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LM2941QML 1A Low Dropout Adjustable Regulator
August 25, 2009
LM2941QML
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
I
− V
O
≤
3V).
Originally designed for vehicular applications, the LM2941
and all regulated circuitry are protected from reverse battery
installations 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
and the load. Familiar regulator features such as short circuit
and thermal overload protection are also provided.
Features
■
Available with radiation guarantee
■
■
■
■
■
■
■
■
—
ELDRS Free
Output voltage adjustable from 5V to 20V
Dropout voltage typically 0.5V @ I
O
= 1A
Output current in excess of 1A
Trimmed reference voltage
Reverse battery protection
Internal short circuit current limit
Mirror image insertion protection
TTL, CMOS compatible ON/OFF switch
100 krad(Si)
Ordering Information
NS Part Number
LM2941WG/883
LM2941WG-QMLV
LM2941WGRLQMLV
ELDRS FREE
(Note 10)
LM2941 MDE
ELDRS FREE
(Note 10)
SMD Part Number
5962-9166701QYA
5962-9166701VYA
5962R9166702VYA
100 krad(Si)
5962R9166702V9A
100 krad(Si)
NS Package Number
WG16A
WG16A
WG16A
(Note 1)
Package Description
16LD Ceramic SOIC
16LD Ceramic SOIC
16LD Ceramic SOIC
Bare Die
Note 1: FOR ADDITIONAL DIE INFORMATION, PLEASE VISIT THE HI REL WEB SITE AT: www.national.com/analog/space/level_die
Connection Diagrams
16-Lead Ceramic Surface Mount Package
20158532
Top View
See NS Package Number WG16A
© 2009 National Semiconductor Corporation
201585
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LM2941QML
Equivalent Schematic Diagram
20158501
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2
LM2941QML
Absolute Maximum Ratings
(Note 2)
Input Voltage (Survival Voltage,
≤
100ms)
Internal Power Dissipation
(Note 3)
Maximum Junction Temperature
Storage Temperature Range
Lead Temperature (Soldering, 10 seconds)
Thermal Resistance
θ
JA
Ceramic SOIC (Still Air)
Ceramic SOIC (500LF/Min Air Flow)
θ
JC
Ceramic SOIC
(Note 4)
Package Weight (Typ)
Ceramic SOIC
ESD susceptibility to be determined.
(Note 5)
60V
Internally Limited
150°C
−65°C
≤
T
J
≤
+150°C
300°C
122°C/W
77°C/W
5°C/W
360mg
500V
Recommended Operating Conditions
Maximum Input Voltage
Temperature Range
26V
−55°C
≤
T
A
≤
125°C
Quality Conformance Inspection
Mil-Std-883, Method 5005 - Group A
Subgroup
1
2
3
4
5
6
7
8A
8B
9
10
11
12
13
14
Description
Static tests at
Static tests at
Static tests at
Dynamic tests at
Dynamic tests at
Dynamic tests at
Functional tests at
Functional tests at
Functional tests at
Switching tests at
Switching tests at
Switching tests at
Settling time at
Settling time at
Settling time at
Temp °C
25
125
-55
25
125
-55
25
125
-55
25
125
-55
25
125
-55
3
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LM2941QML
LM2941 Electrical Characteristics
DC Parameters
The following conditions apply, unless otherwise specified.
DC:
Symbol
V
Ref
V
RLine
5V
≤
V
O
≤
20V, V
IN
= V
O
+5V, C
O
= 22µF
Parameter
Reference Voltage
Line Regulation
Conditions
5mA
≤
I
O
≤
1A
V
O
+ 2V
≤
V
IN
≤
26V, I
O
= 5mA
50mA
≤
I
O
≤
1A, V
IN
= 10V,
V
OUT
= 5V
50mA
≤
I
O
≤
1A, V
IN
= 25V,
V
OUT
= 20V
V
O
+ 2V
≤
V
IN
≤
26V, I
O
= 5mA
I
Q
Quiescent Current
V
IN
= V
O
+ 5V, I
O
= 1A
(Note 8)
Notes
Min
Max
Unit
V
V
mV/V
mV/V
mV/V
mA
mA
mA
mA
V
V
mV
mV
A
A
V
DC
V
0.8
2.00
100
300
V
V
µA
µA
Sub-
groups
1
2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1
2, 3
1
2, 3
1
2, 3
1
2, 3
1
2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1
2, 3
1.237 1.313
1.211 1.339
10
10
(Note 8)
10
15
20
45
60
0.8
1.0
200
300
1.6
1.3
(Note 7)
3.5
3.7
26
-15
V
RLoad
Load Regulation
I
O
= 1A
V
DO
Dropout Voltage
I
O
= 100mA
I
SC
Short Circuit Current
Maximum Operational Input
Voltage
Reverse Polarity DC Input
Voltage
V
TH On
V
Th Off
ON/OFF Threshold Voltage ON
R
O
= 100Ω,
V
O
≥
-0.6V
I
O
≤
1A
V
IN Max
= 26V
(Note 6)
(Note 6)
(Note 6)
ON/OFF Threshold Voltage OFF I
O
≤
1A
ON/OFF Threshold Current
V
ON/OFF
= 2.0V, I
O
≤
1A
AC Parameters
The following conditions apply, unless otherwise specified.
AC:
Symbol
5V
≤
V
O
≤
20V, V
IN
= V
O
+5V, C
O
= 22µF
Parameter
Maximum Line Transient
Conditions
= 100Ω,
t
≤
100mS
V
O Max
1V above nominal V
O
, R
O
Notes
Min
60
-50
(Note 9)
(Note 9)
0.02
0.04
Max
Unit
V
V
%/V
%/V
Sub-
groups
4, 5, 6
4, 5, 6
4
5, 6
Reverse Polarity Transient Input t
≤
100mS, R
O
= 100Ω
Voltage
RR
Ripple Rejection
ƒ
O
= 1KHz, 1 V
RMS
, I
L
= 100mA
ƒ
O
= 1KHz, 1 V
RMS
, I
L
= 100mA
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