Analog Devices Inc./Maxim Integrated MAX8877EUK29

Overview

MAX8877EUK29 from Maxim Integrated is a low-noise, low-dropout linear regulator with 2.84V preset output, 150mA maximum output current, 165mV dropout at full load, and 30µVRMS output noise. It uses an internal P-channel MOSFET pass transistor and operates from 2.5V to 6.5V input, targeting battery-powered portable electronics requiring stable, quiet voltage regulation.

For engineers reviewing the MAX8877EUK29 datasheet, MAX8877EUK29 pinout, MAX8877EUK29 application, or MAX8877EUK29 equivalent, key selection criteria include its 2.84V factory-trimmed output accuracy (±1.4%), 100µA operating supply current across load and dropout conditions, 10nA shutdown current, reverse battery protection, and SOT23-5 pin compatibility with industry-standard '2982 regulators.

Technical Context

The MAX8877EUK29 implements a fixed-output LDO architecture using a 1.25V bandgap reference, error amplifier, and internal feedback divider. Its P-channel MOSFET pass device delivers 1.1Ω typical R_DS(ON), enabling low dropout and eliminating base-drive current loss common in PNP-based regulators.

It integrates thermal shutdown (155°C trip, 15°C hysteresis), short-circuit current limiting (160–390mA), reverse battery protection (<1mA reverse current), and logic-controlled active-low shutdown. Unlike the MAX8878 variant, it lacks auto-discharge functionality.

Key Specifications

Pinout & Package

MAX8877EUK29 is housed in a 5-pin SOT23-5 regular package (JEDEC MO-178AA), with GND serving as both electrical reference and thermal path. The package is RoHS-compliant and rated for -40°C to +85°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX8877EUK29, MAX8877EUK30-T offers identical performance at 3.0V output, while TPS76328DBVR trades lower quiescent current for higher dropout and missing protection features - making MAX8877EUK29 optimal for battery-critical, noise-sensitive, and field-reliable designs.

Availability

MAX8877EUK29 is available at Aetrix Electronics and suitable for cellular telephones, PCMCIA cards, hand-held instruments, and electronic planners requiring stable component supply, long-term lifecycle support, and guaranteed parametric compliance.

Supply support for MAX8877EUK29 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 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 needing ultra-low-noise, low-dropout regulation with robust protection and minimal board space - targeting cellular handsets, modems, and handheld instrumentation.

FAQ

What is the output voltage tolerance of the MAX8877EUK29 over temperature and load?

The MAX8877EUK29 guarantees ±1.4% output voltage accuracy over load (0.1mA to 120mA) and temperature (-40°C to +85°C) for V_OUT ≥2.5V. At 2.84V output, this corresponds to ±39.8mV absolute tolerance. Typical variation across temperature is less than ±10mV at 50mA load, as shown in Figure MAX8877-07 of the datasheet.

Does the MAX8877EUK29 include auto-discharge functionality during shutdown?

No, the MAX8877EUK29 does not include auto-discharge. That feature is exclusive to the MAX8878 family. When the MAX8877EUK29 is placed in shutdown (SHDN pulled low), the output remains floating at its last regulated voltage until external circuitry discharges it. This behavior is confirmed in the Functional Diagram (Figure 1) and Pin Description section of the datasheet.

What is the recommended output capacitor for the MAX8877EUK29?

For the MAX8877EUK29's 2.84V output (≥2.5V), a minimum 1µF ceramic capacitor with ESR <0.2Ω is recommended on the OUT pin. X7R or X5R dielectrics are preferred for stable capacitance across temperature. Larger values (e.g., 3.3µF–10µF) improve load-transient response and PSRR but are not required for basic stability.

How does the MAX8877EUK29 achieve low dropout with a P-channel MOSFET?

The MAX8877EUK29 uses a 1.1Ω typical R_DS(ON) P-channel MOSFET pass transistor, eliminating base-drive current losses inherent in PNP designs. Dropout voltage is calculated as I_LOAD × R_DS(ON), yielding 165mV at 150mA. This architecture maintains 100µA quiescent current regardless of load or dropout state - a key advantage over bipolar-based LDOs.

Is reverse battery protection active on both IN and SHDN pins of the MAX8877EUK29?

Yes, reverse battery protection in the MAX8877EUK29 monitors both IN and SHDN pins. If either pin falls below GND, internal circuitry disconnects parasitic paths and limits reverse current to <1mA. This dual-pin monitoring prevents damage during incorrect battery insertion or accidental grounding of control lines - a feature explicitly documented in the Applications Information section.