LM2941S National Semiconductor, LM2941S Datasheet

IC, ADJ LDO REG, 5V TO 20V, 1A, TO-263-5

LM2941S

Manufacturer Part Number
LM2941S
Description
IC, ADJ LDO REG, 5V TO 20V, 1A, TO-263-5
Manufacturer
National Semiconductor
Datasheet

Specifications of LM2941S

Primary Input Voltage
26V
Output Voltage Adjustable Range
5V To 20V
Dropout Voltage Vdo
500mV
No. Of Pins
5
Output Current
1A
Operating Temperature Range
-40°C To +85°C
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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© 2007 National Semiconductor Corporation
LM2941/LM2941C
1A Low Dropout Adjustable Regulator
General Description
The LM2941 positive voltage regulator features the ability to
source 1A of output current with a typical dropout voltage of
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 pin current when the dif-
ferential 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 there-
fore only 30mA. Higher quiescent currents only exist when the
regulator is in the dropout mode (V
Designed also for vehicular applications, the LM2941 and all
regulated circuitry are protected from reverse battery instal-
lations or two-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
Connection Diagram and Ordering Information
16-Lead Ceramic Dual-in-Line Package
Note: Pin 2 & 7 are fused to center DAP
Order Number LM2941T or LM2941CT
LM2941J-QMLV, 5962-9166701QEA
See NS Package Number TO5A
See NS Package Number J16A
Order Number LM2941J/883
TO-220 Plastic Package
Top View
Top View
882331
IN
882302
− V
OUT
8823
Order Number LM2941S, LM2941SX or
LM2941WG-QMLV, 5962-9166701QYA
See NS Package Number WG16A
16-Lead Ceramic Surface Mount
TO-263 Surface-Mount Package
See NS Package Number TS5B
Order Number LM2941WG/883
3V).
LM2941CS, LM2941CSX
Top View
Package
and the load. Familiar regulator features such as short circuit
and thermal overload protection are also provided.
Features
LLP space saving package
Output voltage adjustable from 5V to 20V
Dropout voltage typically 0.5V @ I
Output current in excess of 1A
Trimmed reference voltage
Reverse battery protection
Internal short circuit current limit
Mirror image insertion protection
P
TTL, CMOS compatible ON/OFF switch
+
Product Enhancement tested
882332
882308
8-Lead LLP Surface Mount Package
See NS Package Number LDC08A
Ordering Number LM2941LD,
LM2941LDX
Top View
O
= 1A
November 7, 2007
882309
www.national.com
882333

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LM2941S Summary of contents

Page 1

... Mirror image insertion protection ■ Product Enhancement tested ■ TTL, CMOS compatible ON/OFF switch TO-263 Surface-Mount Package 882302 Order Number LM2941S, LM2941SX or LM2941CS, LM2941CSX See NS Package Number TS5B 16-Lead Ceramic Surface Mount Package Top View Order Number LM2941WG/883 LM2941WG-QMLV, 5962-9166701QYA See NS Package Number WG16A ...

Page 2

... LM2941T, LM2941S, LM2941LD LM2941CT, LM2941CS Internal Power Dissipation (Note 4) Maximum Junction Temperature Storage Temperature Range Lead Temperature (Soldering, 10 seconds) TO-220 (T) Package Electrical Characteristics—LM2941T, LM2941S, LM2941J, LM2941WG, LM2941LD ≤ ≤ = 22μF, unless otherwise specified. Specifications in standard typeface apply for 20V ...

Page 3

Electrical Characteristics—LM2941CT, LM2941CS ≤ ≤ = 22μF, unless otherwise specified. Specifications in standard typeface apply for 20V 5V while those in boldface type apply over the full Operating ...

Page 4

Note 6: All limits guaranteed at room temperature (standard typeface) and at temperature extremes (boldface type). All room temperature limits are 100% production tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods. ...

Page 5

Line Transient Response 882317 Ripple Rejection 882319 Low Voltage Behavior 882321 Load Transient Response Output Impedance Low Voltage Behavior 5 882318 882320 882322 www.national.com ...

Page 6

Output Capacitor ESR Output at Voltage Extremes Maximum Power Dissipation (TO-220) www.national.com Output at Voltage Extremes 882323 Peak Output Current 882325 Maximum Power Dissipation (TO-3) 882327 6 882324 882326 882328 ...

Page 7

Maximum Power Dissipation (TO-263) (Note 4) Definition of Terms Dropout Voltage: The input-voltage differential at which the circuit ceases to regulate against further reduction in input voltage. Measured when the output voltage has dropped 100mV from the nominal value obtained ...

Page 8

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

Page 9

Equivalent Schematic Diagram 9 882301 www.national.com ...

Page 10

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted Order Number LM2941J/883 LM2941J-QMLV, 5962-9166701QEA NS Package Number J16A Order Number LM2941WG/883 LM2941WG-QMLV, 5962-9166701QYA NS Package Number WG16A 10 ...

Page 11

... Order Number LM2941T or LM2941CT NS Package Number T05A TO-263 5-Lead Plastic Surface Mount Package Order Number LM2941S, LM2941SX, LM2941CS or LM2941CSX NS Package Number TS5B 11 www.national.com ...

Page 12

LLP Surface Mount Package Order Number LM2941LD, LM2941LDX NS Package Number LDC08A 12 ...

Page 13

Notes 13 www.national.com ...

Page 14

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