Analog Devices Inc./Maxim Integrated MAX8877EZK29+T

Overview

MAX8877EZK29+T 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, 30µVRMS output noise, and 100µA operating supply current. It uses an internal P-channel MOSFET pass device and operates from 2.5V to 6.5V input, serving as a precision voltage source in battery-powered portable electronics.

For engineers reviewing the MAX8877EZK29+T datasheet, MAX8877EZK29+T pinout, MAX8877EZK29+T application, or MAX8877EZK29+T equivalent, key selection criteria include dropout performance at 150mA, ±1.4% output voltage accuracy over temperature, shutdown leakage of 10nA, reverse battery protection, and SOT23-5 thin-package thermal performance (θJB = 110°C/W).

Technical Context

The MAX8877EZK29+T implements a 1.25V bandgap reference, error amplifier, and internal resistor divider to regulate a factory-preset 2.84V output. Its P-channel MOSFET pass transistor eliminates base-drive current, enabling stable 100µA quiescent current across load and dropout conditions.

It integrates thermal shutdown (155°C trip, 15°C hysteresis), short-circuit protection, and reverse battery protection that limits reverse current to 1mA. Unlike the MAX8878 variant, it lacks auto-discharge functionality - shutdown places the output in high-impedance state without active discharge.

Key Specifications

Pinout & Package

MAX8877EZK29+T is housed in a 5-pin thin SOT23 package (JEDEC MO-178AA), optimized for low thermal resistance (θJB = 110°C/W) and space-constrained PCB layouts. The GND pin serves as both electrical return and primary thermal path - requires soldering to a large copper area for reliable 150mA operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX8877EZK29+T, the MAX8877EUK29-T trades thermal efficiency for broader package availability, while the TPS76328DBVR offers TI's support ecosystem but sacrifices 15mV dropout margin and reverse polarity robustness - making MAX8877EZK29+T optimal for space- and battery-life-critical 2.84V applications.

Availability

MAX8877EZK29+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 manufacturability and consistent parametric performance.

Supply support for MAX8877EZK29+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 robust protection - targeting applications where every microwatt and millivolt impacts runtime and reliability.

FAQ

What is the exact output voltage of MAX8877EZK29+T and how is it set?

The MAX8877EZK29+T delivers a factory-preset output voltage of 2.84V with ±1.4% accuracy over –40°C to +85°C. This value is fixed by internal resistor divider ratios and cannot be adjusted externally. The "29" in the part number corresponds to the 2.84V option per Maxim's Expanded Ordering Information table, distinct from standard 2.8V or 2.9V variants.

Does MAX8877EZK29+T include auto-discharge functionality during shutdown?

No, MAX8877EZK29+T does not include auto-discharge. That feature is exclusive to the MAX8878 variant. When MAX8877EZK29+T enters shutdown (SHDN pin pulled low), the output goes into high-impedance state but remains floating at its pre-shutdown voltage - external bleed resistors are required if rapid discharge is needed.

What are the minimum recommended capacitors for stable operation of MAX8877EZK29+T?

For stable operation, MAX8877EZK29+T requires a 1µF ceramic input capacitor (X5R/X7R, ESR < 0.2Ω) and a 1µF ceramic output capacitor (same dielectric). The BP pin requires a 0.01µF ceramic capacitor. These values ensure stability across –40°C to +85°C and up to 150mA load, per Maxim's Capacitor Selection guidelines.

How does the thermal performance of MAX8877EZK29+T compare between thin and regular SOT23 packages?

MAX8877EZK29+T in thin SOT23 has θJB = 110°C/W, while the regular SOT23 version (e.g., MAX8877EUK29-T) has θJB = 140°C/W. At 150mA and 3.0V input (2.84V output), power dissipation is 24mW - resulting in ~2.6°C junction rise above board in the thin package versus ~3.4°C in the regular package, assuming identical board layout.

Is MAX8877EZK29+T pin-compatible with the industry-standard '2982 regulators?

Yes, MAX8877EZK29+T is explicitly designed as a pin-compatible upgrade to the industry-standard '2982 family. It shares identical 5-pin SOT23 pinout (IN, GND, SHDN, BP, OUT), allowing direct replacement in existing designs while improving dropout voltage (165mV vs. typical 300mV) and reducing output noise (30µVRMS vs. >100µVRMS).