Electrical Characteristics — LM2941CT, LM2941CS
5V
≤
V
O
≤
20V, V
IN
= V
O
+ 5V, C
O
= 22 µF, unless otherwise specified. Specifications in standard typeface apply for T
J
=
25˚C, while those in
boldface type
apply over the full
Operating Temperature Range.
Parameter
Reference Voltage
Line Regulation
Load Regulation
Output Impedance
Quiescent Current
RMS Output Noise,
% of V
OUT
Ripple Rejection
Long Term Stability
Dropout Voltage
Short Circuit Current
Maximum Line
Transient
Maximum Operational Input
Voltage
Reverse Polarity DC Input
Voltage
Reverse Polarity Transient
Input Voltage
ON/OFF Threshold Voltage
ON
ON/OFF Threshold Voltage
OFF
ON/OFF Threshold Current
R
O
= 100Ω, V
O
≥
−0.6V
T
≤
100 ms, R
O
= 100Ω
I
O
≤
1A
I
O
≤
1A
V
ON/OFF
= 2.0V, I
O
≤
1A
I
O
= 1A
I
O
= 100 mA
V
IN
max = 26V (Note 7)
V
O
max 1V above nominal V
O
R
O
= 100Ω, T
≤
100 ms
Conditions
5 mA
≤
I
O
≤
1A (Note 6)
V
O
+ 2V
≤
V
IN
≤
26V, I
O
= 5 mA
50 mA
≤
I
O
≤
1A
100 mADC and 20 mArms
f
O
= 120 Hz
V
O
+ 2V
≤
V
IN
<
26V, I
O
= 5 mA
V
IN
= V
O
+ 5V, I
O
= 1A
10 Hz–100 kHz
I
O
= 5 mA
f
O
= 120 Hz, 1 Vrms, I
L
= 100 mA
Typ
1.275
4
7
7
10
30
0.003
0.005
0.4
0.5
110
1.9
55
0.8/1.0
200/200
1.6
45
0.02
15
45/60
Limit
(Note 5)
1.237/1.211
1.313/1.339
10
10
Units
(Limits)
V(min)
V(max)
mV/V(max)
mV/V(max)
mΩ/V
mA(max)
mA(max)
%
%/V(max)
%/1000 Hr
V(max)
mV(max)
A(min)
V(min)
31
−30
−55
1.30
1.30
50
26
−15
−45
0.80
2.00
100
V
DC
V(min)
V(min)
V(max)
V(min)
µA(max)
Note 1:
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating ratings indicate conditions for which the device is in-
tended to be functional, but device parameter specifications may not be guaranteed under these conditions. For guaranteed specifications and test conditions, see
the Electrical Characteristics.
Note 2:
A military RETS specification available upon request. For more information about military-aerospace products, see the Mil-Aero web page at
http://www.national.com/appinfo/milaero/index.html.
Note 3:
The maximum power dissipation is a function of T
J
(max),
θ
JA
, and T
A
. The maximum allowable power dissipation at any ambient temperature is P
D
= (T
J-
(max) − T
A
)/θ
JA
. If this dissipation is exceeded, the die temperature will rise above 150˚C and the LM2941 will go into thermal shutdown. For the LM2941T and
LM2941CT, the junction-to-ambient thermal resistance (θ
JA
) is 53˚C/W, and the junction-to-case thermal resistance (θ
JC
) is 3˚C/W. For the LM2941K,
θ
JA
is 35˚C/W
and
θ
JC
is 4˚C/W. The junction-to-ambient thermal resistance of the TO-263 is 73˚C/W, and junction-to-case thermal resistance,
θ
JC
is 3˚C. If the TO-263 package
is used, the thermal resistance can be reduced by increasing the P.C. board copper area thermally connected to the package: Using 0.5 square inches of copper area,
θ
JA
is 50˚C/W; with 1 square inch of copper area,
θ
JA
is 37˚C/W; and with 1.6 or more square inches of copper area,
θ
JA
is 32˚C/W.
Note 4:
All limits guaranteed at room temperature (standard typeface) and at temperature extremes (boldface type). All limits are used to calculate Outgoing Quality
Level, and are 100% production tested.
Note 5:
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.
Note 6:
The output voltage range is 5V to 20V and is determined by the two external resistors, R1 and R2. See Typical Application Circuit.
Note 7:
Output current capability will decrease with increasing temperature, but will not go below 1A at the maximum specified temperatures.
3
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