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National Semiconductor
National Semiconductor

LM3880 Datasheet

Power Sequencer


LM3880 Datasheet Preview


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September 2006
LM3880
Power Sequencer
General Description
The LM3880 Power Sequencer offers the easiest method to
control power up and power down of multiple power supplies
(switchers 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 a SOT23-6 package, the Power Sequencer
contains a precision enable pin and three open drain output
flags. Upon enabling the LM3880 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.
Standard timing option of 30ms is available.
EPROM capability allows every delay and sequence to be
fully adjustable. Contact National Semiconductor if a non-
standard configuration is required.
Features
n Easiest method to sequence rails
n Power up and power down control
n Input voltage range of 2.7V to 5.5V
n Small footprint SOT23-6
n Low quiescent current of 20 µA
n Standard timing options available
n Customization of timing and sequence available through
factory programmability
Applications
n Multiple supply sequencing
n Microprocessor / Microcontroller sequencing
n FPGA sequencing
Typical Application Circuit
20192601
© 2006 National Semiconductor Corporation DS201926
www.national.com
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Connection Diagram
Pin Descriptions
Pin #
1
2
3
4
5
6
Name
VCC
GND
EN
FLAG3
FLAG2
FLAG1
Ordering Information
20192602
Top View
SOT23–6 Package
Function
Input supply
Ground
Precision enable pin
Open drain output #3
Open drain output #2
Open drain output #1
Sequence Number
1
2
3
4
5
6
See timing diagrams for more information
20192603
Sequence Designator Table
Power Up
1-2-3
1-2-3
1-2-3
1-2-3
1-2-3
1-2-3
Flag Order
Power Down
3-2-1
3-1-2
2-3-1
2-1-3
1-3-2
1-2-3
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2
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Ordering Information (Continued)
Timing
Designator
AA
td1
10ms
AB 30ms
AC 60ms
AD 120ms
See timing diagrams for more information
Timing Designator Table
td2
10ms
30ms
60ms
120ms
td3
10ms
30ms
60ms
120ms
td4
10ms
30ms
60ms
120ms
td5
10ms
30ms
60ms
120ms
td6
10ms
30ms
60ms
120ms
LM3880 Ordering Information
Timer settings
Sequence
Order Number td1 td2 td3 td4 td5 td6
LM3880MF-1AB 30ms 30ms 30ms 30ms 30ms 30ms
Order
1
Supplied As
1k units T&R
LM3880MFX-1AB 30ms 30ms 30ms 30ms 30ms 30ms 1 3k units T&R
Non-standard parts are available upon request. Please contact National Semiconductor for more information.
Package
Type
SOT23-6
SOT23-6
NSC
Package
Drawing
MF06A
MF06A
Package
Marking
F21A
F21A
3 www.national.com
Page 3
Part Number LM3880
Manufactur National Semiconductor
Description Power Sequencer
Total Page 12 Pages
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