Analog Devices Inc./Maxim Integrated MAX8878EUK36+T

Overview

MAX8878EUK36+T from Maxim Integrated is a low-noise, low-dropout linear regulator with 3.6V preset output, 150mA maximum output current, 165mV dropout at full load, 30µVRMS output noise, and 100µA operating supply current. It features an internal P-channel MOSFET pass transistor, reverse battery protection, thermal shutdown, and auto-discharge functionality-designed for space-constrained, battery-powered portable electronics.

For engineers reviewing the MAX8878EUK36+T datasheet, MAX8878EUK36+T pinout, MAX8878EUK36+T application, or MAX8878EUK36+T equivalent, key selection criteria include dropout performance at 150mA, shutdown leakage (10nA), output voltage accuracy (±1.4%), BP capacitor–dependent noise reduction, and SOT23-5 regular package compatibility with industry-standard '2982 footprints.

Technical Context

The MAX8878EUK36+T uses an internal 1.25V bandgap reference and error amplifier to regulate output via a 1.1Ω typical P-channel MOSFET pass transistor-eliminating base-drive current and enabling stable 100µA quiescent current across load and dropout conditions. Its BP pin connects to a 0.01µF ceramic capacitor forming an 80Hz low-pass filter that reduces reference noise, directly enabling the 30µVRMS output noise specification.

Unlike the MAX8877, the MAX8878EUK36+T integrates auto-discharge circuitry activated during logic-low SHDN: a 300Ω internal discharge path actively pulls OUT to GND, preventing residual voltage hold-up in power-managed systems. Thermal protection triggers at +155°C with 15°C hysteresis, and reverse battery protection limits reverse current to ≤1mA when IN or SHDN falls below GND.

Key Specifications

Pinout & Package

MAX8878EUK36+T is housed in a RoHS-compliant, lead-free 5-pin SOT23-5 regular package (JEDEC MO-178AA), with GND serving as both electrical return and thermal path. The package footprint matches industry-standard '2982 regulators, enabling drop-in replacement in existing designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX8877EUK36+T, the MAX8878EUK36+T adds essential auto-discharge for safe multi-rail power sequencing; versus XC6206P362MR-G, it trades higher current for guaranteed pin compatibility, integrated reverse-battery protection, and lower noise-making it optimal for legacy '2982-replacement and battery-sensitive designs.

Availability

MAX8878EUK36+T is available at Aetrix Electronics and suitable for cellular handsets, PCMCIA cards, palmtop computers, and electronic planners requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for MAX8878EUK36+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 consumer applications.

The MAX8877/MAX8878 product line was designed specifically for battery-powered portable electronics requiring ultra-low quiescent current, low noise, and compact packaging-targeting cellular telephones, handheld instruments, and PCMCIA peripherals.

FAQ

What is the output voltage tolerance of the MAX8878EUK36+T over temperature and load?

The MAX8878EUK36+T delivers 3.6V output with ±1.4% accuracy across the full -40°C to +85°C operating temperature range and for load currents from 0.1mA to 120mA. At +25°C and 0.1mA load, the tolerance tightens to ±1.4% (±50.4mV). This specification ensures reliable operation for precision analog circuits without external trimming.

Does the MAX8878EUK36+T require external components for stable operation?

Yes-the MAX8878EUK36+T requires three external capacitors: a ≥1µF ceramic capacitor on IN to GND, a ≥1µF (ESR <0.2Ω) ceramic capacitor on OUT to GND, and a 0.01µF ceramic capacitor on BP to GND. These are mandatory for stability, noise reduction, and transient response; omitting the BP capacitor increases output noise to >100µVRMS.

How does the auto-discharge feature of the MAX8878EUK36+T operate?

When the SHDN pin is driven logic-low, the MAX8878EUK36+T activates an internal 300Ω discharge path between OUT and GND. This actively pulls the output voltage to ground within microseconds-preventing back-powering of upstream circuitry or unintended wake-up in multi-rail systems. The MAX8877EUK36+T lacks this function.

Can the MAX8878EUK36+T be used with input voltages below 2.5V?

No-the MAX8878EUK36+T has a minimum input voltage rating of 2.5V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 2.5V is not characterized or guaranteed; attempting to power the device at 2.4V or lower may result in unregulated output, increased dropout, or functional failure.

What thermal protection behavior does the MAX8878EUK36+T exhibit under overload?

The MAX8878EUK36+T incorporates thermal shutdown that activates at +155°C junction temperature, disabling the pass transistor until the die cools by 15°C (to +140°C), then automatically re-enabling. This hysteresis prevents destructive thermal cycling. Continuous operation above +150°C junction temperature violates the absolute maximum rating and risks permanent damage.