Product details


Supply voltage (Min) (V) 2.7 Number of supplies monitored 3 Supply voltage (Max) (V) 5.5 Iq (Typ) (uA) 80 Time delay (ms) Adjustable Number of sequenced outputs 3 Rating Catalog open-in-new Find other Sequencers

Package | Pins | Size

VSSOP (DGK) 8 15 mm² 3 x 4.9 open-in-new Find other Sequencers


  • 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
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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.

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Technical documentation

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Type Title Date
* Data sheet LM3881 Simple Power Sequencer With Adjustable Timing datasheet (Rev. D) Dec. 10, 2014
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Technical article How to manage processor power during uncontrolled power off Jun. 21, 2018
Technical article Sequencing solutions: simple, reliable and cost-effective Sep. 27, 2017
Technical article Sequencing and managing multiple power rails in a system: common questions answered Feb. 01, 2017
Technical article A simple six-channel power-rail sequencing solution Nov. 16, 2015
Application note Power-supply sequencing for FPGAs Oct. 24, 2014
User guide AN-1785 LM3881 Power Sequencer Evaluation Board (Rev. C) May 07, 2013
Application note Power Supply Design Considerations for Modern FPGAs (Power Designer 121) Feb. 02, 2010

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

document-generic User guide

The LM3881 evaluation board has been designed to connect directly to the power supplies of an existing system to enable sequencing. Upon enabling the device, the three open drain output flags will rise in sequential order, 1-2-3. Once the part is disabled, the shutdown sequence will occur in reverse (...)

  • Power up and power down control
  • Input voltage range of 2.7 V to 5.5 V
  • Small footprint SOT23-6
  • Low quiescent current of 20 mA
  • Capacitor controlled timing options

Design tools & simulation

PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

Reference designs

High efficiency power supply architecture reference design for protection relay processor module
TIDA-010011 — This reference design showcases various power architectures for generating multiple voltage rails for an application processor module, requiring >1A load current and high efficiency . The required power supply is generated using 5-, 12- or 24-V DC input from the backplane. Power supplies are (...)
document-generic Schematic
12mm x 12mm, 5-Rail Power Sequencing for Application Processors Reference Design
TIDA-01568 — This reference design demonstrates a validated and cost competitive power sequencing solution for an application processor or a high performance control platform. This design supports 5 different voltage rails, optimized with layout space of 12 mm × 12 mm. The design is also capable of (...)
document-generic Schematic
Low-Voltage, Low-Noise Power-Supply Reference Design for Ultrasound Front End
TIDA-01466 — This reference design is a power supply optimized specifically for providing power to eight 16-channel receive AFE ICs for ultrasound imaging systems. This design reduces part count while maximizing efficiency by using single-chip DC-DC converter + LDO combo regulators to set the LDO input just (...)
document-generic Schematic
Power Reference Design for Xilinx® Zynq®-7000
PMP7877 The PMP7877 reference design provides all the rails necessary to power a Xilinx® Zynq®-7000 series SoC.  It operates from an input voltage range of 10.8Vin to 13.2Vin and has seven regulated outputs: 1Vout @ 5A, 1.8Vout @ 2.5A, 1.5Vout @ 6A, 3.3Vout @ 5A, 3.3Vout @ 5A, 5Vout @ 2A, and (...)
document-generic Schematic
30A SIMPLE SWITCHER® Power Module with 3 to 14.5V Reference Design with PMBus
PMP9464 The reference design PMP9464 utilizes the LMZ31530, a 30A SIMPLE SWITCHER® Power Module. The LMZ31530 SIMPLE SWITCHER® power module is an easy-to-use integrated power solution that combines a 30-A DC/DC converter with power MOSFETs, a shielded inductor, and passives into a low profile, QFN package.


document-generic Schematic

CAD/CAE symbols

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VSSOP (DGK) 8 View options

Ordering & quality

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