LM2937-3.3 400mA and 500mA Voltage Regulator | TI.com

LM2937-3.3 (ACTIVE)

400mA and 500mA Voltage Regulator

 

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 Linear regulators (LDO)

 
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
Output Capacitor Type
PSRR @ 100KHz (dB)
Accuracy (%)
Vdo (Typ) (mV)
Iq (Typ) (mA)
Package Size: mm2:W x L (PKG)
LM2937-3.3 LM2937 LM2937-2.5 LP2989
Fixed Output     Fixed Output     Fixed Output     Fixed Output    
0.5     0.5     0.5     0.5    
26     26     26     16    
4.75     6     4.75     2.1    
3.3     15     2.5     5    
3.3     5     2.5     2.5    
3.3     5
8
10
12
15    
2.5     2.5
2.8
3
3.3
3.8
5    
DDPAK/TO-263 | 3
SOT-223 | 4
TO-220 | 3    
DDPAK/TO-263 | 3
SOT-223 | 4
TO-220 | 3    
DDPAK/TO-263 | 3
SOT-223 | 4
TO-220 | 3    
SOIC | 8
VSSOP | 8
WSON | 8    
N/A     N/A     N/A     Enable
Power Good    
1     1     1     1    
-40 to 125
-40 to 85    
-40 to 125
-40 to 85    
-40 to 125
-40 to 85    
-40 to 125    
42     42     42     35    
99     150     75     18    
0.65 | 1ku     0.65 | 1ku     0.65 | 1ku     1.01 | 1ku    
Catalog     Catalog     Catalog     Catalog    
Ceramic     Ceramic     Ceramic     Ceramic    
57     57     57     32    
5     5     3     2    
500     500     500     310    
2     2     2     0.11    
3DDPAK/TO-263: 155 mm2: 15.24 x 10.16 (DDPAK/TO-263 | 3)
4SOT-223: 46 mm2: 7 x 6.5 (SOT-223 | 4)
See datasheet (TO-220)    
3DDPAK/TO-263: 155 mm2: 15.24 x 10.16 (DDPAK/TO-263 | 3)
4SOT-223: 46 mm2: 7 x 6.5 (SOT-223 | 4)
See datasheet (TO-220)    
3DDPAK/TO-263: 155 mm2: 15.24 x 10.16 (DDPAK/TO-263 | 3)
4SOT-223: 46 mm2: 7 x 6.5 (SOT-223 | 4)
See datasheet (TO-220)    
8SOIC: 29 mm2: 6 x 4.9 (SOIC | 8)
8VSSOP: 15 mm2: 4.9 x 3 (VSSOP | 8)
See datasheet (WSON)