LM2937IMP-12 National Semiconductor, LM2937IMP-12 Datasheet

Linear Voltage Regulator IC

LM2937IMP-12

Manufacturer Part Number
LM2937IMP-12
Description
Linear Voltage Regulator IC
Manufacturer
National Semiconductor
Datasheet

Specifications of LM2937IMP-12

No. Of Pins
4
Output Current
0.5A
Peak Reflow Compatible (260 C)
No
Supply Voltage
26V
Current Rating
500A
Output Voltage Max
12V
Supply Voltage Max
26V
Leaded Process Compatible
No
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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Part Number:
LM2937IMP-12
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20 000
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Part Number:
LM2937IMP-12
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0
© 2000 National Semiconductor Corporation
LM2937
500 mA Low Dropout Regulator
General Description
The LM2937 is a positive voltage regulator capable of sup-
plying 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 operat-
ing temperature range). Special circuitry has been incorpo-
rated to minimize the quiescent current to typically only
10 mA with a full 500 mA load current when the input to out-
put voltage differential is greater than 3V.
The LM2937 requires an output bypass capacitor for stabil-
ity. As with most low dropout regulators, the ESR of this ca-
pacitor remains a critical design parameter, but the LM2937
includes special compensation circuitry that relaxes ESR re-
quirements. 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 con-
Connection Diagram and Ordering Information
Order Number LM2937ET-5.0, LM2937ET-8.0,
LM2937ET-10, LM2937ET-12 or LM2937ET-15
See NS Package Number T03B
TO-220 Plastic Package
Front View
Top View
LM2937ES-10, LM2937ES-12 or LM2937ES-15
Order Number LM2937ES-5.0, LM2937ES-8.0,
DS011280-2
DS011280-5
DS011280
TO-263 Surface-Mount Package
See NS Package Number TS3B
nections, 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.
Features
n Fully specified for operation over −40˚C to +125˚C
n Output current in excess of 500 mA
n Output trimmed for 5% tolerance under all operating
n Typical dropout voltage of 0.5V at full rated load current
n Wide output capacitor ESR range, up to 3
n Internal short circuit and thermal overload protection
n Reverse battery protection
n 60V input transient protection
n Mirror image insertion protection
conditions
See NS Package Number MP04A
LM2937IMP-12 or LM2937IMP-15
LM2937IMP-8.0, LM2937IMP-10,
Order Number LM2937IMP-5.0,
SOT-223 Plastic Package
Front View
Side View
DS011280-6
DS011280-26
www.national.com
March 2000

Related parts for LM2937IMP-12

LM2937IMP-12 Summary of contents

Page 1

... Internal short circuit and thermal overload protection n Reverse battery protection n 60V input transient protection n Mirror image insertion protection DS011280-2 Order Number LM2937IMP-5.0, LM2937IMP-8.0, LM2937IMP-10, LM2937IMP-12 or LM2937IMP-15 See NS Package Number MP04A TO-263 Surface-Mount Package DS011280-5 Order Number LM2937ES-5.0, LM2937ES-8.0, LM2937ES-10, LM2937ES-12 or LM2937ES-15 See NS Package Number TS3B ...

Page 2

... The small physical size of the SOT-223 package does not allow sufficient space to provide the complete device part number. The actual devices will be labeled with the package markings shown. www.national.com (Continued) Output Voltage 8 LM2937ES-8.0 LM2937ES-10 LM2937ES-12 LM2937ET-8.0 LM2937ET-10 LM2937ET-12 LM2937IMP-8.0 LM2937IMP-10 LM2937IMP-12 LM2937IMPX-10 LM2937IMPX-12 L72B L73B L74B 2 NSC Package 15 Package Drawing LM2937ES-15 TS3B TO-263 LM2937ET-15 ...

Page 3

... Input Voltage (Note 1) TO-263 (10 seconds) SOT-223 (Vapor Phase, 60 seconds) SOT-223 (Infared, 15 seconds) ESD Susceptibility (Note 3) Operating Conditions 26V 60V Temperature Range (Note 2) Internally Limited LM2937ET, 150˚C LM2937IMP −65˚C to +150˚C Maximum Input Voltage 260˚ 25˚ Typ Limit I 4.85 OUTmax 5 ...

Page 4

Electrical Characteristics 5V, (Note NOM OUTmax age µF unless otherwise indicated. Boldface limits apply over the entire operating temperature range of the OUT indicted device., all other specifications are for ...

Page 5

Typical Performance Characteristics Dropout Voltage vs Output Current DS011280-7 Quiescent Current vs Temperature DS011280-10 Line Transient Response DS011280-13 Output Impedance DS011280-16 Dropout Voltage vs Temperature DS011280-8 Quiescent Current vs Input Voltage DS011280-11 Load Transient Response DS011280-14 Maximum Power Dissipation (TO-220) ...

Page 6

Typical Performance Characteristics Low Voltage Behavior DS011280-19 Output at Voltage Extremes DS011280-22 Peak Output Current DS011280-25 * Required if the regulator is located more than 3 inches from the power supply filter capacitors Required for stability. C must ...

Page 7

Application Hints EXTERNAL CAPACITORS The output capacitor is critical to maintaining regulator stabil- ity, and must meet the required conditions for both ESR (Equivalent Series Resistance) and minimum amount of ca- pacitance. MINIMUM CAPACITANCE: The minimum output capacitance required to ...

Page 8

Application Hints (Continued) is specified numerically by the heatsink manufacturer (H−A) in the catalog, or shown in a curve that plots temperature rise vs power dissipation for the heatsink. HEATSINKING TO-263 AND SOT-223 PACKAGE PARTS Both the TO-263 (“S”) and ...

Page 9

Physical Dimensions inches (millimeters) unless otherwise noted Plastic Package Order Number LM2937ET-5.0, LM2937ET-8.0, LM2937ET-10, LM2937ET-12, or LM2937ET-15 NS Package Number T03B 9 www.national.com ...

Page 10

Physical Dimensions Order Number LM2937ES-5.0, LM2937ES-8.0, LM2937ES-10, LM2937ES-12 or LM2937ES-15 www.national.com inches (millimeters) unless otherwise noted (Continued) TO-263 3-Lead Plastic Surface Mount Package NS Package Number TS3B 10 ...

Page 11

... Physical Dimensions Order Number LM2937IMP-5.0, LM2937IMP-8.0, LM2937IMP-10, LM2937IMP-12 or LM2937IMP-15 LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1 ...

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