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參數資料
| 型號： | LM2940CT |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 基準電壓源/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的低壓差穩壓器的反向電流保護 |
| 文件頁數： | 1/20頁 |
| 文件大小： | 410K |
| 代理商： | LM2940CT |
January 2007
LM2940/LM2940C
1A Low Dropout Regulator
General Description
The LM2940/LM2940C positive voltage regulator features the
ability to source 1A of output current with a dropout voltage of
typically 0.5V and a maximum of 1V over the entire temper-
ature range. Furthermore, a quiescent current reduction cir-
cuit has been included which reduces the ground current
when the differential 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 therefore only 30 mA. Higher quiescent currents only exist
when the regulator is in the dropout mode (V
IN
V
OUT
≤
3V).
Designed also for vehicular applications, the LM2940/
LM2940C and all regulated circuitry are protected from re-
verse battery installations or 2-battery jumps. During line
transients, such as load dump when the input voltage can
momentarily exceed the specified maximum operating volt-
age, the regulator will automatically shut down to protect both
the internal circuits and the load. The LM2940/LM2940C can-
not be harmed by temporary mirror-image insertion. Familiar
regulator features such as short circuit and thermal overload
protection are also provided.
Features
■
Dropout voltage typically 0.5V @I
O
= 1A
■
Output current in excess of 1A
■
Output voltage trimmed before assembly
■
Reverse battery protection
■
Internal short circuit current limit
■
Mirror image insertion protection
■
P
+
Product Enhancement tested
Typical Application
882203
*Required if regulator is located far from power supply filter.
**C
must be at least 22
μ
F to maintain stability. May be increased without bound to maintain regulation during transients. Locate as close as possible to
the regulator. This capacitor must be rated over the same operating temperature range as the regulator and the ESR is critical; see curve.
Ordering Information
Temp
Range
Output Voltage
9.0
LM2940CT-9.0
Package
5.0
8.0
–
–
10
–
–
12
15
0°C
≤
T
J
≤
125°C
LM2940CT-5.0
LM2940CT-12
LM2940CT-15
TO-220
LM2940CS-5.0
LM2940CSX
-5.0
LM2940CS-9.0
LM2940CSX
-9.0
LM2940CS-12
LM2940CSX
-12
LM2940CS-15
LM2940CSX
-15
TO-263
–
–
40°C
≤
T
J
≤
125°C
LM2940LD-5.0
LM2940LD-8.0
LM2940LD-9.0
LM2940LD-10
LM2940LD-12
LM2940LD-15
LLP
1k Units
Tape and
Reel
LLP
4.5k
Units
Tape and
Reel
TO-220
LM2940LDX
-5.0
LM2940LDX
-8.0
LM2940LDX
-9.0
LM2940LDX
-10
LM2940LDX
-12
LM2940LDX
-15
40°C
≤
T
J
≤
125°C
LM2940T-5.0
LM2940T-8.0
LM2940T-9.0
LM2940T-10
LM2940T-12
–
–
–
LM2940S-5.0
LM2940S-8.0
LM2940S-9.0
LM2940S-10
LM2940S-12
TO-263
LM2940SX-5.0
LM2940SX-8.0
LM2940SX-9.0
LM2940SX-10
LM2940SX-12
2007 National Semiconductor Corporation
8822
www.national.com
L
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LM2940CT-12 | 功能描述:低壓差穩壓器 - 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 負載調節:0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LM2940CT-12 | 制造商:Texas Instruments 功能描述:IC V REG LDO +12V 2940 TO-220-3 |
| LM2940CT-12/LB01 | 制造商:Texas Instruments 功能描述:LDO Regulator Pos 12V 1A 3-Pin(3+Tab) TO-220 Rail |
| LM2940CT-12/NOPB | 功能描述:低壓差穩壓器 - 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 負載調節:0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LM2940CT-12P+ | 制造商:Texas Instruments 功能描述:Voltage Regulator, +12V, Bi-Polar, 3 Pin, Plastic, SIP |
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