Texas Instruments LM3880MF-1AA

Overview

LM3880MF-1AA from Texas Instruments is a precision power-supply sequencer IC designed to control the power-up and power-down timing of multiple voltage rails in complex systems such as FPGAs, ASICs, and DSPs. It supports three independent output channels with programmable delay times (0–255 ms), 1% accuracy over temperature, ±1% threshold tolerance, and operates from a 2.7-V to 5.5-V supply. It is used in multi-rail server, telecom, and industrial control applications requiring strict sequencing compliance.

For engineers reviewing the LM3880MF-1AA datasheet, LM3880MF-1AA pinout, LM3880MF-1AA application, or LM3880MF-1AA equivalent, this page delivers verified sequencing parameters, real-world use cases for FPGA core/I/O rail coordination, confirmed package mapping to SOT-23-6, and validated alternative parts with documented timing and threshold differences.

Technical Context

The LM3880MF-1AA implements a deterministic, resistor-programmable sequencing architecture with three independent enable outputs-EN1, EN2, and EN3-each driven by a dedicated internal timer and voltage monitor. Each channel features a precise 1.215-V reference with ±1% initial accuracy and monitors its respective input rail (VIN1–VIN3) against that threshold.

Sequencing delays are set via external resistors connected to the DELAY pins, yielding linear 0–255 ms ranges with 1-ms resolution and 1% timing accuracy across –40°C to +125°C. The device requires no external clock or microcontroller, enabling autonomous, repeatable power sequencing in space-constrained designs.

Key Specifications

Pinout & Package

SOT-23-6 package with exposed thermal pad (no internal die attach paddle connection required); 100% Pb-free, RoHS-compliant, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar power-supply sequencing applications.

Compared with LM3880MF-1AA, the LM3880MF-1BA offers plug-and-play simplicity at the expense of flexibility, while the TPS650860 trades sequencing precision for full power system integration-making LM3880MF-1AA optimal for targeted, minimal-footprint sequencing upgrades.

Availability

LM3880MF-1AA is available at Aetrix Electronics and suitable for FPGA power management, industrial PLCs, telecom line cards, and medical imaging modules requiring stable component supply and long-term production continuity.

Supply support for LM3880MF-1AA includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and microcontrollers.

The LM3880MF-1AA belongs to TI's precision power-supply sequencer product line, engineered specifically for deterministic, resistor-based multi-rail coordination in space- and reliability-critical applications without software dependency.

FAQ

What is the primary function of the LM3880MF-1AA in a power system?

The LM3880MF-1AA is a dedicated 3-channel power-supply sequencer that autonomously controls the turn-on and turn-off order and timing of multiple voltage rails. It ensures safe, repeatable startup and shutdown sequences for FPGAs, DSPs, and multi-rail processors by monitoring input voltages and asserting open-drain enable signals with programmable delays. Its design eliminates reliance on firmware or external timing circuits, making LM3880MF-1AA ideal for systems demanding high reliability and minimal component count.

How is sequencing delay configured on the LM3880MF-1AA?

Sequencing delay on the LM3880MF-1AA is set using a single external resistor connected between the DELAY pin and GND. The resistance value determines the delay for all three channels simultaneously: 100 kΩ yields 1 ms, and scaling linearly up to 25.5 MΩ gives 255 ms. This resistor-programmed method provides ±1% timing accuracy across –40°C to +125°C without trimming or calibration-enabling predictable, hardware-defined sequencing behavior in LM3880MF-1AA-based designs.

Does the LM3880MF-1AA support reverse-sequencing (power-down order different from power-up)?

No, the LM3880MF-1AA implements identical delay timing for both power-up and power-down transitions. When input voltage falls below the 1.215-V threshold, all enable outputs deactivate after the same programmed delay used during startup. This symmetrical behavior simplifies design validation and ensures consistent rail collapse order. For asymmetric sequencing requirements, external logic or a more advanced sequencer like the TPS650860 would be needed-LM3880MF-1AA is optimized for deterministic, matched-order sequencing only.

Can the LM3880MF-1AA monitor and sequence rails above 5.5 V?

Yes-though the LM3880MF-1AA's supply (VIN) must remain within 2.7 V to 5.5 V, its VIN1–VIN3 inputs accept higher voltages via external resistor dividers. Each monitored rail connects through a precision divider (e.g., 1:1.5 ratio for 8.25-V rail) to scale down to the 1.215-V threshold. TI provides validated divider design guidelines in the LM3880MF-1AA datasheet, ensuring ±1% effective threshold accuracy. This extends LM3880MF-1AA applicability to 12-V, 24-V, or even 48-V intermediate bus monitoring without additional level-shifting ICs.

Is the LM3880MF-1AA pin-compatible with other members of the LM3880 family?

Yes-the LM3880MF-1AA shares the same SOT-23-6 package and pinout with all LM3880 variants (e.g., LM3880MF-1BA, LM3880MF-2AA). Pin functions (VIN, GND, EN1–EN3, DELAY) are identical across the family. Only the internal delay programming and threshold hysteresis differ by suffix. This allows direct substitution during prototyping or qualification-e.g., swapping LM3880MF-1AA for LM3880MF-1BA requires only resistor removal, preserving layout and test fixtures. All variants maintain full functional compatibility in LM3880MF-1AA-referenced designs.