lm2940-5.0 National Semiconductor Corporation, lm2940-5.0 Datasheet

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lm2940-5.0

Manufacturer Part Number
lm2940-5.0
Description
Lm2940qml 1a Low Dropout Regulator
Manufacturer
National Semiconductor Corporation
Datasheet
© 2010 National Semiconductor Corporation
1A Low Dropout Regulator
General Description
The LM2940 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 differ-
ential between the input voltage and the output voltage ex-
ceeds approximately 3V. The quiescent current with 1A of
output current and an input-output differential of 5V is there-
fore only 30 mA. Higher quiescent currents only exist when
the regulator is in the dropout mode (V
Designed also for vehicular applications, the LM2940 and all
regulated circuitry are protected from reverse battery instal-
lations 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 au-
Ordering Information
Note 1: FOR ADDITIONAL DIE INFORMATION, PLEASE VISIT THE HI REL WEB SITE AT: www.national.com/analog/space/level_die
NS Part Number
LM2940WG-5.0/883
LM2940WG5.0RLQV
ELDRS FREE
LM2940–5.0 MDE
ELDRS FREE
(Note
(Note
7)
7)
SMD Part Number
5962-8958701XA
5962R8958702VXA
100 krad(Si)
5962R8958702V9A
100 krad(Si)
IN
201584
− V
OUT
3V).
LM2940QML
NS Package Number
tomatically shut down to protect both the internal circuits and
the load. The LM2940 cannot be harmed by temporary mirror-
image insertion. Familiar regulator features such as short
circuit and thermal overload protection are also provided.
Features
Available with radiation guarantee
— ELDRS Free
Dropout voltage typically 0.5V @I
Output current in excess of 1A
Output voltage trimmed before assembly
Reverse battery protection
Internal short circuit current limit
Mirror image insertion protection
(Note
WG16A
WG16A
1)
Package Description
16LD Ceramic SOIC
16LD Ceramic SOIC
BARE DIE
O
= 1A
www.national.com
May 10, 2010
100 krad(Si)

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lm2940-5.0 Summary of contents

Page 1

... Note 1: FOR ADDITIONAL DIE INFORMATION, PLEASE VISIT THE HI REL WEB SITE AT: www.national.com/analog/space/level_die © 2010 National Semiconductor Corporation LM2940QML tomatically shut down to protect both the internal circuits and the load. The LM2940 cannot be harmed by temporary mirror- image insertion. Familiar regulator features such as short circuit and thermal overload protection are also provided. Features ■ ...

Page 2

Connection Diagrams Equivalent Schematic Diagram www.national.com 16-Lead Ceramic Surface-Mount Package (WG) 20158444 Top View See NS Package Number WG16A 2 20158401 ...

Page 3

Absolute Maximum Ratings ≤ Input Voltage (Survival Voltage 100mS) Internal Power Dissipation with no heat sink (T Maximum Junction Temperature Storage Temperature Range Lead Temperature (Soldering 10 seconds) Thermal Resistance  θ JA 16LD Ceramic SOIC (Still Air) 16LD Ceramic SOIC ...

Page 4

... LM2940-5.0 Electrical Characteristics DC Parameters The following conditions apply, unless otherwise specified. DC 10V 1A 22µ Symbol Parameter V Output Voltage O Reverse Polarity Input Voltage DC I Quiescent Current Q V Line Regulation RLine V Load Regulation RLoad V Dropout Voltage DO I Short Circuit Current SC www ...

Page 5

AC Parameters SMD: 5962R8958701 The following conditions apply, unless otherwise specified. AC 10V 1A 22µ Symbol Parameter Max Line Transient Reverse Polarity Input Voltage Transient RR Ripple Rejection N Output Noise ...

Page 6

... LM2940-5.0 Electrical Characteristics DC Parameters The following conditions apply, unless otherwise specified. DC 10V 1A 22µ Symbol Parameter V Output Voltage O Reverse Polarity Input Voltage DC I Quiescent Current Q V Line Regulation RLine V Load Regulation RLoad V Dropout Voltage DO I Short Circuit Current SC www ...

Page 7

AC Parameters SMD: 5962R8958702 The following conditions apply, unless otherwise specified. AC 10V 1A 22µ Symbol Parameter Max Line Transient Reverse Polarity Input Voltage Transient RR Ripple Rejection N Output Noise ...

Page 8

Typical Performance Characteristics Dropout Voltage Output Voltage vs. Temperature Quiescent Current www.national.com Dropout Voltage vs. Temperature 20158413 Quiescent Current vs. Temperature 20158415 Quiescent Current 20158417 8 20158414 20158416 20158418 ...

Page 9

Line Transient Response 20158419 Ripple Rejection 20158421 Low Voltage Behavior 20158429 Load Transient Response Low Voltage Behavior Low Voltage Behavior 9 20158420 20158425 20158430 www.national.com ...

Page 10

Output at Voltage Extremes Output at Voltage Extremes Peak Output Current www.national.com Output at Voltage Extremes 20158431 Output Capacitor ESR 20158436 Output Impedance 20158408 10 20158435 20158406 20158422 ...

Page 11

Typical Application *Required if regulator is located far from power supply filter. must be at least 22 μF to maintain stability. May be increased without bound to maintain regulation during transients. Locate as close as possible to the **C OUT ...

Page 12

... New ELDRS device. Change AC subgroups from 8A for parameters Max Line Transient, Reverse Polarity Input Voltage Transient, Output Noise Voltage, Output Impedance. To bring it into agreement with the SMD. MNLM2940-5.0-X Rev 1A1 will be archived. 12 Changes ...

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Physical Dimensions inches (millimeters) unless otherwise noted 16 Lead Surface Mount Package (WG) See NS Package Number WG16A 13 www.national.com ...

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... National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. ...

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