Analog Devices Inc./Maxim Integrated MAX8881EUT30-T

Overview

MAX8881EUT30-T from Maxim Integrated is a fixed-output, ultra-low-quiescent-current LDO linear regulator delivering 3.3V at up to 200mA with ±1.5% output voltage accuracy, 3.5µA supply current at 12V input, and integrated reverse-battery protection - designed for long-life battery-powered smoke detectors and real-time clock backup power systems.

For engineers reviewing the MAX8881EUT30-T datasheet, MAX8881EUT30-T pinout, MAX8881EUT30-T application, or MAX8881EUT30-T equivalent, key selection criteria include dropout voltage (100–200mV at 50mA), POK open-drain fault indicator timing, thermal shutdown threshold (+160°C), and compatibility with 1µF input / 4.7µF output ceramic capacitors in space-constrained SOT23-6 layouts.

Technical Context

The MAX8881EUT30-T integrates a 2Ω PMOS pass transistor and a precision 1.25V internal reference to achieve low dropout and stable regulation without external feedback components. Its error amplifier compares the internal reference against the FB-to-OUT connection to maintain 3.3V output under load variations from 10µA to 200mA.

Reverse battery protection limits IN-to-GND reverse leakage to <1mA when VIN < 0V, while the open-drain POK output asserts low when VOUT drops >10% below nominal or during shutdown - enabling simple system-level fault detection without external logic.

Key Specifications

Pinout & Package

MAX8881EUT30-T is packaged in a 6-pin SOT23-6 (JEDEC MO-178AA) with exposed pad not present; footprint compatible with standard SOT23 pick-and-place equipment and reflow profiles.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output LDO regulator applications.

Compared with TPS78033DRVR and MCP1703T-3302E/MB, the MAX8881EUT30-T uniquely balances ultra-low IQ, 200mA drive, reverse-battery hardening, and integrated POK - making it optimal for safety-critical, long-life battery systems where reliability trumps minimal quiescent current alone.

Availability

MAX8881EUT30-T is available at Aetrix Electronics and suitable for smoke detectors, real-time clocks, smart battery packs, and remote transmitters requiring stable component supply across extended production lifecycles.

Supply support for MAX8881EUT30-T 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

Maxim Integrated (now part of Analog Devices) designs high-performance analog and mixed-signal ICs for power management, sensing, and communication in constrained environments.

The MAX8880/MAX8881 family was engineered specifically for battery-powered safety and timing applications demanding ultra-low IQ, reverse-polarity resilience, and integrated fault reporting - not general-purpose regulation.

FAQ

What is the maximum output current capability of the MAX8881EUT30-T?

The MAX8881EUT30-T delivers up to 200mA continuous output current with thermal and short-circuit protection active. At 50mA load, its dropout voltage is typically 100mV, enabling efficient operation near battery end-of-life. The device enters foldback current limiting during sustained short circuits, limiting peak output to approximately 250mA at VIN = 5V to prevent damage.

Does the MAX8881EUT30-T require external resistors to set the output voltage?

No, the MAX8881EUT30-T does not require external resistors. It is factory preset to 3.3V with internal precision feedback resistors; the FB pin is internally tied to OUT. This eliminates component count and layout sensitivity versus adjustable regulators like the MAX8880, simplifying design for fixed-rail applications.

How does the POK output function on the MAX8881EUT30-T?

The POK output on the MAX8881EUT30-T is an open-drain signal that pulls low when the 3.3V output falls more than 10% below nominal (i.e., <2.97V) or when the device is in shutdown. During normal regulation, POK is high-impedance. A pull-up resistor is required; adding a capacitor in parallel creates a programmable delay for reset timing - directly supporting microcontroller boot sequencing without external supervisors.

Can the MAX8881EUT30-T operate with input voltages below 3.3V?

No, the MAX8881EUT30-T requires a minimum input voltage of 2.5V but cannot regulate 3.3V output when VIN < 3.4V due to dropout. Its specified dropout is 100–200mV at 50mA, meaning VIN must exceed 3.4V to sustain 3.3V output under load. Below this, VOUT collapses linearly with VIN - a behavior confirmed in the "Output Voltage vs. Input Voltage" graph (Figure MAX8880/1-09).

What package type is used for the MAX8881EUT30-T?

The MAX8881EUT30-T uses a 6-pin SOT23-6 package (JEDEC MO-178AA), with pinout identical to standard SOT23 footprints. It has no exposed thermal pad. Dimensions are 2.9mm × 2.9mm × 1.45mm, compatible with automated assembly and reflow soldering per IPC-J-STD-020.