Analog Devices Inc./Maxim Integrated MAX8877EUK28+T

Overview

MAX8877EUK28+T from Maxim Integrated is a low-noise, low-dropout linear regulator with 2.8V preset output, 150mA max output current, 165mV dropout at full load, 30µVRMS output noise, and 100µA operating supply current. It uses an internal P-channel MOSFET pass transistor and operates from 2.5V to 6.5V input, serving as a stable voltage source in space-constrained battery-powered systems such as handheld instruments and PCMCIA cards.

For engineers reviewing the MAX8877EUK28+T datasheet, MAX8877EUK28+T pinout, MAX8877EUK28+T application, or MAX8877EUK28+T equivalent, key selection criteria include dropout performance at 150mA, shutdown current (10nA), output voltage accuracy (±1.4%), thermal protection (155°C trip), and BP-capacitor–dependent noise reduction.

Technical Context

The MAX8877EUK28+T implements a fixed-output LDO architecture with 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 seen in PNP-based regulators.

It integrates reverse-battery protection (limits reverse current to 1mA), thermal shutdown with 15°C hysteresis, short-circuit current limiting (160–390mA), and logic-controlled active-low shutdown. The BP pin accepts a 0.01µF ceramic capacitor to form an 80Hz low-pass filter that reduces reference noise, directly contributing to its 30µVRMS output noise specification.

Key Specifications

Pinout & Package

SOT23-5 regular package (JEDEC MO-178AA), 5-pin surface-mount, thermally enhanced GND pad for dissipation up to 571mW at +70°C ambient.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS76328DBVR and MCP1702T-2802E/MB, the MAX8877EUK28+T uniquely balances ultra-low noise (30µVRMS), low dropout (165mV), and robust protection (reverse-battery, thermal, short-circuit) in a standard SOT23-5 footprint-making it optimal for high-integrity portable instrumentation where signal integrity and fault resilience are non-negotiable.

Availability

MAX8877EUK28+T is available at Aetrix Electronics and suitable for hand-held instruments, PCMCIA cards, cordless telephones, and electronic planners requiring stable component supply, long-lifecycle support, and guaranteed parametric compliance across -40°C to +85°C.

Supply support for MAX8877EUK28+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) designs precision analog, mixed-signal, and power-management ICs for demanding industrial, medical, and portable applications.

The MAX8877 series targets battery-powered systems needing low-noise, low-quiescent-current regulation with robust fault protection-specifically addressing voltage rail integrity in handheld, telecom, and peripheral devices.

FAQ

What is the output voltage tolerance of the MAX8877EUK28+T over temperature and load?

The MAX8877EUK28+T guarantees ±1.4% output voltage accuracy across -40°C to +85°C ambient temperature and 0.1mA to 120mA load current, as specified in the Electrical Characteristics table. This tolerance holds for both 2.5V–5.0V and 1.5V–2.4V output variants, with tighter initial trim at +25°C. The MAX8877EUK28+T's 2.8V output remains within 2.76V–2.84V under all rated conditions, supporting tight analog supply margins.

Does the MAX8877EUK28+T include auto-discharge functionality during shutdown?

No, the MAX8877EUK28+T does not include auto-discharge. That feature is exclusive to the MAX8878 family (e.g., MAX8878EUK28+T). When the MAX8877EUK28+T enters shutdown (SHDN ≤ 0.4V), the output remains floating at its last regulated voltage; external circuitry is required to discharge the output capacitor if needed.

What capacitor values are required for stable operation of the MAX8877EUK28+T?

For stable operation, the MAX8877EUK28+T requires a 1µF ceramic input capacitor (CIN) and a 1µF ceramic output capacitor (COUT) with <0.2Ω ESR when VOUT ≥ 2.5V - which applies to the 2.8V MAX8877EUK28+T. A 0.01µF ceramic capacitor must be placed on the BP pin. X7R or X5R dielectrics are recommended; Z5U/Y5V types may require ≥2× capacitance for low-temperature stability.

How does the MAX8877EUK28+T achieve its low 30µVRMS output noise?

The MAX8877EUK28+T achieves 30µVRMS output noise (10Hz–100kHz) through a dedicated BP (bypass) pin that connects to an internal 200kΩ resistor, forming an 80Hz RC low-pass filter with an external 0.01µF ceramic capacitor. This filters bandgap reference noise before it reaches the error amplifier, directly reducing output spectral density - a design feature not present in standard LDOs without BP pins.

Is the MAX8877EUK28+T pin-compatible with the industry-standard '2982 regulator?

Yes, the MAX8877EUK28+T is explicitly designed as a pin-compatible upgrade to the industry-standard LM2982 family. It shares identical SOT23-5 pinout (IN, GND, SHDN, BP, OUT), allowing drop-in replacement without PCB modification. Key improvements include lower dropout (165mV vs. ~350mV), lower noise (30µVRMS vs. ~100µVRMS), and added reverse-battery protection.