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LM2941 데이터시트(PDF) 3 Page - National Semiconductor (TI)

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부품명 LM2941
상세설명  1A Low Dropout Adjustable Regulator
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제조업체  NSC [National Semiconductor (TI)]
홈페이지  http://www.national.com
Logo NSC - National Semiconductor (TI)

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Electrical Characteristics — LM2941CT, LM2941CS
5V
≤ V
O ≤ 20V, VIN = VO + 5V, CO = 22 µF, unless otherwise specified. Specifications in standard typeface apply for TJ =
25˚C, while those in boldface type apply over the full Operating Temperature Range.
Parameter
Conditions
Typ
Limit
Units
(Note 5)
(Limits)
Reference Voltage
5 mA
≤ I
O ≤ 1A (Note 6)
1.275
1.237/1.211
V(min)
1.313/1.339
V(max)
Line Regulation
V
O +2V ≤ VIN ≤ 26V, IO = 5 mA
4
10
mV/V(max)
Load Regulation
50 mA
≤ I
O ≤ 1A
7
10
mV/V(max)
Output Impedance
100 mADC and 20 mArms
7
m
Ω/V
f
O = 120 Hz
Quiescent Current
V
O +2V ≤ VIN < 26V, IO = 5 mA
10
15
mA(max)
V
IN = VO + 5V, IO = 1A
30
45/60
mA(max)
RMS Output Noise,
10 Hz–100 kHz
0.003
%
% of V
OUT
I
O = 5mA
Ripple Rejection
f
O = 120 Hz, 1 Vrms, IL = 100 mA
0.005
0.02
%/V(max)
Long Term Stability
0.4
%/1000 Hr
Dropout Voltage
I
O = 1A
0.5
0.8/1.0
V(max)
I
O = 100 mA
110
200/200
mV(max)
Short Circuit Current
V
IN max = 26V (Note 7)
1.9
1.6
A(min)
Maximum Line
V
O max 1V above nominal VO
55
45
V(min)
Transient
R
O = 100Ω,T ≤ 100 ms
Maximum Operational Input
Voltage
31
26
V
DC
Reverse Polarity DC Input
Voltage
R
O = 100Ω,VO ≥ −0.6V
−30
−15
V(min)
Reverse Polarity Transient
Input Voltage
T
≤ 100 ms, R
O = 100Ω
−55
−45
V(min)
ON/OFF Threshold Voltage
ON
I
O ≤ 1A
1.30
0.80
V(max)
ON/OFF Threshold Voltage
OFF
I
O ≤ 1A
1.30
2.00
V(min)
ON/OFF Threshold Current
V
ON/OFF = 2.0V, IO ≤ 1A
50
100
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 TJ(max), θJA, and TA. The maximum allowable power dissipation at any ambient temperature is PD = (TJ-
(max) − TA)/θJA. 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 (
θJA) is 53˚C/W, and the junction-to-case thermal resistance (θJC) is 3˚C/W. For the LM2941K, θJA is 35˚C/W
and
θJC is 4˚C/W. The junction-to-ambient thermal resistance of the TO-263 is 73˚C/W, and junction-to-case thermal resistance, θJC 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,
θJA is 50˚C/W; with 1 square inch of copper area, θJA is 37˚C/W; and with 1.6 or more square inches of copper area, θJA 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.
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