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LM2991SEP

更新时间： 2024-11-23 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,SIP,5PIN,PLASTIC

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LM2991SEP 技术参数

是否Rohs认证： 不符合生命周期：Obsolete
包装说明：, SMSIP5H,.6,67TBReach Compliance Code：not_compliant
风险等级：5.92可调性：ADJUSTABLE
标称回动电压 1：0.6 VJESD-609代码：e0
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：3输出次数：1
端子数量：5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
封装主体材料：PLASTIC/EPOXY封装等效代码：SMSIP5H,.6,67TB
子类别：Other Regulators表面贴装：YES
技术：BIPOLAR端子面层：Tin/Lead (Sn85Pb15)
端子节距：1.7 mm端子位置：SINGLE
Base Number Matches：1

LM2991SEP 数据手册

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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 (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)  
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.  
© 2000 National Semiconductor Corporation  
DS011260  
www.national.com  
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