LM2937ET-5.0 National Semiconductor, LM2937ET-5.0 Datasheet

IC, LDO VOLT REG, 5V, 0.5A, TO-220


Manufacturer Part Number
IC, LDO VOLT REG, 5V, 0.5A, TO-220
National Semiconductor

Specifications of LM2937ET-5.0

Primary Input Voltage
Output Voltage Fixed
Dropout Voltage Vdo
No. Of Pins
Output Current
Operating Temperature Range
-40°C To +125°C
Termination Type
Through Hole
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

Available stocks

Part Number
Part Number:
Texas Instruments
11 240
Part Number:
National Semiconductor
1 786
Part Number:
Part Number:
Texas Instruments
19 011
© 2005 National Semiconductor Corporation
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 oper-
ating temperature range). Special circuitry has been incor-
porated 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 stabil-
ity. 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
3Ω. 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
Connection Diagrams
TO-263 Surface-Mount Package
TO-220 Plastic Package
Front View
Top View
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.
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 3Ω
n Internal short circuit and thermal overload protection
n Reverse battery protection
n 60V input transient protection
n Mirror image insertion protection
SOT-223 Plastic Package
Front View
Side View
August 2005

Related parts for LM2937ET-5.0

LM2937ET-5.0 Summary of contents

Page 1

... Connection Diagrams TO-220 Plastic Package Front View TO-263 Surface-Mount Package Top View © 2005 National Semiconductor Corporation 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. Features n Fully specified for operation over − ...

Page 2

... Part Number Packaging Marking LM2937ES-5.0 LM2937ES-5.0 LM2937ESX-5.0 LM2937ES-8.0 LM2937ES-8.0 LM2937ESX-8.0 LM2937ES-10 LM2937ES-10 LM2937ESX-10 LM2937ES-12 LM2937ES-12 LM2937ESX-12 LM2937ES-15 LM2937ES-15 LM2937ESX-15 LM2937ET-5.0 LM2937ET-5.0 LM2937ET-8.0 LM2937ET-8.0 LM2937ET-10 LM2937ET-10 LM2937ET-12 LM2937ET-12 LM2937ET-15 LM2937ET-15 LM2937IMP-5.0 L71B LM2937IMPX-5.0 LM2937IMP-8.0 L72B LM2937IMPX-8.0 LM2937IMP-10 L73B LM2937IMPX-10 LM2937IMP-12 L74B ...

Page 3

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

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 Output Voltage vs. Temperature Quiescent Current vs. Input Voltage Dropout Voltage vs. Temperature 01128007 Quiescent Current vs. Temperature 01128009 Quiescent Current vs. Output Current 01128011 5 01128008 01128010 01128012 www.national.com ...

Page 6

Typical Performance Characteristics Line Transient Response Ripple Rejection Maximum Power Dissipation (TO-220) www.national.com (Continued) Load Transient Response 01128013 01128015 Maximum Power Dissipation (TO-263)(Note 2) 01128017 6 01128014 Output Impedance 01128016 01128018 ...

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Typical Performance Characteristics Low Voltage Behavior Low Voltage Behavior Output at Voltage Extremes (Continued) 01128019 Output at Voltage Extremes 01128021 01128023 7 Low Voltage Behavior 01128020 01128022 Output Capacitor ESR 01128024 www.national.com ...

Page 8

Typical Performance Characteristics Peak Output Current Typical Application * Required if the regulator is located more than 3 inches from the power supply filter capacitors. ** Required for stability. C must be at least 10 µF (over the full expected ...

Page 9

Application Hints EXTERNAL CAPACITORS The output capacitor is critical to maintaining regulator sta- bility, 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 10

Application Hints (Continued) When a value for θ is found using the equation shown, (H−A) a heatsink must be selected that has a value that is less than or equal to this number. θ is specified numerically by the heatsink ...

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Application Hints (Continued) FIGURE 6. Maximum Power Dissipation vs T the SOT-223 Package SOT-223 SOLDERING RECOMMENDATIONS It is not recommended to use hand soldering or wave sol- dering to attach the small SOT-223 package to a printed circuit board. The ...

Page 12

... 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 Plastic Package Order Number LM2937ET-5.0, LM2937ET-8.0, LM2937ET-10, LM2937ET-12, or LM2937ET-15 NS Package Number T03B TO-263 3-Lead Plastic Surface Mount Package NS Package Number TS3B 12 ...

Page 13

... BANNED SUBSTANCE COMPLIANCE National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...

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