LM2991

更新时间： 2024-11-22 22:55:47

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
11页	341K
描述
Negative Low Dropout Adjustable Regulator

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中文翻译

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LM2991 数据手册

May 1999

LM2991

Negative Low Dropout Adjustable Regulator

General Description

Features

n Output voltage adjustable from −3V to −24V, typically

−2V to −25V

The LM2991 is a low dropout adjustable negative regulator

with a output voltage range between −3V to −24V. The

LM2991 provides up to 1A of load current and features a On

/Off pin for remote shutdown capability.

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 TTL, CMOS compatible ON/OFF switch

n Functional complement to the LM2941 series

The LM2991 uses new circuit design techniques to provide a

low dropout voltage, low quiescent current and low tempera-

ture coefficient precision reference. 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

a 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).

Applications

n Post switcher regulator

n Local, on-card, regulation

n Battery operated equipment

The LM2991 is short-circuit proof, and thermal shutdown in-

cludes hysteresis to enhance the reliability of the device

when inadvertently overloaded for extended periods. The

LM2991 is available in 5-lead TO-220 and TO-263 packages

and is rated for operation over the automotive temperature

range of −40˚C to +125˚C. Mil-Aero versions are also avail-

able.

Typical Application

DS011260-1

(1 + R2/R1)

REF

OUT

*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.

DS011260

www.national.com

12 3 4 5 6 7...11

中文翻译

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与LM2991相关器件

型号	品牌	获取价格	描述	数据表
LM2991 MD8	TI	获取价格	负低压降可调节稳压器 \| Y \| 0 \| -55 to 125
LM2991 MWC	TI	获取价格	负低压降可调节稳压器 \| YS \| 0 \| -40 to 85
LM2991_00	NSC	获取价格	Negative Low Dropout Adjustable Regulator
LM2991GW-QML	TI	获取价格	LM2991QML Negative Low Dropout Adjustable Regulator
LM2991J	NSC	获取价格	Negative Low Dropout Adjustable Regulator
LM2991J-QML	TI	获取价格	3 V-24V ADJUSTABLE NEGATIVE LDO REGULATOR, 1V DROPOUT, CDIP16, CERAMIC, DIP-16
LM2991J-QML	NSC	获取价格	Negative Low Dropout Adjustable Regulator
LM2991J-QMLV	TI	获取价格	3 V-24V ADJUSTABLE NEGATIVE LDO REGULATOR, 1V DROPOUT, CDIP16, CERAMIC, DIP-16
LM2991J-QMLV	NSC	获取价格	Negative Low Dropout Adjustable Regulator
LM2991MD8	NSC	获取价格	IC VREG 3 V-24 V ADJUSTABLE NEGATIVE LDO REGULATOR, 1 V DROPOUT, UUC, DIE, Adjustable Nega

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