Analog Devices Inc./Maxim Integrated MAX8880EUT+T

Overview

MAX8880EUT+T from Maxim Integrated is an ultra-low-quiescent-current (3.5µA), adjustable-output (1.25V–5.5V), 200mA low-dropout linear regulator in a 6-pin SOT23 package, featuring reverse battery protection, thermal shutdown, and open-drain POK output for out-of-regulation detection - designed for long-life battery-powered smoke detectors and smart battery packs.

For engineers reviewing the MAX8880EUT+T datasheet, MAX8880EUT+T pinout, MAX8880EUT+T application, or MAX8880EUT+T equivalent, key selection criteria include its 2Ω PMOS pass device enabling ultra-low IQ across dropout, ±1.5% output accuracy over temperature, and validated stability with 4.7µF/0.5Ω ESR output capacitors in space-constrained portable systems.

Technical Context

The MAX8880EUT+T implements a precision 1.25V internal reference feeding an error amplifier that controls a 2Ω PMOS pass transistor via a MOSFET driver. Its feedback architecture requires external resistors on the FB pin to set output voltage between 1.25V and 5.5V, with V_FB = 1.257V (±1.5%) at +25°C and ±2% over –40°C to +85°C.

Reverse battery protection limits IN-to-GND reverse current to <1mA when VIN < 0V; POK asserts low when V_OUT drops >10% below regulation; shutdown logic disables regulation when SHDN < 0.5V, reducing supply current to 1.5µA. Thermal shutdown activates at +160°C with 15°C hysteresis.

Key Specifications

Pinout & Package

MAX8880EUT+T is housed in a 6-pin SOT23-6 package (JEDEC MO-178AA, 2.9mm × 2.8mm × 1.3mm) with exposed pad not present - standard surface-mount footprint compatible with automated assembly and reflow.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-IQ LDO regulator applications.

Compared with TPS78225DRVR and MCP1703T-3302E/MB, the MAX8880EUT+T uniquely combines adjustable output, integrated POK, reverse battery protection, and ultra-low 3.5µA IQ in a legacy-compatible SOT23-6 footprint - making it optimal for upgrade paths in existing battery-powered safety and timing systems.

Availability

MAX8880EUT+T is available at Aetrix Electronics and suitable for smoke detectors, battery-powered alarms, and smart battery packs requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for MAX8880EUT+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and consumer applications.

The MAX8880/MAX8881 product line was engineered specifically for ultra-low-power, reverse-battery-protected regulation in safety-critical portable electronics - emphasizing longevity, fault resilience, and minimal board area.

FAQ

What is the maximum input voltage rating for the MAX8880EUT+T?

The MAX8880EUT+T has an absolute maximum input voltage of +14V relative to GND, but its specified operating input range is 2.5V to 12V. Operation above 12V is not guaranteed for performance or reliability, and sustained exposure near 14V may accelerate parametric drift or reduce lifetime. For robust design, maintain VIN ≤12V with appropriate transient suppression if used in noisy environments.

Can the MAX8880EUT+T be used with a 1µF output capacitor?

Yes, the MAX8880EUT+T is stable with a 1µF output capacitor for load currents up to 40mA, as confirmed in the datasheet's Applications Information section. For full 200mA capability, a 4.7µF capacitor with ≤0.5Ω ESR is required. Using 1µF at higher loads risks instability, poor transient response, and potential POK false triggers due to excessive output droop.

How does the POK output function on the MAX8880EUT+T?

The POK output on the MAX8880EUT+T is an open-drain signal that pulls low when the regulated output falls more than 10% below its nominal value or when the device is in shutdown. During normal regulation, POK is high-impedance. An external pull-up resistor (typically 10kΩ to V_OUT) is required. Adding a capacitor in parallel creates a programmable delay for reset assertion, useful for sequencing or debouncing.

Is the MAX8880EUT+T pin-compatible with the MAX8881 series?

No, the MAX8880EUT+T and MAX8881 variants share identical pinouts (SOT23-6 and TDFN) and mechanical footprints, but their FB pin functionality differs fundamentally: MAX8880EUT+T requires external resistors on FB for adjustment, while MAX8881 variants internally connect FB to OUT. Swapping them without circuit modification will result in incorrect or unregulated output voltage.

What thermal protection behavior does the MAX8880EUT+T exhibit under overload?

Under continuous thermal overload, the MAX8880EUT+T activates thermal shutdown at +160°C junction temperature, turning off the pass transistor. After cooling by 15°C (to ~145°C), it automatically resumes regulation. This results in pulsed output during sustained overload - a fail-safe mechanism that prevents permanent damage but requires thermal design (PCB copper area, airflow) to avoid entering this mode during normal operation.