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LP3997

更新时间： 2024-11-24 11:14:43
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德州仪器 - TI 稳压器
页数 文件大小 规格书
18页 1038K
描述
具有电源正常指示和使能功能的 250mA、低压降稳压器

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LP3997 数据手册

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LP3997  
www.ti.com  
SNVS272B –MAY 2004–REVISED MAY 2013  
Micropower 250-mA CMOS LDO Regulator With Error Flag and Power-On-Reset  
Check for Samples: LP3997  
1
FEATURES  
DESCRIPTION  
The LP3997 regulator is designed to meet the  
requirements of portable, battery-powered systems,  
providing accurate output voltage, low noise, and low  
quiescent current. The LP3997 provides 3.3V output  
at up to 250mA load current. The chip architecture is  
capable of providing output voltages as low as 0.8V.  
When switched in shutdown mode, the power  
consumption is virtually zero.  
2
•
Low 140-mV Dropout at 250-mA Load  
Stable With Ceramic Capacitor.  
Low Noise With Bypass Capacitor  
Less Than 80 µA Typical IQ at 250 mA  
Virtually Zero IQ (Disabled)  
•
•
•
•
•
•
•
Thermal and Short Circuit Protection  
(1)  
3.3-V Output  
The LP3997 is designed to be stable with space  
saving ceramic output capacitor as small as 1µF.  
(2)  
8-Lead VSSOP Package  
The LP3997 also includes an out-of-regulation error  
flag. When the output is more than 5% below its  
nominal voltage, the error flag sets to low. If a  
capacitor is connected to device’s delay pin, a  
delayed power-on reset signal will be generated.  
APPLICATIONS  
•
•
•
•
•
Portable Consumer Electronics  
Cellular Handsets  
Laptop and Palm Computers  
PDAs  
Digital Cameras  
(1) For other voltage options, contact your TI sales office  
(2) For other package options, contact your TI sales office.  
Typical Application Circuit  
4
5
V
V
IN  
V
OUT  
IN  
V
OUT  
6
8
2
SENSE  
ERROR  
SD  
Enable  
470k  
LP3997  
7
Error/POR  
DELAY  
1
C
BYP  
GND  
3
0.1 mF  
2.2 mF  
0.1 mF  
2.2 mF  
1
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.  
2
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.  
Copyright © 2004–2013, Texas Instruments Incorporated  
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