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LM2940T-12.0 数据表(PDF) 7 Page - Texas Instruments

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部件名 LM2940T-12.0
功能描述  LM2940-N/LM2940C 1A Low Dropout Regulator
Download  35 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

LM2940T-12.0 数据表(HTML) 7 Page - Texas Instruments

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LM2940-N, LM2940C
www.ti.com
SNVS769I – MARCH 2000 – REVISED APRIL 2013
Electrical Characteristics (continued)
VIN = VO + 5V, IO = 1A, CO = 22 μF, unless otherwise specified. Boldface limits apply over the entire operating
temperature range of the indicated device. All other specifications apply for TA = TJ = 25°C.
Output Voltage (VO)
12V
15V
Parameter
Conditions
Typ
LM2940-N
LM2940-
Typ
LM2940-N
LM2940-
Units
Limit (1)
N/833
Limit (1)
N/833
Limit (2)
Limit (2)
Ripple Rejection
fO = 120 Hz, 1 Vrms,
IO = 100 mA
LM2940-N
66
54/48
dBMIN
LM2940C
66
54
64
52
fO = 1 kHz, 1 Vrms,
dBMIN
52/46
48/42
IO = 5 mA
Long Term Stability
mV/
48
60
1000 Hr
Dropout Voltage
IO = 1A
0.5
0.8/1.0
0.7/1.0
0.5
0.8/1.0
0.7/1.0
VMAX
IO = 100 mA
110
150/200
150/200
110
150/200
150/200
mVMAX
Short Circuit Current See (3)
1.9
1.6
1.6/1.3
1.9
1.6
1.6/1.3
AMIN
Maximum Line
RO = 100Ω
Transient
LM2940-N, T
≤ 100 ms
75
60/60
LM2940-N/883, T
≤ 20 ms
40/40
40/40
VMIN
LM2940C, T
≤ 1 ms
55
45
55
45
Reverse Polarity
RO = 100Ω
DC Input Voltage
LM2940-N, LM2940-N/883
−30
−15/−15
−15/−15
−15/−15
VMIN
LM2940C
−30
−15
−30
−15
Reverse Polarity
RO = 100Ω
Transient Input
LM2940-N, T
≤ 100 ms
−75
−50/−50
Voltage
LM2940-N/883, T
≤ 20 ms
−45/−45
−45/−45
VMIN
LM2940C, T
≤ 1 ms
−55
−45/−45
−55
−45/−45
(3)
Output current will decrease with increasing temperature but will not drop below 1A at the maximum specified temperature.
Thermal Performance
3-Lead TO-220
4
Thermal Resistance
°C/W
Junction-to-Case,
θ(JC)
3-Lead DDPAK/TO-263
4
3-Lead TO-220 (1)
60
3-Lead DDPAK/TO-263 (1)
80
Thermal Resistance
°C/W
Junction-to-Ambient,
θ(JA)
SOT-223(1)
174
8-Lead WSON (1)
35
(1)
The maximum allowable power dissipation is a function of the maximum junction temperature, TJ, the junction-to-ambient thermal
resistance,
θJA, and the ambient temperature, TA. Exceeding the maximum allowable power dissipation will cause excessive die
temperature, and the regulator will go into thermal shutdown. The value of
θJA (for devices in still air with no heatsink) is 60°C/W for the
TO-220 package, 80°C/W for the DDPAK/TO-263 package, and 174°C/W for the SOT-223 package. The effective value of
θJA can be
reduced by using a heatsink (see Application Hints for specific information on heatsinking). The value of
θJA for the WSON package is
specifically dependent on PCB trace area, trace material, and the number of layers and thermal vias. For improved thermal resistance
and power dissipation for the WSON package, refer to Application Note AN-1187 (SNOA401). It is recommended that 6 vias be placed
under the center pad to improve thermal performance.
Copyright © 2000–2013, Texas Instruments Incorporated
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Product Folder Links: LM2940-N LM2940C


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