Analog Devices Inc./Maxim Integrated MAX8869EUE50+

Overview

MAX8869EUE50+ from Maxim Integrated is a fixed +5.0V, 1A low-dropout linear regulator with ±1% output voltage accuracy, 200mV dropout at full load, and Microcap® technology enabling stable operation with only a 1µF output capacitor. It features integrated soft-start, open-drain reset output with 3ms delay, thermal shutdown, and foldback current limiting-designed for telecom hardware, notebook computers, and mobile base station power rails.

For engineers reviewing the MAX8869EUE50+ datasheet, MAX8869EUE50+ pinout, MAX8869EUE50+ application, or MAX8869EUE50+ equivalent, key selection considerations include guaranteed 1A output under 2.7V–5.5V input, 54dB PSRR at 100kHz, 500µA quiescent current, RST trip level at 92% nominal VOUT, and TSSOP-EP package thermal performance with exposed pad.

Technical Context

The MAX8869EUE50+ employs an internal P-channel MOSFET pass transistor with 0.2Ω typical R_DS(ON), eliminating base-drive current and enabling low 500µA supply current even in dropout. Its Dual Mode architecture uses a factory-trimmed internal resistor divider to fix V_OUT at +5.0V when SET is grounded.

Regulation relies on a precision 0.8V reference and error amplifier comparing feedback against that reference. The RST comparator monitors V_OUT continuously, asserting low when output falls 8% below nominal and holding for ≥3ms after recovery-providing deterministic power-on-reset timing for microcontrollers.

Key Specifications

Pinout & Package

The MAX8869EUE50+ is housed in a 16-pin TSSOP-EP package (3.1mm × 5.0mm × 1.1mm) with exposed thermal pad (EP) soldered to PCB ground plane for enhanced thermal dissipation (θ_JA reduced by ~30%). Package rated for 1.5W continuous power dissipation at +70°C ambient.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A4700RGWR and MCP1826T-5002E/OT, the MAX8869EUE50+ uniquely balances tight ±1% accuracy, integrated RST/soft-start/foldback, and 1µF-stable operation in a thermally optimized TSSOP-EP-making it optimal for space-constrained, high-reliability telecom and computing systems requiring full-feature LDO supervision.

Availability

MAX8869EUE50+ is available at Aetrix Electronics and suitable for telecom hardware, notebook computers, and mobile base station power management requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.

Supply support for MAX8869EUE50+ 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 computing markets.

The MAX8869 product line delivers microcap-stable, high-current LDOs with integrated supervision features-designed specifically for next-generation telecom infrastructure and portable computing platforms demanding compact size, low noise, and robust fault protection.

FAQ

What is the maximum continuous output current of the MAX8869EUE50+?

The MAX8869EUE50+ delivers a guaranteed 1A continuous output current across the full -40°C to +85°C operating temperature range. This rating assumes proper thermal management via the exposed pad and adequate PCB copper area. At ambient temperatures above +70°C, derating applies per the 26.1mW/°C thermal coefficient specified in the Absolute Maximum Ratings table.

Does the MAX8869EUE50+ require external components for basic operation?

Yes-the MAX8869EUE50+ requires at minimum a 1µF ceramic input capacitor (C_IN) between IN and GND, and a 1µF ceramic output capacitor (C_OUT) between OUT and GND. A 100kΩ pull-up resistor from RST to OUT is also required for functional reset signaling. No external resistors are needed for the +5.0V fixed output, as the internal divider is factory-trimmed.

How does the RST output function on the MAX8869EUE50+?

The RST output on the MAX8869EUE50+ is an open-drain signal that goes low when V_OUT drops below 92% of its nominal +5.0V value (i.e., <4.6V). It remains asserted for at least 3ms after V_OUT recovers to regulation. This provides a precise, temperature-stable power-on-reset pulse for microcontrollers without requiring external timing components.

Can the MAX8869EUE50+ be used in adjustable-output configurations?

No-the MAX8869EUE50+ is factory-configured for +5.0V fixed output only. While the underlying MAX8869 family supports adjustable mode via the SET pin, the EUE50+ variant has internal feedback resistors permanently configured for 5.0V. Using it in adjustable mode would violate the device's specified operation and void accuracy guarantees.

What thermal management practices are recommended for the MAX8869EUE50+?

For reliable 1A operation, solder the exposed thermal pad (EP) directly to a large PCB ground plane (≥1 in² recommended) using multiple thermal vias. Connect pin 10 (GND) to the same plane. Maintain ≥2.5mm-wide copper traces for IN and OUT nets, and place C_IN/C_OUT within 6mm of the IC. These practices reduce θ_JA and prevent junction temperature from exceeding +150°C under worst-case load conditions.