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LM3881MME Datasheet(PDF) 1 Page - Texas Instruments

Part # LM3881MME
Description  LM3881 Power Sequencer
Download  17 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LM3881MME Datasheet(HTML) 1 Page - Texas Instruments

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Input Supply
(2.7 V ± 5.5V)
VCC
LM3881
FLAG1
GND
CADJ
EN
FLAG3
FLAG2
INV
TADJ
Flag1
Flag2
Flag3
VCC
LM3881
FLAG2
GND
EN
TADJ
FLAG1
FLAG3
INV
1
2
4
3
6
7
8
5
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
2
Easiest Method to Sequence Rails
method to control power up and power down of
Power Up and Power Down Control
multiple
power
supplies
(switching
or
linear
Input Voltage Range of 2.7V to 5.5V
regulators). By staggering the startup sequence, it is
possible to avoid latch conditions or large in-rush
Small Footprint VSSOP-8 Package
currents that can affect the reliability of the system.
Low Quiescent Current of 80 µA
Available
in
VSSOP-8
package,
the
Power
Output Invert Feature
Sequencer contains a precision enable pin and three
Timing Controlled by Small Value External
open drain output flags. Upon enabling the LM3881,
Capacitor
the three output flags will sequentially release, after
individual time delays, permitting the connected
APPLICATIONS
power supplies to startup. The output flags will follow
a reverse sequence during power down to avoid latch
Multiple Supply Sequencing
conditions. Time delays are defined using an external
Microprocessor / Microcontroller Sequencing
capacitor and the output flag states can be inverted
FPGA Sequencing
by the user.
Typical Application Circuit
Connection Diagram
Figure 1. Top View
VSSOP-8 Package
PIN DESCRIPTIONS
Pin #
Name
Function
1
VCC
Input Supply
2
EN
Precision Enable
3
GND
Ground
4
INV
Output Logic Invert
5
TADJ
Timer Adjust
6
FLAG3
Open Drain Output #3
7
FLAG2
Open Drain Output #2
8
FLAG1
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.
2
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2008–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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