Datasheet > LM2990

LM2990

更新时间： 2024-11-22 22:51:43

品牌	Logo	应用领域
美国国家半导体 - NSC		稳压器
页数	文件大小	规格书
12页	424K
描述
Negative Low Dropout Regulator

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中文翻译

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数据手册

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LM2990 数据手册

June 1999

LM2990

Negative Low Dropout Regulator

LM2990 is available in a 3-lead TO-220 package and is rated

for operation over the automotive temperature range of

−40˚C to +125˚C.

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.

Features

n 5% output accuracy over entire operating range

n Output current in excess of 1A

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

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

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_IN≤ 3V).

Output voltage accuracy is guaranteed to 5% over load,

and temperature extremes.

Applications

n Post switcher regulator

n Local, on-card, regulation

n Battery operated equipment

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

Typical Application

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

capacitor is recommended.

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

maintain regulation during transients. Locate the capacitor as close as possible to the regulator. The equivalent series resistance (ESR) is critical, and

should be less than 10Ω over the same operating temperature range as the regulator.

Ordering Information and Connection Diagrams

Temperature

Range

Output Voltage

Package

-5.0

-5.2

LM2990T-5.2

-12

-15

−40˚C to

+125˚C

LM2990T-5.0

LM2990S-5.0

LM2990T-12

LM2990S-12

LM2990T-15

LM2990S-15

TO-220

TO-263

−55˚C to

+125˚C

LM2990J-5.0-QML

5962-9571101QEA

LM2990J-12-QML

5962-9571001QEA

LM2990J-15-QML

5962-9570901QEA

J16A

LM2990WG5.0-QML

5962-9571101QXA

WG16A

DS010801

www.national.com

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中文翻译

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与LM2990相关器件

型号	品牌	获取价格	描述	数据表
LM2990-5.0MD8	TI	获取价格	LM2990QML Negative Low Dropout Regulator
LM2990-5.0MW8	TI	获取价格	LM2990QML Negative Low Dropout Regulator
LM2990J-12-QML	NSC	获取价格	Negative Low Dropout Regulator
LM2990J-15-QML	NSC	获取价格	Negative Low Dropout Regulator
LM2990J-5.0-QML	NSC	获取价格	Negative Low Dropout Regulator
LM2990QML	TI	获取价格	LM2990QML Negative Low Dropout Regulator
LM2990S-12	TI	获取价格	LM2990 Negative Low Dropout Regulator
LM2990S-12	NSC	获取价格	Negative Low Dropout Regulator
LM2990S-12/NOPB	TI	获取价格	LM2990 Negative Low Dropout Regulator
LM2990S-15	NSC	获取价格	Negative Low Dropout Regulator

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