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LM3881

National Semiconductor
Part Number LM3881
Manufacturer National Semiconductor
Description Power Sequencer
Published May 14, 2010
Detailed Description LM3881 Power Sequencer February 6, 2008 LM3881 Power Sequencer General Description The LM3881 Power Sequencer offers t...
Datasheet PDF File LM3881 PDF File

LM3881
LM3881

Overview
LM3881 Power Sequencer February 6, 2008 LM3881 Power Sequencer General 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.
Available in MSOP-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 www.
DataSheet4U.
com 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.
Features ■ ■ ■ ■ ■ ■ ■ Easiest method to sequence rails Power up and power down control Input voltage range of 2.
7V to 5.
5V Small footprint MSOP-8 package Low quiescent current of 80 µA Output invert feature Timing controlled by small value external capacitor Applications ■ Multiple Supply Sequencing ■ Microprocessor / Microcontroller Sequencing ■ FPGA Sequencing Typical Application Circuit 30048401 © 2008 National Semiconductor Corporation 300484 www.
national.
com LM3881 Connection Diagram 30048402 Top View MSOP-8 Package Ordering Information Order Number www.
DataSheet4U.
com LM3881MM Package Type MSOP-8 NSC Package Drawing MUA08A Supplied As 1000 Units on Tape and Reel 3500 Units on Tape and Reel LM3881MMX Pin Descriptions Pin # 1 2 3 4 5 6 7 8 Name VCC EN GND INV TADJ FLAG3 FLAG2 FLAG1 Function Input Supply Precision Enable Ground Output Logic Invert Timer Adjust Open Drain Output #3 Open Drain Output #2 Open Drain Output #1 www.
national.
com 2 LM3881 Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sale...


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