Analog Devices Inc./Maxim Integrated MAX8869EUE33+T

Overview

MAX8869EUE33+T from Maxim Integrated is a fixed-output +3.3V, 1A low-dropout linear regulator with ±1% output voltage accuracy, 200mV dropout at full load, and Microcap® stability using only a 1µF output capacitor. It features integrated soft-start, open-drain reset (RST) with 3ms release delay, and thermal shutdown protection - deployed in telecom hardware, notebook computers, and mobile base station power rails.

For engineers reviewing the MAX8869EUE33+T datasheet, MAX8869EUE33+T pinout, MAX8869EUE33+T application, or MAX8869EUE33+T equivalent, key selection criteria include guaranteed 1A continuous output under 2.7V–5.5V input, 54dB PSRR at 100kHz, 500µA quiescent current, and TSSOP-EP package thermal performance for high-density PCBs.

Technical Context

The MAX8869EUE33+T uses an internal P-channel MOSFET pass transistor enabling low dropout and minimal quiescent current (500µA), unlike bipolar-based LDOs that suffer higher base-drive losses. Its Dual Mode architecture selects between factory-preset +3.3V output (via SET = GND) and adjustable mode (via external resistor divider), with a precise 800mV internal reference and error amplifier feedback loop.

Reset functionality is implemented via a dedicated low-VOUT comparator monitoring output deviation; RST asserts low when VOUT falls below 92% of nominal and remains asserted for ≥3ms after recovery. Thermal protection activates at +170°C junction temperature with ~20°C hysteresis, ensuring safe operation during overload or poor heatsinking.

Key Specifications

Pinout & Package

MAX8869EUE33+T is housed in a 16-pin TSSOP-EP (exposed pad) package rated for 1.5W dissipation and 1.1mm height - 30% smaller than SOT223. The exposed pad must be soldered to a large ground plane for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A4700RGWR and MCP1826T-3302E/DB, the MAX8869EUE33+T uniquely combines factory-preset +3.3V operation, 1µF stability, and 200mV dropout in a thermally enhanced TSSOP-EP - making it optimal for space- and efficiency-critical embedded systems where design-in simplicity and thermal density matter most.

Availability

MAX8869EUE33+T 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 MAX8869EUE33+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 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 optimized for space-constrained, thermally demanding applications - targeting next-generation networking infrastructure and portable electronics where efficiency, size, and reliability are non-negotiable.

FAQ

What is the maximum input voltage rating for the MAX8869EUE33+T?

The MAX8869EUE33+T has an absolute maximum input voltage of +6V applied to IN pins relative to GND. Its operational input range is +2.7V to +5.5V - meaning the device functions correctly and meets all specifications only within this window. Exceeding +5.5V may cause permanent damage or violate safety margins defined in the Absolute Maximum Ratings table.

Does the MAX8869EUE33+T require external resistors to set its +3.3V output?

No. The MAX8869EUE33+T is a factory-preset variant: its +3.3V output is internally configured and requires no external resistors. This is achieved by connecting the SET pin directly to GND, which engages the internal feedback divider. External resistors are only needed if using the adjustable version (e.g., MAX8869EUE/V+), not the MAX8869EUE33+T.

How does the RST pin function on the MAX8869EUE33+T?

The RST pin on the MAX8869EUE33+T is an open-drain output that goes low when the +3.3V output drops below 92% of nominal (i.e., <3.04V). It remains low for at least 3ms after VOUT recovers to regulation. A 100kΩ pull-up resistor to OUT is required to generate a valid logic-high signal. RST is also forced low during shutdown.

Can the MAX8869EUE33+T operate with a 1µF ceramic output capacitor?

Yes - the MAX8869EUE33+T is specifically designed for Microcap® stability and guarantees full performance (including transient response and PSRR) with only a 1µF low-ESR ceramic capacitor on the OUT pins. This eliminates the need for larger, bulkier capacitors typically required by conventional LDOs, reducing board area and cost.

What thermal considerations apply to the MAX8869EUE33+T in a 16-pin TSSOP-EP package?

The MAX8869EUE33+T's TSSOP-EP package relies on soldering the exposed pad (EP) and GND pin (10) to a large PCB ground plane (≥1 in² recommended) for effective heat dissipation. Without proper thermal coupling, junction temperature can exceed +150°C under 1A load with >1V dropout - triggering thermal shutdown at +170°C. Thermal resistance is minimized only when EP is fully connected to copper.