Analog Devices Inc./Maxim Integrated MAX8869EUE33-T

Overview

MAX8869EUE33-T from Maxim Integrated is a 1A, low-dropout linear regulator with fixed +3.3V output, ±1% accuracy, 200mV dropout at full load, and MicroCap™ stability using only 1µF output capacitance. It integrates an internal PMOS pass transistor, soft-start, reset output, and thermal/short-circuit protection for use in telecom hardware, notebook computers, and mobile base stations.

For engineers reviewing the MAX8869EUE33-T datasheet, MAX8869EUE33-T pinout, MAX8869EUE33-T application, or MAX8869EUE33-T equivalent, key selection criteria include guaranteed 1A output under 2.7V–5.5V input, 54dB PSRR at 100kHz, adjustable soft-start timing, 3ms reset delay, and TSSOP-EP package thermal performance.

Technical Context

The MAX8869EUE33-T uses a P-channel MOSFET pass element with no gate drive current, enabling 500µA quiescent supply current even in dropout. Its Dual Mode architecture selects between factory-preset +3.3V regulation (SET = GND) and adjustable output via external resistor divider (SET > 80mV).

A dedicated 0.8V internal reference feeds an error amplifier that controls the PMOS driver; the RST open-drain output asserts low when VOUT falls 8% below nominal and remains active for ≥3ms after recovery. Thermal shutdown triggers at +170°C with ~20°C hysteresis.

Key Specifications

Pinout & Package

The MAX8869EUE33-T is housed in a 16-pin TSSOP-EP package with exposed thermal pad, rated for 1.5W dissipation at +70°C ambient and 19mW/°C derating above. The exposed pad and Pin 10 (GND) must be soldered to a large PCB ground plane for thermal management.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A4700RGWR and ADP1740ACPZ-3.3-R7, the MAX8869EUE33-T uniquely combines fixed +3.3V output, ±1% accuracy, integrated RST with 3ms delay, and 200mV dropout - making it optimal for space-constrained, thermally demanding telecom and computing applications requiring robust power sequencing.

Availability

MAX8869EUE33-T is available at Aetrix Electronics and suitable for telecom hardware, notebook computers, and mobile base station RF modules requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across -40°C to +85°C.

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) designs high-performance analog and mixed-signal ICs for power management, interface, sensing, and timing applications.

The MAX8869 product line delivers high-current, low-dropout linear regulators optimized for space-constrained, thermally challenging environments in networking, telecom, and portable computing equipment.

FAQ

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

The MAX8869EUE33-T has an absolute maximum input voltage of +6V referenced to GND. Its operational input range is +2.7V to +5.5V, and it includes undervoltage lockout that disables regulation below ~2.4V to prevent erratic behavior during brownout conditions. Exceeding +6V may cause permanent damage.

Does the MAX8869EUE33-T require external resistors to set its output voltage?

No - the MAX8869EUE33-T is factory-configured for fixed +3.3V output. Its SET pin must be connected to GND to activate preset mode; no external resistors are needed. If used in adjustable mode (SET > 80mV), external resistors are required, but that configuration does not apply to the MAX8869EUE33-T variant.

How does the RST output of the MAX8869EUE33-T behave during power-up and fault conditions?

The RST output of the MAX8869EUE33-T is an open-drain signal that stays low until VOUT reaches ≥92% of 3.3V and remains stable for ≥3ms. It asserts low again if VOUT drops below 92% of nominal, and stays low for ≥3ms after recovery. During shutdown (SHDN = GND), RST is actively pulled low.

Can the MAX8869EUE33-T operate with a 1µF ceramic output capacitor across the full temperature range?

Yes - the MAX8869EUE33-T is specifically designed for MicroCap™ stability with a minimum 1µF ceramic output capacitor (low-ESR, >5MHz SRF). This is guaranteed over the full -40°C to +85°C operating range and eliminates need for larger or higher-ESR alternatives.

What thermal management requirements apply to the MAX8869EUE33-T in a 1A application?

The MAX8869EUE33-T requires connection of its exposed thermal pad and Pin 10 (GND) to a large PCB ground plane (≥1 in² recommended). With proper layout, it sustains 1A at 3.3V output with up to 2.2V input-output differential at +70°C ambient. Derating is 19mW/°C above +70°C, and junction temperature must not exceed +150°C continuously.