Datasheet > LM2990

LM2990

更新时间： 2024-11-23 12:18:39

品牌	Logo	应用领域
德州仪器 - TI		稳压器
页数	文件大小	规格书
20页	2002K
描述
LM2990 Negative Low Dropout Regulator

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LM2990 数据手册

LM2990

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SNVS093D –JUNE 1999–REVISED APRIL 2013

LM2990 Negative Low Dropout Regulator

Check for Samples: LM2990

FEATURES

DESCRIPTION

The LM2990 is a three-terminal, low dropout, 1

ampere negative voltage regulator available with fixed

output voltages of −5, −5.2, −12, and −15V.

•

5% Output Accuracy over Entire Operating

Range

•

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 an ensured worst-case maximum of 1V over the

entire operating temperature 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 ensured to ±5% over load,

and temperature extremes.

Dropout Voltage Typically 0.6V at 1A Load

Low Quiescent Current

Internal Short Circuit Current Limit

Internal Thermal Shutdown with Hysteresis

Functional Complement to the LM2940 Series

APPLICATIONS

•

Post Switcher Regulator

Local, On-Card, Regulation

Battery Operated Equipment

The LM2990 is short-circuit proof, and thermal

shutdown includes hysteresis to enhance the

reliability of the device when overloaded for an

extended period of time. The LM2990 is available in a

3-lead package and is rated for operation over the

automotive temperature range of −40°C to +125°C.

Typical Application

*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.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...20

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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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