Analog Devices Inc./Maxim Integrated MAX8878EZK25+T

Overview

MAX8878EZK25+T from Maxim Integrated is a low-noise, low-dropout linear regulator with fixed 2.5V output, delivering up to 150mA from a 2.5V–6.5V input. It features 30µVRMS output noise, 165mV dropout at 150mA, and 100µA operating supply current independent of load or dropout condition. Designed for battery-powered portable electronics requiring stable, quiet voltage regulation.

For engineers reviewing the MAX8878EZK25+T datasheet, MAX8878EZK25+T pinout, MAX8878EZK25+T application, or MAX8878EZK25+T equivalent, key selection criteria include ultra-low quiescent current in dropout, auto-discharge functionality during shutdown, ±1.4% output voltage accuracy over temperature, and SOT23-5 thin-package thermal performance (θJB = 110°C/W).

Technical Context

The MAX8878EZK25+T uses an internal P-channel MOSFET pass transistor (RDS(ON) ≈ 1.1Ω), eliminating base-drive current and enabling constant 100µA IQ across all load and dropout conditions. Its error amplifier compares a 1.25V bandgap reference against feedback from an internal resistor divider tied to the OUT pin.

It integrates reverse-battery protection limiting reverse current to 1mA, thermal shutdown at +155°C with 15°C hysteresis, and-uniquely versus MAX8877-a dedicated auto-discharge path (300Ω resistance) that actively pulls OUT to GND during SHDN assertion. The BP pin enables noise reduction via a 0.01µF capacitor forming an 80Hz low-pass filter.

Key Specifications

Pinout & Package

MAX8878EZK25+T is housed in a 5-pin thin SOT23 package (JEDEC MO-178AA), optimized for thermal performance (θJB = 110°C/W) and board space in portable designs. The GND pin serves as both electrical return and primary thermal path; soldering to a large copper area is required for rated power dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX8878EZK25+T, MAX8877EZK25+T removes auto-discharge while retaining identical noise, accuracy, and thermal performance - making it a functional subset for simpler systems. The Torex XC6206P252MR-G offers basic regulation but sacrifices key protections and low-noise capability essential for portable instrumentation and communications devices.

Availability

MAX8878EZK25+T is available at Aetrix Electronics and suitable for cellular handsets, PCMCIA cards, hand-held instruments, and electronic planners requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for MAX8878EZK25+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, automotive, and portable applications.

The MAX8877/MAX8878 product line was designed specifically for battery-powered portable electronics demanding ultra-low quiescent current, low noise, and robust fault protection in minimal footprint packages.

FAQ

What is the output voltage tolerance of the MAX8878EZK25+T over temperature and load?

The MAX8878EZK25+T provides a factory-preset 2.5V output with ±1.4% accuracy over the full -40°C to +85°C operating range and 0.1mA–120mA load current. This specification is guaranteed by production testing and statistical correlation, ensuring consistent voltage delivery across battery discharge and environmental variation in handheld devices.

Does the MAX8878EZK25+T require external components for stable operation?

Yes - the MAX8878EZK25+T requires three external capacitors: a ≥1µF ceramic capacitor from IN to GND, a ≥1µF ceramic capacitor (ESR <0.2Ω) from OUT to GND, and a 0.01µF ceramic capacitor from BP to GND. These ensure stability, low noise, and proper transient response per the manufacturer's validated layout guidelines.

How does the auto-discharge function work in the MAX8878EZK25+T?

When the SHDN pin is pulled low, the MAX8878EZK25+T activates an internal 300Ω discharge path between OUT and GND. This actively pulls the output voltage to ground within microseconds, preventing residual charge from interfering with system reset sequencing or causing latch-up in downstream logic - a feature absent in the MAX8877 variant.

What thermal performance can be expected from the MAX8878EZK25+T in its thin SOT23 package?

The MAX8878EZK25+T in thin SOT23 has a junction-to-board thermal resistance (θJB) of 110°C/W. With proper PCB layout - including a large GND pad connected to internal ground planes - it sustains 150mA at VIN = 4.5V and TA = +70°C without exceeding the +150°C maximum junction temperature, enabling reliable operation in space-constrained portable assemblies.

Is the MAX8878EZK25+T pin-compatible with legacy '2982 regulators?

Yes - the MAX8878EZK25+T uses the industry-standard 5-pin '2982 pinout (IN, GND, SHDN, BP, OUT). This allows direct replacement of older regulators in existing designs, delivering improved dropout voltage (165mV vs. typical 300mV), lower noise (30µVRMS), and added features like auto-discharge and reverse-battery protection without PCB changes.