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LP2951WG/883 PDF预览

LP2951WG/883

更新时间： 2024-11-09 22:10:39
品牌 Logo 应用领域
美国国家半导体 - NSC 稳压器调节器输出元件
页数 文件大小 规格书
26页 1200K
描述
Series of Adjustable Micropower Voltage Regulators

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LP2951WG/883 数据手册

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May 2005  
LP2950/LP2951  
Series of Adjustable Micropower Voltage Regulators  
(.05% typ.) and a very low output voltage temperature coef-  
ficient, making the part useful as a low-power voltage refer-  
ence.  
General Description  
The LP2950 and LP2951 are micropower voltage regulators  
with very low quiescent current (75µA typ.) and very low  
dropout voltage (typ. 40mV at light loads and 380mV at  
100mA). They are ideally suited for use in battery-powered  
systems. Furthermore, the quiescent current of the LP2950/  
LP2951 increases only slightly in dropout, prolonging battery  
life.  
Features  
n 5V, 3V, and 3.3V versions available  
n High accuracy output voltage  
n Guaranteed 100mA output current  
n Extremely low quiescent current  
n Low dropout voltage  
n Extremely tight load and line regulation  
n Very low temperature coefficient  
n Use as Regulator or Reference  
n Needs minimum capacitance for stability  
n Current and Thermal Limiting  
n Stable with low-ESR output capacitors (10mΩ to 6Ω)  
The LP2950-5.0 is available in the surface-mount D-Pak  
package, and in the popular 3-pin TO-92 package for pin-  
compatibility with older 5V regulators. The 8-lead LP2951 is  
available in plastic, ceramic dual-in-line, LLP, or metal can  
packages and offers additional system functions.  
One such feature is an error flag output which warns of a low  
output voltage, often due to falling batteries on the input. It  
may be used for a power-on reset. A second feature is the  
logic-compatible shutdown input which enables the regulator  
to be switched on and off. Also, the part may be pin-strapped  
for a 5V, 3V, or 3.3V output (depending on the version), or  
programmed from 1.24V to 29V with an external pair of  
resistors.  
LP2951 versions only  
n Error flag warns of output dropout  
n Logic-controlled electronic shutdown  
n Output programmable from 1.24 to 29V  
Careful design of the LP2950/LP2951 has minimized all  
contributions to the error budget. This includes a tight initial  
tolerance (.5% typ.), extremely good load and line regulation  
Block Diagram and Typical Applications  
LP2950  
LP2951  
00854625  
00854601  
© 2005 National Semiconductor Corporation  
DS008546  
www.national.com  
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