LM2937-3.3 - 400mA and 500mA Voltage 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 (400mA for SOT-223 package)
•	Output trimmed for 5% tolerance under all operating conditions
•	Wide output capacitor ESR range, 0.01 up to 5
•	Internal short circuit and thermal overload protection
•	Reverse battery protection
•	60V input transient protection
•	Mirror image insertion protection

General Description

The LM2937-2.5 and LM2937-3.3 are positive voltage regulators capable of supplying up to 500 mA of load current. More...

Typical Application

click for larger image

Parameters Values

Output Current 500, 400 mA

Output Min 3.3 Volt

Input Min Voltage 4.75 Volt

Input Max Voltage 26 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, 85 deg C

Output Max 3.3 Volt

Output Voltage 3.3 Volt

Typical Performance

*click for larger image

Output Voltage vs Temperature, LM2937-3.3

Also Recommended

LM2937▲	Different Output Voltages
LP2989▲	Better Performance, Lower Voltage
LM2937-2.5▲	2.5V Output Voltage

Connection Diagram

click for larger image

Datasheet

RoHS Compliance Information	Size in Kbytes	Date
LM2937-2.5, LM2937-3.3 400mA and 500mA Voltage Regulators	735 Kbytes	29-Aug-05	Download

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Package Availability, Models, Samples & Pricing

Part Number

Package

Factory Lead Time

Models

Samples &
Electronic
Orders

Budgetary Pricing

Std
Pack
Size

Package
Marking
Format

Type

Pins

Spec.

MSL
Rating

Peak
Reflow

RoHS
Report

CAD
Symbols

Weeks

Qty

$US each

LM2937IMP-3.3

SOT-223

NOPB
STD

1
1

260
260

RoHS

N/A

Full production

N/A

1K+

$0.69

reel
of
1000

XYTT
L69B

6 weeks

2000

LM2937IMPX-3.3

SOT-223

NOPB
STD

1
1

260
260

RoHS

N/A

Full production

N/A

1K+

$0.69

reel
of
2000

XYTT
L69B

8 weeks

3000

LM2937ET-3.3

TO-220

NOPB
STD

1
1

NA
NA

RoHS

N/A

Full production

N/A

1K+

$0.74

rail
of
45

NSUZXYTTE#
LM2937ET
-3.3

8 weeks

1000

LM2937ES-3.3

TO-263

NOPB
STD

3
3

245
235

RoHS

N/A

Full production

N/A

1K+

$0.88

rail
of
45

NSUZXYTTE#
LM2937ES
-3.3

12 weeks

2500

LM2937ESX-3.3

TO-263

NOPB
STD

3
3

245
235

RoHS

N/A

Full production

N/A

1K+

$0.88

reel
of
500

NSUZXYTTE#
LM2937ES
-3.3

8 weeks

2000

General 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 5V logic supply, or higher input supply voltage, to the lower 2.5V and 3.3V supplies to power VLSI ASIC's 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 5V.

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. 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 +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 Sample Size	LTA Device Hours	FITS	MTTF (Hours)
LM2937ES-3.3	SLM	44046	3532500	1	1002356520
LM2937ESX-3.3	SLM	44046	3532500	1	1002356520
LM2937ET-3.3	SLM	44046	3532500	1	1002356520
LM2937IMP-3.3	SLM	44046	3532500	1	1002356520
LM2937IMPX-3.3	SLM	44046	3532500	1	1002356520

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.

[Information as of 7-Nov-2009]