Analog Devices Inc./Maxim Integrated MAX8877EUK50+T

Overview

MAX8877EUK50+T from Maxim Integrated is a low-noise, low-dropout linear regulator with fixed 5.0V 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, it integrates reverse-battery protection and thermal shutdown.

For engineers reviewing the MAX8877EUK50+T datasheet, MAX8877EUK50+T pinout, MAX8877EUK50+T application, or MAX8877EUK50+T equivalent, key selection criteria include its SOT23-5 regular package, 5.0V ±1.4% output accuracy, 10nA logic-controlled shutdown, and compatibility with industry-standard '2982 footprint-critical for space-constrained, low-power embedded designs.

Technical Context

The MAX8877EUK50+T uses an internal P-channel MOSFET pass transistor (1.1Ω typical R_DS(ON)) enabling ultra-low quiescent current across all operating conditions-including dropout-without base-drive losses. Its error amplifier compares a 1.25V bandgap reference against feedback from an internal resistor divider tied to the OUT pin.

Noise reduction relies on a dedicated BP pin with external 0.01µF capacitor forming an 80Hz low-pass filter; PSRR is 63dB at low frequencies and rolls off above 10kHz. Thermal protection activates at +155°C with 15°C hysteresis, and current limiting holds output at ≥160mA minimum under fault conditions.

Key Specifications

Pinout & Package

MAX8877EUK50+T is housed in a 5-pin SOT23-5 regular package (JEDEC MO-178AA), with GND serving as both electrical return and thermal path. The package is RoHS-compliant and optimized for reflow soldering on standard PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS76350DBVR and MCP1700T-5002E/TT, the MAX8877EUK50+T delivers superior noise performance and integrated protection-making it optimal for battery-powered instruments and communication devices where reliability and signal integrity are non-negotiable.

Availability

MAX8877EUK50+T is available at Aetrix Electronics and suitable for cellular handsets, PCMCIA cards, hand-held instruments, and electronic planners requiring stable component supply, long-lifecycle support, and guaranteed parametric compliance across industrial temperature ranges.

Supply support for MAX8877EUK50+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 markets.

The MAX8877/MAX8878 product line was designed specifically for battery-powered portable electronics requiring ultra-low noise, low dropout, and robust fault protection-targeting applications where runtime, signal fidelity, and field reliability are critical.

FAQ

What is the output voltage tolerance of the MAX8877EUK50+T over temperature and load?

The MAX8877EUK50+T guarantees ±1.4% output voltage accuracy across -40°C to +85°C ambient temperature and 0.1mA to 120mA load current, as confirmed in the Electrical Characteristics table. This specification applies to the factory-preset 5.0V output and ensures stable logic-level compatibility for microcontrollers and interface ICs without external trimming.

Does the MAX8877EUK50+T include auto-discharge functionality during shutdown?

No, the MAX8877EUK50+T does not include auto-discharge. That feature is exclusive to the MAX8878 variant. When placed in shutdown (SHDN <0.4V), the MAX8877EUK50+T disables regulation but leaves the output floating; external discharge circuitry is required if rapid V_OUT decay is needed.

What capacitor values are required for stable operation of the MAX8877EUK50+T?

For stable operation, the MAX8877EUK50+T requires a 1µF ceramic input capacitor (C_IN) and a ≥1µF ceramic output capacitor (C_OUT) with ESR <0.2Ω. 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 the Capacitor Selection section of the datasheet.

How does the MAX8877EUK50+T achieve low quiescent current in dropout condition?

The MAX8877EUK50+T achieves 100µA quiescent current in dropout by using an internal P-channel MOSFET pass transistor that requires no gate/base drive current. Unlike PNP-based LDOs, it avoids saturation losses and maintains constant I_Q regardless of input-to-output differential-verified in the Ground Pin Current vs. Input Voltage plots.

Is the MAX8877EUK50+T pin-compatible with the industry-standard '2982 regulator?

Yes, the MAX8877EUK50+T is explicitly designed as a pin-compatible upgrade to the industry-standard '2982 regulator. Its SOT23-5 pinout matches IN, GND, SHDN, BP, and OUT assignments, enabling drop-in replacement without PCB modification-confirmed in the General Description and Pin Configuration sections.