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參數(shù)資料
| 型號： | LM3940 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| 中文描述： | 無電容，NMOS管，150mA的低壓差穩(wěn)壓器的反向電流保護(hù) |
| 文件頁數(shù)： | 3/11頁 |
| 文件大?。?/td> | 291K |
| 代理商： | LM3940 |
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Storage Temperature Range
65C to +150C
Operating Junction Temperature Range
Lead Temperature (Soldering, 5 seconds)
Power Dissipation (Note 2)
Input Supply Voltage
ESD Rating (Note 3)
40C to +125C
260C
Internally Limited
7.5V
2 kV
Electrical Characteristics
Limits in standard typeface are for T
J
= 25C, and limits in
boldface type
apply over the full operating temperature range. Un-
less otherwise specified: V
IN
= 5V, I
L
= 1A, C
OUT
= 33 μF.
Symbol
Parameter
Conditions
Typical
LM3940
(Note 4)
min
3.20
3.13
Units
max
3.40
3.47
40
V
O
Output Voltage
5 mA
≤
I
L
≤
1A
3.3
V
Line Regulation
I
L
= 5 mA
4.5V
≤
V
O
≤
5.5V
50 mA
≤
I
L
≤
1A
20
mV
Load Regulation
35
50
80
Z
O
Output Impedance
I
L
(DC) = 100 mA
I
L
(AC) = 20 mA (rms)
f = 120 Hz
4.5V
≤
V
IN
≤
5.5V
I
L
= 5 mA
V
IN
= 5V
I
L
= 1A
BW = 10 Hz–100 kHz
I
L
= 5 mA
I
L
= 1A
35
m
I
Q
Quiescent Current
10
15
20
200
250
mA
110
e
n
Output Noise Voltage
150
μV (rms)
V
O
V
IN
Dropout Voltage
(Note 5)
0.5
0.8
1.0
150
200
V
I
L
= 100 mA
110
mV
I
L
(SC)
Short Circuit Current
R
L
= 0
1.7
1.2
A
Note 1:
Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating the de-
vice outside of its rated operating conditions.
Note 2:
The maximum allowable power dissipation is a function of the maximum junction temperature, T
, the junction-to-ambient thermal resistance,
θ
, and the
ambient temperature, T
. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown.
The value of
θ
(for devices in still air with no heatsink) is 60C/W for the TO-220 package, 80C/W for the TO-263 package, and 174C/W for the SOT-223 package.
The effective value of
θ
JA
can be reduced by using a heatsink (see Application Hints for specific information on heatsinking).
Note 3:
ESD rating is based on the human body model: 100 pF discharged through 1.5 k
.
Note 4:
All limits guaranteed for T
= 25C are 100% tested and are used to calculate Outgoing Quality Levels. All limits at temperature extremes are guaranteed
via correlation using standard Statistical Quality Control (SQC) methods.
Note 5:
Dropout voltage is defined as the input-output differential voltage where the regulator output drops to a value that is 100 mV below the value that is measured
at V
IN
= 5V.
www.national.com
3
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| LM3940_03 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:1A Low Dropout Regulator for 5V to 3.3V Conversion |
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| LM3940IMP-3.3 | 功能描述:低壓差穩(wěn)壓器 - LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LM3940IMP-3.3 | 制造商:Texas Instruments 功能描述:V REG LDO +3.3V 3940 SOT-223-3 |
| LM3940IMP-3.3/NOPB | 功能描述:低壓差穩(wěn)壓器 - LDO 1A LDO REG RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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