Datasheet > LM2991MWC

LM2991MWC

更新时间： 2024-11-26 21:14:31

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
12页	345K
描述
IC,VOLT REGULATOR,ADJUSTABLE,-2 TO -25V,BIPOLAR,WAFER

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LM2991MWC 技术参数

是否Rohs认证：	符合	生命周期：	Obsolete
包装说明：	, WAFER	Reach Compliance Code：	compliant
风险等级：	5.59	可调性：	ADJUSTABLE
标称回动电压 1：	0.6 V	最大电网调整率 (%/V)：	0.04
最大负载调整率 (%)：	0.4%	湿度敏感等级：	1
输出次数：	1	最大输出电流 1：	1 A
最大输出电压 1：	-25 V	最小输出电压 1：	-2 V
封装等效代码：	WAFER	认证状态：	Not Qualified
子类别：	Other Regulators	技术：	BIPOLAR
Base Number Matches：	1

LM2991MWC 数据手册

September 2000

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

= V

(1 + R2/R1)

OUT

REF

*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...12

中文翻译

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与LM2991MWC相关器件

型号	品牌	获取价格	描述	数据表
LM2991QML	NSC	获取价格	Negative Low Dropout Adjustable Regulator
LM2991QML	TI	获取价格	LM2991QML Negative Low Dropout Adjustable Regulator
LM2991S	TI	获取价格	LM2991 Negative Low Dropout Adjustable Regulator
LM2991S	NSC	获取价格	Negative Low Dropout Adjustable Regulator
LM2991S/NOPB	TI	获取价格	具有使能功能的 1A、负电压、可调节超低压降稳压器 \| KTT \| 5 \| -40 to
LM2991SEP	TI	获取价格	IC,VOLT REGULATOR,ADJUSTABLE,-2 TO -25V,BIPOLAR,SIP,5PIN,PLASTIC
LM2991SEP	NSC	获取价格	IC,VOLT REGULATOR,ADJUSTABLE,-2 TO -25V,BIPOLAR,SIP,5PIN,PLASTIC
LM2991SEP/NOPB	NSC	获取价格	IC,VOLT REGULATOR,ADJUSTABLE,-2 TO -25V,BIPOLAR,SIP,5PIN,PLASTIC
LM2991S-NOPB	TI	获取价格	LM2991 Negative Low Dropout Adjustable Regulator
LM2991SX	TI	获取价格	LM2991 Negative Low Dropout Adjustable Regulator

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