Analog Devices Inc./Maxim Integrated MAX8869EUE33+

Overview

MAX8869EUE33+ 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 an internal PMOS pass transistor, 500µA quiescent current, and integrated reset output (RST) for power-on sequencing in telecom and notebook power rails.

For engineers reviewing the MAX8869EUE33+ datasheet, MAX8869EUE33+ pinout, MAX8869EUE33+ application, or MAX8869EUE33+ equivalent, key selection criteria include guaranteed 1A output under 2.7V–5.5V input, thermal shutdown at +170°C, adjustable soft-start via external capacitor, 3ms RST release delay, and compatibility with low-ESR ceramic capacitors for stable operation in space-constrained PCB layouts.

Technical Context

The MAX8869EUE33+ implements Dual Mode regulation: SET pin grounded selects factory-preset +3.3V output, while external resistor-divider enables adjustable mode (0.8V–5.0V). Its 0.8V internal reference feeds an error amplifier driving a P-channel MOSFET pass device - eliminating base-drive current and enabling low 500µA quiescent supply current even in dropout.

It integrates multiple protection functions: foldback current limiting (1.7A short-circuit, 4A in-regulation), open-drain RST with 8% VOUT undervoltage detection and 3ms release delay, thermal shutdown at +170°C with ~20°C hysteresis, and input undervoltage lockout (2.35V–2.55V threshold). The 16-pin TSSOP-EP package uses exposed pad and GND pins for enhanced thermal dissipation.

Key Specifications

Pinout & Package

MAX8869EUE33+ is housed in a 16-pin TSSOP-EP (Exposed Pad) package rated for 1.5W continuous power dissipation at +70°C ambient. The exposed thermal pad must be soldered to a large PCB ground plane (≥1 in² recommended) to achieve thermal resistance sufficient for 1A operation.

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+ uniquely balances low dropout (200mV), integrated RST, soft-start programmability, and compact thermal packaging - making it optimal for space-constrained, fault-aware telecom and computing systems requiring guaranteed 1A at minimal input overhead.

Availability

MAX8869EUE33+ is available at Aetrix Electronics and suitable for telecom hardware, network equipment, and notebook computer designs requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.

Supply support for MAX8869EUE33+ 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 demanding industrial, communications, and computing applications.

The MAX8869 product line delivers microcap-stable, high-current LDOs optimized for space-constrained, thermally aggressive environments such as telecom infrastructure and portable computing - emphasizing low dropout, low IQ, and integrated fault management.

FAQ

What is the maximum continuous output current of the MAX8869EUE33+?

The MAX8869EUE33+ delivers a guaranteed 1A continuous output current across the full -40°C to +85°C operating temperature range. This rating assumes proper thermal management - specifically, soldering the exposed pad to a ≥1 in² PCB ground plane and maintaining ambient temperature ≤+70°C. At higher temperatures or with inadequate copper, derating applies per the 26.1mW/°C thermal derating curve specified in the Absolute Maximum Ratings table.

Does the MAX8869EUE33+ require an external resistor divider to set the output voltage?

No - the MAX8869EUE33+ is factory-configured for +3.3V fixed output. To enable this mode, the SET pin must be connected directly to GND with an impedance <10kΩ. An external resistor divider is only required if using the device in adjustable mode (0.8V–5.0V), which is not applicable to the MAX8869EUE33+ variant. Using a divider on this part risks unstable regulation or incorrect output voltage.

How does the RST output function on the MAX8869EUE33+?

The RST pin on the MAX8869EUE33+ is an open-drain output that goes low when the regulated +3.3V output falls more than 8% below nominal (i.e., below ~3.04V). It remains low for at least 3ms after VOUT recovers to within regulation. To use RST as a logic-level reset signal, connect a 100kΩ pull-up resistor from RST to the +3.3V output rail. During shutdown (SHDN = GND), RST is actively held low.

What capacitor values are required for stable operation of the MAX8869EUE33+?

The MAX8869EUE33+ requires ≥1µF ceramic capacitors at both input (IN–GND) and output (OUT–GND), with low ESR (≤60mΩ) and high self-resonant frequency (>5MHz). X5R or X7R dielectrics are recommended. These capacitors must be placed within 6mm of the IC pins, with wide (≥2.5mm) traces and direct connection to the exposed thermal pad/GND plane to ensure stability, low noise, and fast transient response - especially critical for high-current digital loads.

Can the MAX8869EUE33+ be used in automotive applications?

The MAX8869EUE33+ is rated for the industrial temperature range (-40°C to +85°C) and is not qualified to AEC-Q100 automotive standards. For automotive use, Maxim offers the MAX8869EUE33/V+ variant (noted in the Ordering Information table), which undergoes additional qualification testing and screening. Using the standard MAX8869EUE33+ in automotive environments may compromise reliability due to unvalidated stress performance under extended temperature cycling and vibration conditions.