Analog Devices Inc./Maxim Integrated MAX8860EUA33+

Overview

MAX8860EUA33+ from Maxim Integrated is a fixed-output, low-noise, low-dropout linear regulator delivering 300mA at 3.3V with 60µVRMS output noise, 105mV dropout at 200mA, and 120µA no-load supply current. It features Dual Mode™ operation (preset or adjustable), reverse battery protection, thermal/short-circuit protection, and FAULT indicator output - deployed in wireless handsets and DSP core power rails.

For engineers reviewing the MAX8860EUA33+ datasheet, MAX8860EUA33+ pinout, MAX8860EUA33+ application, or MAX8860EUA33+ equivalent, key selection criteria include guaranteed 3.3V ±1.5% output accuracy over -40°C to +85°C, µMAX-8 package compatibility, 10nA shutdown current, and fault-detection threshold tracking dropout voltage across load conditions.

Technical Context

The MAX8860EUA33+ uses an internal P-channel MOSFET pass transistor (R_DS(ON) ≈ 0.5Ω) enabling low dropout and eliminating base-drive current loss. Its Dual Mode™ comparator selects feedback path based on SET pin voltage (<60mV for preset mode), ensuring stable 3.3V regulation when SET is grounded.

Integrated fault detection monitors input-to-output differential voltage (130mV threshold at 200mA) and asserts open-drain FAULT low during dropout, current limit, or thermal shutdown. Compensation is implemented via external 33nF capacitor on CC pin to stabilize error amplifier loop and suppress noise.

Key Specifications

Pinout & Package

The MAX8860EUA33+ is housed in an 8-pin µMAX package (3.0mm × 3.0mm × 1.1mm max height), thermally enhanced with exposed pad (not electrically connected), compatible with standard 0.050" pitch PCB assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS76333DBVR and MCP1700T-3302E/TT, the MAX8860EUA33+ uniquely combines 300mA output, 60µVRMS noise, FAULT reporting, and reverse battery protection in a single µMAX-8 package - making it optimal for handheld instrumentation and wireless infrastructure where reliability and signal integrity are co-prioritized.

Availability

MAX8860EUA33+ is available at Aetrix Electronics and suitable for wireless handsets, DSP core power supplies, and hand-held instruments requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for industrial and medical-grade designs.

Supply support for MAX8860EUA33+ 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX8860 series was designed specifically for battery-powered portable electronics requiring low-noise, low-quiescent-current regulation with robust fault handling - targeting wireless handsets, PDAs, and measurement instruments.

FAQ

What is the guaranteed output voltage tolerance for MAX8860EUA33+ over temperature?

The MAX8860EUA33+ guarantees 3.3V output with ±1.5% tolerance across the full operating temperature range of -40°C to +85°C, as confirmed in the Electrical Characteristics table under "Output Voltage" for MAX8860EUA33. This specification ensures reliable 3.3V rail generation for microcontrollers and interface ICs without additional post-regulation filtering.

Does MAX8860EUA33+ require an external capacitor on the CC pin, and why?

Yes, MAX8860EUA33+ requires a 33nF capacitor connected between CC pin and GND. This external capacitor stabilizes the error amplifier's integrator stage, minimizing load- and line-regulation errors while reducing output voltage noise - a mandatory design element per the Typical Operating Circuit and Integrator Circuitry section of the datasheet.

Can MAX8860EUA33+ be used in adjustable-output mode, and what changes are needed?

Yes, MAX8860EUA33+ supports adjustable mode by disconnecting SET from GND and connecting it to an external resistor divider. The output voltage then follows V_OUT = 1.25V × (1 + R1/R2). However, the device retains its 3.3V preset trim; using adjustable mode forfeits the factory-calibrated 3.3V accuracy and requires careful resistor selection to meet target voltage and load-current stability.

How does the FAULT pin behave during thermal shutdown in MAX8860EUA33+?

During thermal shutdown, the MAX8860EUA33+ asserts the FAULT pin low, as the fault-detection circuitry responds to loss of regulation caused by junction temperature exceeding +170°C. FAULT remains low until the die cools sufficiently (~20°C hysteresis) and regulation resumes - providing unambiguous hardware-level thermal fault indication without software polling.

What is the minimum output capacitor value required for stable operation of MAX8860EUA33+?

The minimum recommended output capacitor for stable operation of MAX8860EUA33+ is 2.2µF ceramic with ESR < 0.5Ω, as specified in the Applications Information section. Using less capacitance risks oscillation or excessive load-transient overshoot, especially at full 300mA load and across the -40°C to +85°C temperature range.