HOME HOME SELECT DESIGN BUY EXPLORE About Us Support My Profile Search

 Products > Analog - Regulators > Linear Regulators - Low Dropout Voltage > Positive Voltage - Fixed > LM2940C

LM2940C  Product Folder

1A Low Dropout Regulator
Generic P/N 2940C
General
Description		 Features Datasheet Package
& Models		 Samples
& Pricing		 Reliability
Metrics		 Application
Notes

Parametric Table Parametric Table
Temperature Min (deg C) -55 
Temperature Max (deg C) 125 
Multiple Output Capability No 
On/Off Pin No 
Error Flag No 
InputMin Voltage (Volt) - 
InputMax Voltage (Volt) 26 
Output Current (mA) 1000 
Dropout Voltage (Volt) .50 
Quiescent Current (mA) 10 
SecondaryOutput Voltage (Volt) - 
SecondaryOutput Current (Amp) - 
RegType LDO 
Output Voltage (Volt) 12, 15, 5, 9 
Watchdog - 

Datasheet

TitleSize in KbytesDate
View Online
Download
Receive via Email
LM2940 LM2940C 1A Low Dropout Regulator 504 Kbytes 27-Jan-03 View Online Download Receive via Email
LM2940 LM2940C 1A Low Dropout Regulator (JAPANESE)
 772 Kbytes   View Online Download Receive via Email

If you have trouble printing or viewing PDF file(s), see Printing Problems.

Package Availability, Models, Samples & Pricing

Part NumberPackageStatusModelsSamples &
Electronic
Orders		Budgetary PricingStd
Pack
Size		Package
Marking
TypePinsMSL/Lead-Free AvailabilityLead
Time		QtySPICEIBISQty$US each
LM2940CT-12TO 2203StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$0.53rail
of
45		NSUZXYTT
LM2940CT
-12 P+
7-9 weeks50000
LM2940CT-15TO 2203StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$0.50rail
of
45		NSUZXYTT
LM2940CT
-15 P+
3-5 weeks50000
LM2940CT-5.0TO 2203StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$0.50rail
of
45		NSUZXYTT
LM2940CT
-5.0 P+
11-13 weeks100000
LM2940CT-9.0TO 2203StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$0.50rail
of
45		NSUZXYTT
LM2940CT
-9.0 P+
3-5 weeks50000
LM2940CS-12TO 2633StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$0.39rail
of
45		NSUZXYTT
LM2940CS
-12 P+
13 weeks0
LM2940CS-15TO 2633StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$0.39rail
of
45		NSUZXYTT
LM2940CS
-15 P+
13 weeks0
LM2940CS-5.0TO 2633StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$0.39rail
of
45		NSUZXYTT
LM2940CS
-5.0 P+
13 weeks0
LM2940CS-9.0TO 2633StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$0.39rail
of
45		NSUZXYTT
LM2940CS
-9.0 P+
13 weeks0
LM2940CSX-12TO 2633StatusFull productionN/AN/A 
Buy Now 		1K+$0.39reel
of
500		NSUZXYTT
LM2940CS
-12 P+
13 weeks0
LM2940CSX-15TO 2633StatusFull productionN/AN/A 
Buy Now		1K+$0.39reel
of
500		NSUZXYTT
LM2940CS
-15 P+
14 weeks0
LM2940CSX-5.0TO 2633StatusFull productionN/AN/A 
Buy Now 		1K+$0.39reel
of
500		NSUZXYTT
LM2940CS
-5.0 P+
14 weeks0
LM2940CSX-9.0TO 2633StatusFull productionN/AN/A 
Buy Now 		1K+$0.39reel
of
500		NSUZXYTT
LM2940CS
-9.0 P+
13 weeks0
LM2940C-15 MDCUnpackaged DieFull productionN/AN/A   tray
of
N/A		-
N/A0
LM2940C-5 MDCUnpackaged DieFull productionN/AN/ASamples  tray
of
N/A		-
N/A0
LM2940C-12 MDCUnpackaged DieFull productionN/AN/A   tray
of
N/A		-
N/A0
LM2940C-9 MDCUnpackaged DieFull productionN/AN/A   tray
of
N/A		-
N/A0
LM2940C-12 MWCWaferFull productionN/AN/A   wafer jar
of
N/A		-
N/A0
LM2940C-15 MWCWaferFull productionN/AN/A   wafer jar
of
N/A		-
N/A0
LM2940C-5 MWCWaferFull productionN/AN/A   wafer jar
of
N/A		-
13-15 weeks0
LM2940C-9 MWCWaferFull productionN/AN/A   wafer jar
of
N/A		-
N/A0
LM2940-12 MD8Unpackaged DieFull productionN/AN/A   tray
of
N/A		-
N/A0
LM2940-12 MW8WaferFull productionN/AN/A   wafer jar
of
N/A		-
N/A0

General Description

The LM2940/LM2940C positive voltage regulator features the ability to source 1A of output current with a dropout voltage of typically 0.5V and a maximum of 1V over the entire temperature range. Furthermore, a quiescent current reduction circuit has been included which reduces the ground current when the differential between the input voltage and the output voltage exceeds approximately 3V. The quiescent current with 1A of output current and an input-output differential of 5V is therefore only 30 mA. Higher quiescent currents only exist when the regulator is in the dropout mode (VIN - VOUT <= 3V).

Designed also for vehicular applications, the LM2940/LM2940C and all regulated circuitry are protected from reverse battery installations or 2-battery jumps. During line transients, such as load dump when the input voltage can momentarily exceed the specified maximum operating voltage, the regulator will automatically shut down to protect both the internal circuits and the load. The LM2940/LM2940C cannot be harmed by temporary mirror-image insertion. Familiar regulator features such as short circuit and thermal overload protection are also provided.

Features

  • Dropout voltage typically 0.5V @IO = 1A
  • Output current in excess of 1A
  • Output voltage trimmed before assembly
  • Reverse battery protection
  • Internal short circuit current limit
  • Mirror image insertion protection
  • P+ Product Enhancement tested

Reliability Metrics

Part Number Process Early Failure Rate - Rejects Sample Size (EFR) PPM * Rel. Rejects Device Hours Long Term Failure Rates (FITS) MTTF
LM2940C-9 MDCSLM0350000015000003424108012
LM2940C-9 MWCSLM0350000015000003424108012
LM2940CS-12SLM0350000015000003424108012
LM2940CS-15SLM0350000015000003424108012
LM2940CS-5.0SLM0350000015000003424108012
LM2940CS-9.0SLM0350000015000003424108012
LM2940CSX-12SLM0350000015000003424108012
LM2940CSX-15SLM0350000015000003424108012
LM2940CSX-5.0SLM0350000015000003424108012
LM2940CSX-9.0SLM0350000015000003424108012
LM2940CT-12SLM0350000015000003424108012
LM2940CT-15SLM0350000015000003424108012
LM2940CT-5.0SLM0350000015000003424108012
LM2940CT-9.0SLM0350000015000003424108012

For more information on Reliablitity Metrics, please click here.


Application Notes

TitleSize in KbytesDate
View Online
Download
Receive via Email
AN-1148: Application Note 1148 Linear Regulators: Theory of Operation and Compensation 200 Kbytes 25-Sep-02 View Online Download Receive via Email

If you have trouble printing or viewing PDF file(s), see Printing Problems.

[Information as of 15-Jan-2004]

Website Guide • About "Cookies" • National is QS 9000 Certified • Privacy/Security Statement • Contact Us/Feedback
Site Terms & Conditions of Use • Copyright 2003© National Semiconductor Corporation