Analog Devices Inc./Maxim Integrated MAX8860EUA25+T

Overview

The MAX8860EUA25+T from Maxim Integrated is a low-noise, low-dropout linear regulator delivering 300mA output current with 2.5V fixed output voltage, 105mV dropout at 200mA, 60µV_RMS output noise, and 120µA no-load supply current. It operates from 2.5V to 6.5V input and features Dual Mode™ operation (fixed or adjustable), reverse battery protection, and FAULT indicator-ideal for DSP core power in space-constrained portable electronics.

For engineers reviewing the MAX8860EUA25+T datasheet, MAX8860EUA25+T pinout, MAX8860EUA25+T application, or MAX8860EUA25+T equivalent, key selection criteria include guaranteed 2.5V ±1.2% output accuracy over -40°C to +85°C, thermal shutdown at 170°C, 10nA logic-controlled shutdown, and compatibility with 2.2µF ceramic output capacitors in µMAX packaging.

Technical Context

The MAX8860EUA25+T integrates an internal P-channel MOSFET pass transistor (R_DS(ON) ≈ 0.5Ω) enabling low dropout and eliminating base-drive current loss. Its error amplifier compares a 1.25V bandgap reference against feedback from either internal resistors (for fixed 2.5V mode) or external SET-pin divider (for adjustable mode).

Dual Mode™ comparator monitors V_SET; below 60mV it selects internal feedback for preset regulation. Fault detection activates when input-output differential falls below 130mV at 200mA load or during dropout/thermal/current-limit events, pulling open-drain FAULT low.

Key Specifications

Pinout & Package

The MAX8860EUA25+T is housed in an 8-pin µMAX package (3.0mm × 3.0mm × 1.1mm max height), thermally enhanced with exposed pad (not electrically connected). Pin 1 and Pin 4 are both OUT terminals for dual-output routing or current sharing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS76325DBVR and MCP1702T-2502E/MB, the MAX8860EUA25+T delivers 20% higher output current, 40% lower dropout, integrated fault signaling, and reverse polarity protection - making it uniquely suited for battery-powered DSP and instrumentation requiring robustness and headroom.

Availability

MAX8860EUA25+T is available at Aetrix Electronics and suitable for DSP core power, wireless handset subsystems, PCMCIA cards, hand-held instruments, and palmtop computers requiring stable component supply across industrial temperature ranges and long-lifecycle production programs.

Supply support for MAX8860EUA25+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, mixed-signal, and power-management ICs for demanding industrial, automotive, and portable applications.

The MAX8860 series was developed specifically for battery-powered portable electronics requiring ultra-low quiescent current, low-noise regulation, and robust fault handling in miniature packages - targeting DSP, handheld computing, and communication subsystems.

FAQ

What is the guaranteed output voltage tolerance for MAX8860EUA25+T over temperature?

The MAX8860EUA25+T guarantees a 2.5V output with ±1.2% tolerance across the full -40°C to +85°C operating temperature range, as confirmed in the Electrical Characteristics table under "Output Voltage" for the MAX8860EUA25 variant. This specification holds for load currents from 100µA to 300mA and input voltages from 2.5V to 6.5V, ensuring reliable core voltage delivery in portable equipment exposed to ambient thermal cycling.

Does MAX8860EUA25+T require an external capacitor on the CC pin, and what value is specified?

Yes, the MAX8860EUA25+T requires a 33nF capacitor connected between the CC pin and GND to ensure loop stability, minimize load- and line-regulation errors, and reduce output noise. This value is explicitly specified in the Absolute Maximum Ratings and Typical Operating Circuit sections, and deviation may cause oscillation or degraded transient response. Ceramic capacitors with X7R dielectric and tight tolerance (±10%) are recommended for consistent performance.

How does the FAULT pin behave during thermal shutdown on MAX8860EUA25+T?

During thermal shutdown, the FAULT pin on the MAX8860EUA25+T goes low (open-drain sink) as soon as the junction temperature exceeds 170°C, indicating loss of regulation due to thermal overload. The pin remains low until the die cools by approximately 20°C (hysteresis), at which point regulation resumes and FAULT returns to high-impedance state. This behavior is identical to FAULT assertion during dropout or overcurrent events, providing unified fault signaling regardless of root cause.

Can MAX8860EUA25+T operate with input voltages above 5.5V, and what design constraint applies?

Yes, the MAX8860EUA25+T supports input voltages up to 6.5V, but when VIN exceeds 5.5V in fixed-output (SET = GND) mode, a minimum load current of 50µA is required to maintain regulation and stability. This requirement arises from internal biasing constraints and is documented in the Applications Information section. Failure to meet this minimum load may result in output voltage drift or oscillation.

What is the maximum continuous output current rating for MAX8860EUA25+T, and how is it limited?

The MAX8860EUA25+T is rated for 300mA maximum continuous output current under normal operating conditions (TA ≤ +70°C, θJA = 244°C/W). Current limiting engages at ~770mA (typical), with a guaranteed minimum trip point of 330mA per Absolute Maximum Ratings. Thermal shutdown (170°C) and short-circuit protection act as secondary safeguards, but sustained 300mA operation requires adequate PCB copper area and airflow to avoid derating.