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LM3881MME-NOPB

更新时间： 2024-09-09 12:04:39
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LM3881 Power Sequencer

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LM3881  
www.ti.com  
SNVS555C –JANUARY 2008–REVISED APRIL 2013  
LM3881 Power Sequencer  
Check for Samples: LM3881  
1
FEATURES  
DESCRIPTION  
The LM3881 Power Sequencer offers the easiest  
method to control power up and power down of  
multiple power supplies (switching or linear  
regulators). By staggering the startup sequence, it is  
possible to avoid latch conditions or large in-rush  
currents that can affect the reliability of the system.  
2
•
•
•
•
•
•
•
Easiest Method to Sequence Rails  
Power Up and Power Down Control  
Input Voltage Range of 2.7V to 5.5V  
Small Footprint VSSOP-8 Package  
Low Quiescent Current of 80 µA  
Output Invert Feature  
Available in VSSOP-8 package, the Power  
Sequencer contains a precision enable pin and three  
open drain output flags. Upon enabling the LM3881,  
the three output flags will sequentially release, after  
individual time delays, permitting the connected  
power supplies to startup. The output flags will follow  
a reverse sequence during power down to avoid latch  
conditions. Time delays are defined using an external  
capacitor and the output flag states can be inverted  
by the user.  
Timing Controlled by Small Value External  
Capacitor  
APPLICATIONS  
•
•
•
Multiple Supply Sequencing  
Microprocessor / Microcontroller Sequencing  
FPGA Sequencing  
Typical Application Circuit  
Connection Diagram  
Input Supply  
(2.7 Vœ 5.5V)  
8
7
6
1
2
3
VCC  
FLAG1  
FLAG2  
LM3881  
EN  
GND  
INV  
LM3881  
FLAG3  
TADJ  
VCC  
4
5
EN  
Flag1  
Flag2  
Flag3  
FLAG1  
FLAG2  
INV  
FLAG3  
TADJ  
Figure 1. Top View  
VSSOP-8 Package  
GND  
CADJ  
PIN DESCRIPTIONS  
Pin #  
Name  
Function  
1
2
3
4
5
6
7
8
VCC  
Input Supply  
EN  
Precision Enable  
Ground  
GND  
INV  
Output Logic Invert  
Timer Adjust  
TADJ  
FLAG3  
FLAG2  
FLAG1  
Open Drain Output #3  
Open Drain Output #2  
Open Drain Output #1  
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 © 2008–2013, Texas Instruments Incorporated  
1234567...17

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