Analog Devices Inc./Maxim Integrated MAX8878EZK36+T

Overview

MAX8878EZK36+T from Maxim Integrated is a low-noise, low-dropout linear regulator with fixed 3.6V 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 - designed for battery-powered portable electronics requiring stable, clean voltage rails.

For engineers reviewing the MAX8878EZK36+T datasheet, MAX8878EZK36+T pinout, MAX8878EZK36+T application, or MAX8878EZK36+T equivalent, key selection criteria include its thin SOT23-5 package, auto-discharge shutdown function, ±1.4% output accuracy over temperature, and compatibility with industry-standard '2982 footprint.

Technical Context

The MAX8878EZK36+T uses an internal P-channel MOSFET pass transistor (1.1Ω typical R_DS(ON)) to achieve low dropout and eliminate base-drive current loss. 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 (limits reverse current to 1mA), thermal shutdown at +155°C with 15°C hysteresis, and a dedicated BP pin for 0.01µF capacitor-based noise filtering. The MAX8878 variant uniquely includes active output discharge via a 300Ω internal resistance during shutdown.

Key Specifications

Pinout & Package

MAX8878EZK36+T is housed in a 5-pin thin SOT23 package (JEDEC MO-178AA), optimized for space-constrained portable designs. The GND pin serves as both electrical return and thermal path - requires soldering to a large copper area for thermal management.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX8878EZK36+T, the MAX8877EZK36+T omits auto-discharge but matches all electrical and mechanical specs, while the MCP1703T-3602E/MB trades noise/dropout performance for broader availability and lower unit cost - making it viable only where MAX8878's precision discharge and ultra-low noise are noncritical.

Availability

MAX8878EZK36+T is available at Aetrix Electronics and suitable for cellular handsets, PCMCIA cards, palmtop computers, and electronic planners requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for MAX8878EZK36+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 demanding applications.

The MAX8877/MAX8878 family was engineered specifically for battery-powered portable electronics - prioritizing ultra-low noise, minimal dropout, and intelligent protection features in miniature SOT23 packages.

FAQ

What is the output voltage tolerance of the MAX8878EZK36+T over temperature and load?

The MAX8878EZK36+T delivers 3.6V with ±1.4% accuracy across -40°C to +85°C ambient temperature and 0.1mA to 120mA load current. This specification is guaranteed by production testing and statistical correlation - ensuring consistent regulation in portable devices exposed to wide thermal and dynamic load variations. The MAX8878EZK36+T maintains this tolerance without external trimming or feedback components.

Does the MAX8878EZK36+T require an external BP capacitor, and what happens if it's omitted?

Yes, the MAX8878EZK36+T requires a 0.01µF ceramic capacitor between BP and GND to achieve its specified 30µVRMS output noise. Omitting it increases output noise significantly - measurements show >100µVRMS without the BP cap - degrading performance in noise-sensitive analog circuits like RF front-ends or precision ADC references. The BP pin is not optional for low-noise operation of the MAX8878EZK36+T.

How does the auto-discharge function work in the MAX8878EZK36+T during shutdown?

When SHDN is pulled low, the MAX8878EZK36+T activates an internal 300Ω discharge path from OUT to GND, actively pulling the output voltage toward ground. This feature is unique to the MAX8878 series and absent in MAX8877 variants. It ensures rapid rail collapse - critical for hot-plug safety and power sequencing in modular systems - and is fully integrated, requiring no external FET or resistor network for the MAX8878EZK36+T.

Can the MAX8878EZK36+T operate with input voltages below 2.5V?

No, the MAX8878EZK36+T has a minimum input voltage rating of 2.5V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 2.5V risks improper regulation, increased dropout, or functional failure. For sub-2.5V inputs, alternative regulators such as the MAX1726 or TPS7A05 series must be considered - the MAX8878EZK36+T is not rated or characterized for that range.

What thermal considerations apply to the MAX8878EZK36+T in a thin SOT23-5 package?

The MAX8878EZK36+T in thin SOT23-5 has θ_JB = 110°C/W and a maximum continuous power dissipation of 727mW at +70°C ambient. To avoid thermal shutdown, PCB layout must maximize GND pad copper area for heat spreading. Derating begins above +70°C at 9.1mW/°C. At 150mA load with 3.6V output and 4.5V input, power dissipation is 135mW - well within limits if thermal design is implemented correctly for the MAX8878EZK36+T.