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LM3880MF-1AE/NOPB

3-rail power sequencer, open-drain outputs, fixed delay, SOT-23-6, cascadable

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Manufacturer Part：

LM3880MF-1AE/NOPB

Package：

SOT-23-6 (2.9 × 1.6 × 1.0 mm)

Brand：

Product Categories：

Integrated Circuits ICs, Power Management ICs (PMIC)

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Description

Product Overview

The LM3880MF-1AE/NOPB is a three-rail simple power sequencer from Texas Instruments, packaged in a 6-pin SOT-23 (DBV) package. It provides open-drain sequenced output flags with fixed time delays for controlling the power-up and power-down order of multiple voltage rails, preventing latch-up conditions and excessive inrush currents in FPGA, DSP, and multi-rail systems.

Key Specifications

Function	3-Rail Power Sequencer
Sequenced Outputs	3 (open-drain flags)
Input Voltage	2.7V to 5.5V
Quiescent Current	25 µA (typical)
Time Delay Options	2, 10, 16, 30, 60, 120 ms (fixed per part number)
Output Type	Open-drain
Cascadable	Yes — up to 3 devices for 9 rails
Sequence Logic	Power-up and reverse power-down
Package	SOT-23-6 (2.9 × 1.6 mm)
Operating Temperature	-40°C to +125°C

Features

Three open-drain sequenced output flags for EN/PG control
Fixed time delay between each rail (device-specific)
Power-up sequence: OUT1→OUT2→OUT3; reverse order power-down
Cascadable: chain up to 3 devices for 9-rail sequencing
Precision enable input for system-level control
Ultra-low 25 µA quiescent current

Applications

FPGA power-up sequencing (VCCINT, VCCAUX, VCCIO)
DSP and processor multi-rail power sequencing
Multi-voltage LDO and DC-DC enable control
Preventing latch-up in mixed-voltage ASIC designs
Server platform VRM power-on sequencing

Product Introduction:LM3880MF-1AE/NOPB Product Introduction

The LM3880 is a simple three-rail power sequencer that controls the power-up and power-down order of multiple voltage rails in FPGA, DSP, and multi-rail systems. It provides three open-drain output flags that sequentially assert low during power-up (OUT1, then OUT2, then OUT3) with a fixed time delay between each, and de-assert in reverse order during power-down. This sequencing prevents latch-up conditions, reduces inrush current, and ensures that I/O rails are powered before or after core rails as required by the device manufacturer. The device is cascadable — up to three LM3880 devices can be chained to sequence up to nine rails. The fixed delay is determined by the part number suffix and ranges from 2 ms to 120 ms.

Working Principle:LM3880MF-1AE/NOPB Working Principle

The LM3880 operates as a state machine that controls three open-drain output flags in a timed sequence. When the enable (EN) pin is driven high and the input voltage (VDD) exceeds the UVLO threshold, the internal controller begins the power-up sequence. OUT1 pulls low first, signaling the first rail’s enable. After the programmed delay (set by the part number suffix), OUT2 pulls low, enabling the second rail. After another delay, OUT3 pulls low, enabling the third rail. When EN is driven low or VDD drops below UVLO, the power-down sequence begins in reverse: OUT3 releases first (goes high-impedance), then after the delay OUT2, then OUT1. This reverse-order shutdown ensures that I/O rails remain powered while the core rail discharges, preventing latch-up. The open-drain outputs can directly drive the EN pins of LDOs or DC-DC converters, or drive external P-channel MOSFETs for load-switch control.

Pin Description:LM3880MF-1AE/NOPB Pin Definition and Functions

Pin	Name	Type	Function
1	VDD	Power	Input supply (2.7-5.5V)
2	GND	Power	Ground
3	EN	Input	Enable — drive high to start power-up sequence
4	OUT3	Output	Sequenced output 3 — open-drain (last to assert)
5	OUT2	Output	Sequenced output 2 — open-drain (second to assert)
6	OUT1	Output	Sequenced output 1 — open-drain (first to assert)

Application Scenarios:In which products and applications isLM3880MF-1AE/NOPB used

Intel/AMD FPGA power sequencing: VCCINT→VCCAUX→VCCIO with controlled delay
Multi-core DSP rail sequencing: core→DDR→I/O with reverse shutdown
ASIC design power-up order enforcement to prevent latch-up
Portable equipment multi-LDO enable control with defined power-on order

Alternative Models:What chips are recommended as replacements for LM3880MF-1AE/NOPB

Manufacturer	Part Number	Package	Notes
TI	TPS386000RGPR	VQFN-16	Quad voltage supervisor with sequencer
TI	LM3880MF-3AE/NOPB	SOT-23-6	Same device, different delay time suffix
ADI	ADM1186	QSOP-16	Quad voltage sequencer/monitor
Maxim	MAX6820	TDFN-10	4-channel sequencer, adjustable timing
Renesas	ISL88714	TQFN-24	8-rail programmable sequencer