LM2937 - 500 mA Low Dropout Regulator
Datasheet Packaging Samples & Pricing Reliability Knowledge Base

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 0.5V at full rated load current
•Wide output capacitor ESR range, up to 3
•Internal short circuit and thermal overload protection
•Reverse battery protection
•60V input transient protection
•Mirror image insertion protection

General Description

The LM2937 is a positive voltage regulator capable of supplying up to 500 mA of load current. More...


  Typical Application
click for larger image


ParametersValues
Output Current 500 mA
Output Min 12, 15, 8, 10, 5 Volt
Input Max Voltage 26 Volt
Dropout Voltage 0.5 Volt
Adjustable Output No
Quiescent Current 2 mA
On/Off Pin No
Error Flag No
RegType LDO
Temperature Min -40 deg C
Temperature Max 125 deg C
Output Max 12, 15, 8, 10, 5 Volt
Output Voltage 12, 15, 8, 10, 5 Volt


Typical Performance

click for larger image


  Also Recommended
LP2989▲Better Performance, Lower Voltage
LP38691▲Higher Load Capability, Lower Supply Current, Stable With Lower ESR Ceramic Output Cap
LP38693▲Higher Load Capability, Lower Supply Current, Stable With Lower ESR Ceramic Output Cap
LP3878-ADJ▲Higher Load Capability, Lower Supply Current, Stable With Lower ESR Ceramic Output Cap
LM2937-2.5▲2.5V Output Voltage
LM2937-3.3▲3.3V Output Voltage
Connection Diagram
click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM2937 500 mA Low Dropout Regulator 746
Kbytes		 29-Aug-05 Download
LM2937 500 mA Low Dropout Regulator (Japanese)
 520 Kbytes   Download

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Package Availability, Models, Samples & Pricing
Part NumberPackageFactory Lead TimeModelsSamples &
Electronic
Orders		Budgetary PricingStd
Pack
Size		Package
Marking
Format
TypePinsSpec.MSL
Rating		Peak
Reflow		RoHS
Report		CAD
Symbols		WeeksQtyQty$US each
LM2937IMP-15SOT-2234NOPB
STD		1
1		260
260		RoHS Download Lifetime buyN/A
 
Buy Now 		1K+$0.69reel
of
1000		XYTT
L75B
8 weeks2000
LM2937IMP-10SOT-2234NOPB
STD		1
1		260
260		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.69reel
of
1000		XYTT
L73B
8 weeks2000
LM2937IMP-12SOT-2234NOPB1260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.69reel
of
1000		XYTT
L74B
8 weeks7500
LM2937IMP-5.0SOT-2234NOPB
STD		1
1		260
260		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.69reel
of
1000		XYTT
L71B
6 weeks2000
LM2937IMP-8.0SOT-2234NOPB1260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.69reel
of
1000		XYTT
L72B
6 weeks15000
LM2937IMPX-10SOT-2234NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$0.69reel
of
2000		XYTT
L73B
8 weeks7500
LM2937IMPX-12SOT-2234NOPB
STD		1
1		260
260		RoHS Download Full productionN/A
 
Buy Now 		1K+$0.69reel
of
2000		XYTT
L74B
8 weeks2500
LM2937IMPX-15SOT-2234NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$0.69reel
of
2000		XYTT
L75B
8 weeks3000
LM2937IMPX-5.0SOT-2234NOPB
STD		1
1		260
260		RoHS Download Full productionN/A
 
Buy Now 		1K+$0.69reel
of
2000		XYTT
L71B
8 weeks7500
LM2937IMPX-8.0SOT-2234NOPB
STD		1
1		260
260		RoHS Download Full productionN/A
 
Buy Now 		1K+$0.69reel
of
2000		XYTT
L72B
8 weeks20000
LM2937ET-10TO-2203NOPB1NARoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.74rail
of
45		NSUZXYTTE#
LM2937ET
-10
8 weeks2000
LM2937ET-12TO-2203NOPB
STD		1
1		NA
NA		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.74rail
of
45		NSUZXYTTE#
LM2937ET
-12
8 weeks1000
LM2937ET-15TO-2203NOPB
STD		1
1		NA
NA		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.74rail
of
45		NSUZXYTTE#
LM2937ET
-15
8 weeks500
LM2937ET-5.0TO-2203NOPB
STD		1
1		NA
NA		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.74rail
of
45		NSUZXYTTE#
LM2937ET
-5.0
12 weeks5000
LM2937ET-8.0TO-2203NOPB
STD		1
1		NA
NA		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.74rail
of
45		NSUZXYTTE#
LM2937ET
-8.0
8 weeks7500
LM2937ES-10TO-2633NOPB
STD		3
3		245
235		RoHS Download Full productionN/A
 
