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LM2991MDS

更新时间： 2024-11-26 21:06:23
品牌 Logo 应用领域
美国国家半导体 - NSC 输出元件调节器
页数 文件大小 规格书
11页 337K
描述
IC VREG 3 V-24 V ADJUSTABLE NEGATIVE LDO REGULATOR, 1 V DROPOUT, UUC, DIE, Adjustable Negative Single Output LDO Regulator

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LM2991MDS 技术参数

生命周期：Transferred包装说明：DIE, DIE OR CHIP
Reach Compliance Code：unknownECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.18
可调性：ADJUSTABLE最大回动电压 1：1 V
标称回动电压 1：0.6 VJESD-30 代码：X-XUUC-N
最大电网调整率 (%/V)：0.04最大负载调整率 (%)：0.4%
功能数量：1输出次数：1
工作温度TJ-Max：125 °C工作温度TJ-Min：-40 °C
最大输出电流 1：1 A最大输出电压 1：24 V
最小输出电压 1：3 V封装主体材料：UNSPECIFIED
封装代码：DIE封装等效代码：DIE OR CHIP
封装形状：UNSPECIFIED封装形式：UNCASED CHIP
认证状态：Not Qualified调节器类型：ADJUSTABLE NEGATIVE SINGLE OUTPUT LDO REGULATOR
筛选级别：38535V;38534K;883S子类别：Other Regulators
表面贴装：YES技术：BIPOLAR
端子形式：NO LEAD端子位置：UPPER
Base Number Matches：1

LM2991MDS 数据手册

 浏览型号LM2991MDS的Datasheet PDF文件第2页浏览型号LM2991MDS的Datasheet PDF文件第3页浏览型号LM2991MDS的Datasheet PDF文件第4页浏览型号LM2991MDS的Datasheet PDF文件第5页浏览型号LM2991MDS的Datasheet PDF文件第6页浏览型号LM2991MDS的Datasheet PDF文件第7页 
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 (VOUT − VIN ≤ 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
V
(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.  
© 1999 National Semiconductor Corporation  
DS011260  
www.national.com  
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