LM2940T-5.0

更新时间： 2024-01-30 14:57:21

品牌	Logo	应用领域
美国国家半导体 - NSC		稳压器调节器输出元件 PC 局域网
页数	文件大小	规格书
19页	500K
描述
1A Low Dropout Regulator

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中文翻译

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数据手册
替代型号

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LM2940T-5.0 数据手册

January 2003

LM2940/LM2940C

1A Low Dropout Regulator

General Description

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 cannot be harmed by temporary mirror-image in-

sertion. Familiar regulator features such as short circuit and

thermal overload protection are also provided.

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 temperature range. Furthermore, a quiescent current

reduction circuit has been included which reduces the

ground current when the differential between the input volt-

age 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).

Features

n Dropout voltage typically 0.5V I_O= 1A

n Output current in excess of 1A

n Output voltage trimmed before assembly

n Reverse battery protection

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

n Internal short circuit current limit

n Mirror image insertion protection

n P⁺Product Enhancement tested

Typical Application

00882203

Required if regulator is located far from power supply filter.

must be at least 22 µF to maintain stability. May be increased without bound to maintain regulation during transients. Locate as close as possible

OUT

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

Temperature

Range

Output Voltage

9.0

Package

5.0

8.0

0˚C ≤ T_J≤ 125˚C LM2940CT-5.0

LM2940CT-9.0

LM2940CS-9.0

LM2940CT-12

LM2940CS-12

LM2940CT-15

LM2940CS-15

LM2940LD-15

TO-220

TO-263

LM2940CS-5.0

−40˚C ≤ T_J

≤

LM2940LD-5.0

LM2940LD-8.0 LM2940LD-9.0

LM2940LD-10 LM2940LD-12

LLP 1k

Units

Tape and

Reel

125˚C

LM2940LDX-5.0

LM2940LDX-8.0 LM2940LDX-9.0

LM2940LDX-10 LM2940LDX-12 LM2940LDX-15

LLP 4.5k

Units

Tape and

Reel

−40˚C ≤ T_J

≤

LM2940T-5.0

LM2940S-5.0

LM2940T-8.0

LM2940S-8.0

LM2940T-9.0

LM2940S-9.0

LM2940T-10

LM2940S-10

LM2940T-12

LM2940S-12

TO-220

125˚C

TO-263

−40˚C ≤ T_J

LM2940IMP-5.0 LM2940IMP-8.0 LM2940IMP-9.0 LM2940IMP-10 LM2940IMP-12 LM2940IMP-15

SOT-223

85˚C

LM2940IMPX-5.0 LM2940IMPX-8.0 LM2940IMPX-9.0 LM2940IMPX-10 LM2940IMPX-12 LM2940IMPX-15 SOT-223

in Tape

and Reel

SOT-223

Package Marking

L53B

L54B

L0EB

L55B

L56B

L70B

The physical size of the SOT-223 is too small to contain the full device part number. The package markings indicated are what will appear on the actual device.

DS008822

www.national.com

12 3 4 5 6 7...19

中文翻译

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LM2940T-5.0 替代型号

型号	品牌	替代类型	描述	数据表
LM2940T-5.0/NOPB	TI	功能相似	LM2940-N/LM2940C 1A Low Dropout Regulator
LM2937ET-3.3/NOPB	TI	功能相似	LM2937-2.5, LM2937-3.3 400mA and 500mA Voltage Regulators
UA7805CKCS	TI	功能相似	POSITIVE-VOLTAGE REGULATORS

与LM2940T-5.0相关器件

型号	品牌	获取价格	描述	数据表
LM2940T-5.0/LF08	TI	获取价格	LM2940-N/LM2940C 1A Low Dropout Regulator
LM2940T-5.0/NOPB	TI	获取价格	LM2940-N/LM2940C 1A Low Dropout Regulator
LM2940T-8.0	TI	获取价格	LM2940-N/LM2940C 1A Low Dropout Regulator
LM2940T-8.0	NSC	获取价格	1A Low Dropout Regulator
LM2940T-8.0/A+	ETC	获取价格	Positive Fixed Voltage Regulator
LM2940T-8.0/B+	ETC	获取价格	Positive Fixed Voltage Regulator
LM2940T-8.0/NOPB	TI	获取价格	LM2940-N/LM2940C 1A Low Dropout Regulator
LM2940T-9.0	TI	获取价格	LM2940-N/LM2940C 1A Low Dropout Regulator
LM2940T-9.0	NSC	获取价格	1A Low Dropout Regulator
LM2940T-9.0/NOPB	TI	获取价格	LM2940-N/LM2940C 1A Low Dropout Regulator

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