LM2937-3.3 (ACTIVE)

400mA and 500mA Voltage Regulator

400mA and 500mA Voltage Regulator - LM2937-3.3
 

Description

The LM2937-2.5 and LM2937-3.3 are positive voltage regulators capable of supplying up to 500 mA of load current. Both regulators are ideal for converting a common 5-V logic supply, or higher input supply voltage, to the lower 2.5-V and 3.3-V supplies to power very-large-scale integrations (VLSI) ASICs and microcontrollers. 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 5 V.

The LM2937 requires an output bypass capacitor for stability. As with most regulators utilizing a PNP pass transistor, the ESR of this capacitor remains a critical design parameter, but the LM2937-2.5 and LM2937-3.3 include special compensation circuitry that relaxes ESR requirements. The LM2937 is stable for all ESR ratings less than 5 Ω. This allows the use of low ESR chip capacitors.

The regulators are also suited for automotive applications, with built in protection 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

  • Operating Input Voltage Range : 4.75 V to 26 V
  • Fully Specified for Operation Over −40°C
    to 125°C
  • Output Current in Excess of 500 mA (400 mA for
    SOT-223 package)
  • Output Trimmed for 5% Tolerance Under All
    Operating Conditions
  • Wide Output Capacitor ESR Range, 0.01 Ω up
    to 5 Ω
  • Internal Short Circuit and Thermal Overload
    Protection
  • Reverse Battery Input Protection
  • 60-V Input Transient Protection

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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
LM2937-3.3 LM2937 LM2937-2.5 LP2989
0.5    0.5    0.5    0.5   
Fixed Output    Fixed Output    Fixed Output    Fixed Output   
4.75    6    4.75    2.1   
26    26    26    16   
3.3    5
8
10
12
15   
2.5    2.5
2.8
3
3.3
3.8
5   
3.3    5    2.5    2.5   
3.3    15    2.5    5   
2    2    2    0.11   
500    500    500    310   
5    5    3    2   
99    150    75    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   
3DDPAK/TO-263
3TO-220
4SOT-223   
3DDPAK/TO-263
3TO-220
4SOT-223   
8SOIC
8VSSOP
8WSON