LM2991

更新时间： 2024-11-23 12:09:43

品牌	Logo	应用领域
德州仪器 - TI		稳压器
页数	文件大小	规格书
19页	2011K
描述
LM2991 Negative Low Dropout Adjustable Regulator

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LM2991 数据手册

LM2991

www.ti.com

SNVS099H –MAY 1999–REVISED JUNE 2013

LM2991 Negative Low Dropout Adjustable Regulator

Check for Samples: LM2991

FEATURES

DESCRIPTION

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.

•

Output Voltage Adjustable from −3V to −24V,

Typically −2V to −25V

•

Output Current in Excess of 1A

Dropout Voltage Typically 0.6V at 1A Load

Low Quiescent Current

The LM2991 uses new circuit design techniques to

provide a low dropout voltage, low quiescent current

and low temperature coefficient precision reference.

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 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).

Internal Short Circuit Current Limit

Internal Thermal Shutdown with Hysteresis

TTL, CMOS Compatible ON/OFF Switch

Functional Complement to the LM2941 Series

APPLICATIONS

•

Post Switcher Regulator

Local, On-Card, Regulation

Battery Operated Equipment

The LM2991 is short-circuit proof, and thermal

shutdown includes hysteresis to enhance the

reliability of the device when inadvertently overloaded

for extended periods. The LM2991 is available in 5-

lead TO-220 and DDPAK/TO-263 packages and is

rated for operation over the automotive temperature

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

available.

Typical Application

V_OUT= V_REF(1 + R2/R1)

*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...19

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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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