperature range (C) Thermal resistance θJA (°C/W) Noise (uVrms) Approx. price (US$) Rating PSRR @ 100 KHz (dB) Accuracy (%) Dropout voltage (Vdo) (Typ) (mV) Iq (Typ) (mA) Package size: mm2:W x L (PKG)
LM2931-N Order now Adjustable Output
Fixed Output    
0.1     26     4     24     3     5     DDPAK/TO-263 | 3
DDPAK/TO-263 | 5
SOIC | 8
TO-220 | 3
TO-220 | 5
TO-92 | 3    
    1     -40 to 85     32     120     0.21 | 1ku     Catalog     53     5     300     0.4     3DDPAK/TO-263: 155 mm2: 15.24 x 10.16 (DDPAK/TO-263 | 3)
5DDPAK/TO-263: 155 mm2: 15.24 x 10.16 (DDPAK/TO-263 | 5)
8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)
3TO-220: 47 mm2: 4.58 x 10.16 (TO-220 | 3)
5TO-220: 86 mm2: 8.51 x 10.16 (TO-220 | 5)
3TO-92: 19 mm2: 3.68 x 5.2 (TO-92 | 3)    
LM3480 Order now Fixed Output     0.1     30     4     15     3.3     3.3
SOT-23 | 3         1     -40 to 125     270     100     0.30 | 1ku     Catalog     45     3.5     900     2     3SOT-23: 7 mm2: 2.37 x 2.92 (SOT-23 | 3)