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參數資料
| 型號： | LM2990T-12 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 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： | 12 V FIXED NEGATIVE LDO REGULATOR, 1 V DROPOUT, PSFM3 |
| 封裝： | PLASTIC, TO-220, 3 PIN |
| 文件頁數： | 1/12頁 |
| 文件大小： | 421K |
| 代理商： | LM2990T-12 |
LM2990
Negative Low Dropout Regulator
General Description
The LM2990 is a three-terminal, low dropout, 1 ampere
negative voltage regulator available with fixed output volt-
ages of 5, 5.2, 12, and 15V.
The LM2990 uses new circuit design techniques to provide
low dropout and low quiescent current. The dropout voltage
at 1A load current is typically 0.6V and a guaranteed
worst-case maximum of 1V over the entire operating tem-
perature range. The quiescent current is typically 1 mA with
1A load current and an input-output voltage differential
greater than 3V. A unique circuit design of the internal bias
supply limits the quiescent current to only 9 mA (typical)
when the regulator is in the dropout mode (V
OUT
V
≤
3V).
Output voltage accuracy is guaranteed to
±
5% over load,
and temperature extremes.
The LM2990 is short-circuit proof, and thermal shutdown in-
cludes hysteresis to enhance the reliability of the device
when overloaded for an extended period of time. The
LM2990 is available in a 3-lead TO-220 package and is rated
for operation over the automotive temperature range of
40C to +125C.
Features
n
5% output accuracy over entire operating range
n
Output current in excess of 1A
n
Dropout voltage typically 0.6V at 1A load
n
Low quiescent current
n
Internal short circuit current limit
n
Internal thermal shutdown with hysteresis
n
Functional complement to the LM2940 series
Applications
n
Post switcher regulator
n
Local, on-card, regulation
n
Battery operated equipment
Typical Application
Ordering Information and Connection Diagrams
Temperature
Range
Output Voltage
Package
-5.0
-5.2
-12
-15
40C to
+125C
LM2990T-5.0
LM2990S-5.0
LM2990J-5.0-QML
5962-9571101QEA
LM2990WG5.0-QML
5962-9571101QXA
LM2990T-5.2
LM2990T-12
LM2990S-12
LM2990J-12-QML
5962-9571001QEA
LM2990T-15
LM2990S-15
LM2990J-15-QML
5962-9570901QEA
TO-220
TO-263
55C to
+125C
J16A
WG16A
DS010801-1
*Required if the regulator is located further than 6 inches from the power supply filter capacitors. A 1 μF solid tantalum or a 10 μF aluminum electrolytic
*
Required for stability. Must be at least a 10 μF aluminum electrolytic or a 1 μF solid tantalum to maintain stability. May be increased without bound to
*
over the same operating temperature range as the regulator.
June 1999
L
1999 National Semiconductor Corporation
DS010801
www.national.com
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| LM2990T-15 | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| LM2990T-5.0 | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| LM2990T-5.2 | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LM2990T-12 | 制造商:Texas Instruments 功能描述:IC V REG LDO -12V 2990 TO-220-3 |
| LM2990T-12/NOPB | 功能描述:低壓差穩壓器 - LDO NEG 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 |
| LM2990T15 | 制造商:National Semiconductor 功能描述:LDO Regulator Neg -15V 1.8A 3-Pin(3+Tab) TO-220 Rail |
| LM2990T-15 | 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 |
| LM2990T-15.0 | 制造商:Texas Instruments 功能描述:IC V REG LDO -15V 2990 TO-220-3 |
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