LM3881 3 rail simple power sequencer with adjustable time delay | TI.com

LM3881
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3 rail simple power sequencer with adjustable time delay

 

Description

The LM3881 Simple Power Sequencer offers the easiest method to control power up and power down of multiple power supplies (switching or linear regulators). By staggering the start-up sequence, it is possible to avoid latch conditions or large inrush currents that can affect the reliability of the system.

Available in VSSOP-8 package, the Simple Sequencer contains a precision enable pin and three open-drain output flags. When the LM3881 is enabled, the three output flags will sequentially release, after individual time delays, thus permitting the connected power supplies to start up. 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
  • Tiny Footprint
  • Low Quiescent Current of 80 µA
  • Input Voltage Range of 2.7 V to 5.5 V
  • Output Invert Feature
  • Timing Controlled by Small Value External
    Capacitor

Design with LM3881

  Range
Vcc  V 2.70 to 5.50V
Number of Flags
Flag Delay  ms

/webdocs/htdocs-webench-8888/appinfo/webench/scripts/template/sequencer

Parametrics

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Part number Order Number of supplies monitored VCC (Min) (V) VCC (Max) (V) Iq (Typ) (uA) Time delay (ms) Number of sequenced outputs Rating Package Group Package size: mm2:W x L (PKG)
LM3881 Order now 3     2.7     5.5     80     Adjustable     3     Catalog     VSSOP | 8     8VSSOP: 15 mm2: 4.9 x 3 (VSSOP | 8)    
LM3880 Order now   2.7     5.5     25     2
10
16
30
60
120    
3     Catalog     SOT-23 | 6     6SOT-23: 5 mm2: 1.6 x 2.9 (SOT-23 | 6)    
LM3880-Q1 Order now 3     2.7     5.5     25     2
10
16
30
60
120    
3     Automotive     SOT-23 | 6     6SOT-23: 5 mm2: 1.6 x 2.9 (SOT-23 | 6)