Buy Now 		1K+$0.88rail
of
45		NSUZXYTTE#
LM2937ES
-10
8 weeks2000
LM2937ES-12TO-2633NOPB
STD		3
3		245
235		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.88rail
of
45		NSUZXYTTE#
LM2937ES
-12
8 weeks1000
LM2937ES-15TO-2633NOPB
STD		3
3		245
235		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.88rail
of
45		NSUZXYTTE#
LM2937ES
-15
8 weeks1000
LM2937ES-5.0TO-2633NOPB
STD		3
3		245
235		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.88rail
of
45		NSUZXYTTE#
LM2937ES
-5.0
8 weeks2000
LM2937ES-8.0TO-2633NOPB3245RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.88rail
of
45		NSUZXYTTE#
LM2937ES
-8.0
8 weeks1000
LM2937ESX-10TO-2633NOPB
STD		3
3		245
235		RoHS Download Lifetime buyN/A
 
Buy Now 		1K+$0.88reel
of
500		NSUZXYTTE#
LM2937ES
-10
8 weeks2000
LM2937ESX-12TO-2633NOPB
STD		3
3		245
235		RoHS Download Full productionN/A
 
Buy Now 		1K+$0.88reel
of
500		NSUZXYTTE#
LM2937ES
-12
8 weeks2000
LM2937ESX-15TO-2633NOPB3245RoHS Download Full productionN/A
 
Buy Now 		1K+$0.88reel
of
500		NSUZXYTTE#
LM2937ES
-15
8 weeks10000
LM2937ESX-5.0TO-2633NOPB
STD		3
3		245
235		RoHS Download Full productionN/A
 
Buy Now 		1K+$0.88reel
of
500		NSUZXYTTE#
LM2937ES
-5.0
8 weeks2500
LM2937ESX-8.0TO-2633NOPB
STD		3
3		245
235		RoHS Download Full productionN/A
 
Buy Now 		1K+$0.88reel
of
500		NSUZXYTTE#
LM2937ES
-8.0
8 weeks2000
LM2937E-5.0 MWCWaferFull productionN/A
  CALLwafer jar
of
N/A		-
N/AN/A

Obsolete Versions

Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
LM2937ESX-10
MIC2937
NATIONAL SEMICONDUCTOR
01 Dec 2009
LM2937ESX-2.5
NONE
NATIONAL SEMICONDUCTOR
01 Dec 2009
LM2937IMP-15
LM2937IMPX-15
NATIONAL SEMICONDUCTOR
01 Dec 2009

General 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 0.5V (1V guaranteed 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 3V.

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 LM2937 is stable for all ESR below 3. 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 +60V/-50V load dump transients. Familiar regulator features such as short circuit and thermal shutdown protection are also built in.

Reliability Metrics

Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM2937E-5.0 MWCSLM04404600353250011002356520
LM2937ES-10SLM04404600353250011002356520
LM2937ES-12SLM04404600353250011002356520
LM2937ES-15SLM04404600353250011002356520
LM2937ES-5.0SLM04404600353250011002356520
LM2937ES-8.0SLM04404600353250011002356520
LM2937ESX-10SLM04404600353250011002356520
LM2937ESX-12SLM04404600353250011002356520
LM2937ESX-15SLM04404600353250011002356520
LM2937ESX-5.0SLM04404600353250011002356520
LM2937ESX-8.0SLM04404600353250011002356520
LM2937ET-10SLM04404600353250011002356520
LM2937ET-12SLM04404600353250011002356520
LM2937ET-15SLM04404600353250011002356520
LM2937ET-5.0SLM04404600353250011002356520
LM2937ET-8.0SLM04404600353250011002356520
LM2937IMP-10SLM04404600353250011002356520
LM2937IMP-12SLM04404600353250011002356520
LM2937IMP-15SLM04404600353250011002356520
LM2937IMP-5.0SLM04404600353250011002356520
LM2937IMP-8.0SLM04404600353250011002356520
LM2937IMPX-10SLM04404600353250011002356520
LM2937IMPX-12SLM04404600353250011002356520
LM2937IMPX-15SLM04404600353250011002356520
LM2937IMPX-5.0SLM04404600353250011002356520
LM2937IMPX-8.0SLM04404600353250011002356520

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.


Application Notes

TitleSize in Kbytes Date Click link below to Download
AN-1836: Application Note 1836 LMH1251 Evaluation Board Users Guide v2.0 2267
Kbytes		 24-Jun-08 Download

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[Information as of 4-Nov-2009]