Analog Devices Inc./Maxim Integrated MAX8860EUA25+

Overview

The MAX8860EUA25+ from Maxim Integrated is a low-noise, low-dropout linear regulator delivering 300mA at a fixed 2.5V output, operating from 2.5V to 6.5V input, with 60µVRMS output noise, 105mV dropout at 200mA, and 120µA no-load supply current. It serves as a core power supply for DSP cores and handheld instrumentation where stable, quiet voltage regulation is critical.

For engineers reviewing the MAX8860EUA25+ datasheet, MAX8860EUA25+ pinout, MAX8860EUA25+ application, or MAX8860EUA25+ equivalent, key selection criteria include its Dual Mode™ configurability (fixed or adjustable), FAULT indicator functionality, reverse battery protection, µMAX package footprint, and thermal shutdown behavior under sustained load.

Technical Context

The MAX8860EUA25+ 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 an external SET-resistor divider.

Dual Mode™ operation is controlled by the SET pin voltage: grounding SET selects the factory-trimmed 2.5V output; pulling SET above 60mV enables adjustable mode (1.25V–6.5V). Fault detection monitors both regulation loss and insufficient input-output differential (e.g., <130mV at 200mA), driving the open-drain FAULT pin low.

Key Specifications

Pinout & Package

The MAX8860EUA25+ is housed in an 8-pin µMAX package (3mm × 3mm, 1.1mm max height), thermally enhanced with exposed paddle (not electrically connected in standard version).

Key Features

Applications

Equivalent & Alternatives

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

Compared with the TPS76325DBVR and MCP1700T-2502E/TT, the MAX8860EUA25+ delivers superior battery efficiency via lower dropout, integrated fault reporting for system diagnostics, and robust reverse-polarity resilience-critical for field-deployed handheld instruments and consumer devices.

Availability

MAX8860EUA25+ is available at Aetrix Electronics and suitable for wireless handsets, DSP core power supplies, and hand-held instrumentation requiring stable component supply, long-term lifecycle assurance, and guaranteed traceable sourcing.

Supply support for MAX8860EUA25+ 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 engineered specifically for battery-powered portable electronics requiring ultra-low quiescent current, low-noise regulation, and comprehensive fault protection in minimal PCB area.

FAQ

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

The MAX8860EUA25+ guarantees a 2.5V output with ±3% tolerance over the full –40°C to +85°C operating temperature range, as confirmed in the Electrical Characteristics table (2.43V min / 2.57V max at TA = –40°C to +85°C). This tight tolerance ensures reliable operation of 2.5V logic interfaces without external trimming. The MAX8860EUA25+ achieves this via factory-trimmed internal feedback resistors calibrated during production test.

Does MAX8860EUA25+ require an external compensation capacitor?

Yes, the MAX8860EUA25+ requires a 33nF capacitor connected between the CC pin and GND for loop stability, noise reduction, and optimal load- and line-regulation performance. Omitting this capacitor risks oscillation or degraded transient response. The MAX8860EUA25+ datasheet specifies this value as mandatory for all operating conditions, and the typical application circuit shows it as non-optional.

How does the FAULT pin behave during thermal shutdown?

During thermal shutdown, the MAX8860EUA25+ asserts the FAULT pin low to indicate loss of regulation - identical to its behavior during dropout or current-limit conditions. The FAULT pin remains low while the junction temperature exceeds +170°C and returns high-impedance only after the die cools sufficiently (~20°C hysteresis) and regulation resumes. This consistent signaling allows unified fault-handling firmware for MAX8860EUA25+ across all failure modes.

Can MAX8860EUA25+ operate with input voltages above 5.5V?

Yes, the MAX8860EUA25+ supports input voltages up to +6.5V per Absolute Maximum Ratings, but when VIN > +5.5V in fixed-output mode, a minimum load current of 50µA is required to maintain regulation. This requirement stems from internal biasing constraints and is explicitly stated in the Applications Information section. The MAX8860EUA25+ remains fully functional above 5.5V as long as this light load is present.

Is reverse battery protection active on both IN and SHDN pins?

Yes, reverse battery protection in the MAX8860EUA25+ actively monitors polarity on both IN and SHDN pins. If either pin falls below GND, internal circuitry disconnects parasitic paths and limits reverse current to less than 1mA - preventing overheating and damage from incorrectly installed batteries. This dual-pin protection is a documented feature in the Detailed Description section and distinguishes the MAX8860EUA25+ from many competing LDOs.