Analog Devices Inc./Maxim Integrated MAX8881EUT33+T

Overview

MAX8881EUT33+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, and reverse battery protection - designed for long-life battery-powered systems such as smoke detectors and smart battery packs.

For engineers reviewing the MAX8881EUT33+T datasheet, MAX8881EUT33+T pinout, MAX8881EUT33+T application, or MAX8881EUT33+T equivalent, key selection criteria include dropout voltage (100–200mV at 50mA), POK open-drain fault indicator, thermal shutdown at 160°C, and SOT23-6 package compatibility with 2.5V–12V input range.

Technical Context

The MAX8881EUT33+T uses an internal 1.25V reference and error amplifier to regulate its factory-set 3.3V output via direct FB-to-OUT connection, eliminating external feedback resistors. Its 2Ω PMOS pass transistor enables ultra-low IQ across full load and dropout conditions without base-drive losses.

Reverse battery protection limits IN-to-GND reverse current to <1mA by disconnecting internal circuitry when VIN < 0V. The open-drain POK output asserts low when VOUT drops >10% below regulation or during shutdown, supporting system-level fault detection and delayed reset functions.

Key Specifications

Pinout & Package

MAX8881EUT33+T is housed in a 6-pin SOT23-6 package (JEDEC MO-178AA, 2.9mm × 2.8mm × 1.3mm) with exposed pad not present - compatible with standard reflow profiles and manual soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS78033QDSERQ1 and MCP1700T-3302E/MB, the MAX8881EUT33+T uniquely balances ultra-low IQ, integrated reverse battery protection, POK signaling, and 12V input capability - making it optimal for high-reliability, long-life consumer and industrial battery systems without automotive certification needs.

Availability

MAX8881EUT33+T is available at Aetrix Electronics and suitable for smoke detectors, battery-powered alarms, remote transmitters, smart battery packs, and real-time clock backup power requiring stable component supply across extended production lifecycles.

Supply support for MAX8881EUT33+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 precision analog and mixed-signal ICs for power management, sensing, and communication in harsh, battery-constrained environments.

The MAX8880/MAX8881 family was engineered specifically for ultra-long-life battery applications demanding sub-5µA quiescent current, reverse polarity resilience, and reliable power-good signaling - targeting safety-critical and maintenance-free portable electronics.

FAQ

What is the maximum input voltage rating for the MAX8881EUT33+T?

The MAX8881EUT33+T supports an absolute maximum input voltage of +14V relative to GND, but its specified operational input range is 2.5V to 12V. Operating above 12V may cause excessive power dissipation or violate thermal limits, especially at high load currents. For reliable 3.3V regulation, keep VIN ≤12V per the Electrical Characteristics table.

Does the MAX8881EUT33+T require external feedback resistors to set its output voltage?

No, the MAX8881EUT33+T does not require external feedback resistors. It is a factory-preset 3.3V regulator with internal precision resistors connecting the FB pin directly to OUT. The FB pin must be tied to OUT externally per the Pin Description - no resistor divider is needed or used in this variant.

How does the POK output function on the MAX8881EUT33+T?

The POK output on the MAX8881EUT33+T is an open-drain signal that pulls low when the regulated 3.3V output falls more than 10% below nominal (i.e., below ~2.97V) or when the device is in shutdown. During normal regulation, POK is high-impedance and requires an external pull-up resistor to monitor system power health or trigger a reset.

Can the MAX8881EUT33+T be used with a 1µF output capacitor?

Yes, the MAX8881EUT33+T remains stable with a 1µF output capacitor, but only for load currents up to 40mA. For full 200mA operation, a 4.7µF ceramic capacitor with ESR <0.5Ω is required per the Applications Information section. Using 1µF at 200mA risks instability, overshoot, or poor transient response.

What protection features are built into the MAX8881EUT33+T?

The MAX8881EUT33+T integrates reverse battery protection (<1mA reverse current), output short-circuit protection (indefinite short tolerance), thermal overload protection (160°C shutdown with 15°C hysteresis), and input undervoltage lockout (2.1–2.4V). These features eliminate the need for external protection components in most battery-powered designs.